Alabi A L I M O H Helen | University of Ibadan Nigeria (original) (raw)

Papers by Alabi A L I M O H Helen

Research paper thumbnail of Sequestration of divalent heavy metal ions from aqueous environment by adsorption using biomass-bentonite composites as potential adsorbent: Equilibrium and kinetic studies

Nano-structures & nano-objects, May 1, 2024

Research paper thumbnail of Biosorption of cadmium (II), copper (II) and lead (II) ions by citric acid modified and unmodified cocoa pod shell: Equilibrium, kinetics and thermodynamics

JOURNAL OF SCIENCE RESEARCH, 2015

Chemical modification of biosorbent is a common practice in wastewater treatment when using adsor... more Chemical modification of biosorbent is a common practice in wastewater treatment when using adsorption technology.Thioglycollic acid has been used for the modification of cocoa pod without any significant improvement in its adsorptioncapacity for lead, cadmium and copper. This study is aimed at improving the sorption of these metal ions from aqueoussolution using citric acid as the modifying agent for cocoa pod shell. The dried cocoa pod shell was ground and reactedwith citric acid according to the method in the literature. Batch adsorption studies were conducted to examine theinfluence of pH, temperature, initial metal ion concentration; sorbent dose and contact time on the biosorption of Pb2+,Cu2+and Cd2+ions by modified and unmodified cocoa pod shell. Langmuir, Freundlich, Temkin and Dubinin-Radushkevichmodels were used for fitting the equilibrium data. The amount of metal ion sorbed was determined using flame atomicabsorption spectrophotometer (FAAS). The result for the adsorption of the metal ions under varying pH showed thatsorption was pH dependent. The trend in biosorption was in the order of Cd2+> Cu2+> Pb2+ on unmodified cocoa pod shell(UCPS); while the trend in biosorption of the ions onto modified cocoa pod shell (MCPS) was in the order ofPb2+> Cu2+> Cd2+. The amount of Pb2+adsorbed increased from 4.62-33.56 mg/g after modification as shown by valuesobtained using the Langmuir equation to fit the biosorption data. Langmuir isotherm gave R2values which shows that itsatisfactorily describe the biosorption process for Pb2+, Cu2+and Cd2+ions on UCPS and MCPS. The kinetics of thesorption process was best described by the pseudo-second order kinetic model (R2>0.9922). Thermodynamic parametersshowed that biosorption process was feasible and spontaneous for Pb2+, Cu2+and Cd2+ions onto UCPS and MCPS. Theprocess is exothermic for Cu2+and Cd2+ions; but endothermic for Pb2+. This study has shown that citric acid modifiedcocoa pod shell is a good biosorbent especially for Pb2+ions.

Research paper thumbnail of Adsorption of methylene blue dye from simulated wastewater onto modified and unmodified cassis fistula pods: kinetics, thermodynamics and equilibrium studies

This study compares the adsorptive capacity of unmodified, modified, and carbonized Cassia fistul... more This study compares the adsorptive capacity of unmodified, modified, and carbonized Cassia fistula pod with a view to develop low cost effective adsorbent for the remover of methylene blue (MB) dye in aqueous solution. In lieu of this, thermodynamic studies, kinetics and adsorption isotherms were explored. The adsorbents were characterized by FTIR and SEM analysis before and after the adsorption of methylene blue (MB). None of the samples conformed to the pseudo-first-2 order reaction. The R values (range 0.816-0.987) of pseudo-second-order reaction for all the adsorbents indicates their 2 conformity to pseudo-second-order reaction. The Langmuir coefficient factor (R) values for all the adsorbents are between 0.223-0.429, therefore, the data did not conform to the model. Both unmodified and oxalic treated cassia fistula do not conform to Freundlich model, there was fair conformity with the carbonized cassia fistula while the EDTA treated cassia 2 fistula conformed strongly as the R value was close to unity at 0.864. The value of standard enthalpy (? Ho) for unmodified and EDTA-treated adsorbent are 45.5 KJ/mol and 50.7 KJ/mol respectively indicating MB adsorption onto them is a chemisorption process while that of carbonized and oxalic treated are 38.33 KJ/mol and 9.75 KJ/mol respectively indicating a physio-sorption process. All adsorption reactions are endothermic in nature and consistent with temperature effect.

Research paper thumbnail of Adsorption of Organic Dyes by Carbonized and Chemically Activated Cassia Fistula Pods

Journal of Materials & Environmental Sustainability Research

The kinetics and mechanism of methylene blue and Congo red adsorption by carbonized and chemical ... more The kinetics and mechanism of methylene blue and Congo red adsorption by carbonized and chemical activated Cassia fistula was investigated for various physicochemical parameters in a batch system. The adsorbents were characterized using Fourier Transform Infrared Spectroscopy (FTIR), Scanning Electron Microscope (SEM), and Energy Dispersive X-Ray (EDX). The results showed that the adsorbents were rich in carbon content and heterogeneous large surface area for organic dye interaction. T understand the adsorption process, the equilibrium data was tested using Langmuir, Freundlich, Temkin and Brunauer-Emmett-Teller (BET) adsorption isotherms. The good physisorption adsorption process is indicated by the Freundlich constant, n>1. Furthermore, -0.0188, 0.0007, and 0.6990 for methylene blue; -0.0692, 0.0001 and 0.3856 for Congo red were obtained for ∆G0, ∆H0 and ∆S0 thermodynamics parameters, respectively. Results from BET study revealed efficient dye adsorption and chemical activation...

Research paper thumbnail of Biosorption of Phosphate Ion on Albizia Lebbeck Seed Pod with and Without Organic Acid Modification

Journal of Applied Sciences and Environmental Management, 2018

This study uses batch experiment to compare the binding efficiency of phosphate onto Albizia lebb... more This study uses batch experiment to compare the binding efficiency of phosphate onto Albizia lebbeck (ALB) pod with and without citric acid (CALB) or tartaric acid (TALB) modification. The residual phosphate concentration was analyzed using ascorbic acid method and the generated data were fitted into equilibrium isotherms and kinetics models. Intra-particle diffusion model was used to describe the biosorption mechanism. Characterization by FTIR spectroscopy and SEM shows that modification was successful. The maximum biosorption capacity occurred at biosorbent dosage of 0.5 g for ALB and 1.0 g for CALB and TALB. At optimum pH for each biosorbents, phosphate biosorption capacity is in the order ALB>CALB>TALB. Equilibrium time of 90, 150 and 60 minutes were recorded for phosphate on ALB, CALB and TALB respectively. The biosorption capacity increases as the initial anion concentration increases with highest biosorption capacity of 5.296 mg/g for ALB. Langmuir isotherm describes CALB data while TALB data fits Freundlich. Results from this study suggest that unmodified Albizia lebbeck can be used as a low-cost, highly-efficient biosorbent for phosphate removal in effluents.

Research paper thumbnail of International Journal of Industrial Chemistry (IJIC)-Springer-Elect. Sup. Info.-2 Jan., 2017

Research paper thumbnail of Equilibrium, Kinetic and Thermodynamic Studies of Biosorption of Methylene Blue on Goethite Modified Baobab Fruit Pod (Adansonia Digitata L.)

Journal of Applied Sciences and Environmental Management, 2020

Methylene Blue (MB) was adsorbed from aqueous solution using Baobab (Adansonia digitata L.) fruit... more Methylene Blue (MB) was adsorbed from aqueous solution using Baobab (Adansonia digitata L.) fruit pod and its goethite modified form. Adsorbents were characterized using Fourier Transform-Infra Red (FTIR) spectroscopy and Scanning Electron Microscopy (SEM). Batch experiments were conducted at room temperature (26.8 °C) and the adsorption data were fitted using Langmuir, Freundlich, Temkin and Dubinin- Radushkevich isotherms. Also, kinetic data was fitted using Pseudo-first order, pseudo-second order, Elovich and intra-particle diffusion models. Goethite modified baobab (GMB) appeared to have a coarse microporous surface with smoother surface and larger pore volumes compared to unmodified baobab (UB). The –C=O band was observed at 1631 and 1636 cm-1 for UB and GMB. The –OH band was observed at 3447.00 cm-1 and 3442 cm-1 for UB andGMB respectively. Langmuir model was suitable for describing the adsorption data of UB with R2 of 0.9293 while Temkin model was best for fitting adsorption ...

Research paper thumbnail of Biosorption of cadmium (II), copper (II) and lead (II) ions by citric acid modified and unmodified cocoa pod shell: Equilibrium, kinetics and thermodynamics

JOURNAL OF SCIENCE RESEARCH, 2015

Chemical modification of biosorbent is a common practice in wastewater treatment when using adsor... more Chemical modification of biosorbent is a common practice in wastewater treatment when using adsorption technology.Thioglycollic acid has been used for the modification of cocoa pod without any significant improvement in its adsorptioncapacity for lead, cadmium and copper. This study is aimed at improving the sorption of these metal ions from aqueoussolution using citric acid as the modifying agent for cocoa pod shell. The dried cocoa pod shell was ground and reactedwith citric acid according to the method in the literature. Batch adsorption studies were conducted to examine theinfluence of pH, temperature, initial metal ion concentration; sorbent dose and contact time on the biosorption of Pb2+,Cu2+and Cd2+ions by modified and unmodified cocoa pod shell. Langmuir, Freundlich, Temkin and Dubinin-Radushkevichmodels were used for fitting the equilibrium data. The amount of metal ion sorbed was determined using flame atomicabsorption spectrophotometer (FAAS). The result for the adsorption of the metal ions under varying pH showed thatsorption was pH dependent. The trend in biosorption was in the order of Cd2+> Cu2+> Pb2+ on unmodified cocoa pod shell(UCPS); while the trend in biosorption of the ions onto modified cocoa pod shell (MCPS) was in the order ofPb2+> Cu2+> Cd2+. The amount of Pb2+adsorbed increased from 4.62-33.56 mg/g after modification as shown by valuesobtained using the Langmuir equation to fit the biosorption data. Langmuir isotherm gave R2values which shows that itsatisfactorily describe the biosorption process for Pb2+, Cu2+and Cd2+ions on UCPS and MCPS. The kinetics of thesorption process was best described by the pseudo-second order kinetic model (R2>0.9922). Thermodynamic parametersshowed that biosorption process was feasible and spontaneous for Pb2+, Cu2+and Cd2+ions onto UCPS and MCPS. Theprocess is exothermic for Cu2+and Cd2+ions; but endothermic for Pb2+. This study has shown that citric acid modifiedcocoa pod shell is a good biosorbent especially for Pb2+ions.

Research paper thumbnail of Adsorption efficacy of Cedrela odorata seed waste for dyes: Non linear fractal kinetics and non linear equilibrium studies

Journal of Environmental Chemical Engineering, 2016

Abstract Alteration of the structural and functional integrity of the aquatic ecosystems due to c... more Abstract Alteration of the structural and functional integrity of the aquatic ecosystems due to contamination from toxic industrial dyes warrants cost effective remedial strategies. Cedrela odorata Seed Chaff (COSC) was locally sourced, indigenous and ubiquitous. In support of this proposition, the efficacy of the COSC was assessed for the adsorption of some toxic industrial dyes, namely Methylene Blue (MB), Congo Red (CR), Methyl Violet (MV) and Methyl Orange (MO) from aqueous solutions. The microstructures of Cedrela odorata Seed Chaff (COSC) were carried out using pH of Point of Zero Charge (PZC), Specific Surface Area (SSA), Bulk Density (BD), Fourier Transform Infra Red Spectroscopy (FTIR), X-Ray Diffraction (XRD), Thermogravimetric Analysis (TGA) and Scanning Electron Microscopy (SEM) which indicated that various organic moieties were present in COSC, which the toxic industrial dyes studied were adsorbed onto. Non linear equilibrium and non linear fractal models were used to fit experimental data. The experimental data best fit the Fritz-Schlunder four-parameter isotherm and the fractal-like pseudo-second order (three-parameter) kinetic equation. The Langmuir monolayer adsorption capacities, q max L of COSC for the uptake of MB, CR, MV and MO were 88.32–111.88 mg/g, 79.46–128.84 mg/g, 75.11–121.23 mg/g and 57.35–68.23 mg/g respectively as temperature increased from 298 to 318 K. The results support the use of Cedrela odorata Seed Chaff (COSC) as a cost effective material for removal of toxic industrial dye from an aquatic system. Large scale studies are required in the future to prove the efficacy of Cedrela odorata Seed Chaff (COSC) for toxic industrial dyes from varied environmental conditions.

Research paper thumbnail of Biosorption of cadmium (II), copper (II) and lead (II) ions by citric acid modified and unmodified cocoa pod shell: Equilibrium, kinetics and thermodynamics

JOURNAL OF SCIENCE RESEARCH, 2015

Chemical modification of biosorbent is a common practice in wastewater treatment when using adsor... more Chemical modification of biosorbent is a common practice in wastewater treatment when using adsorption technology. Thioglycollic acid has been used for the modification of cocoa pod without any significant improvement in its adsorption capacity for lead, cadmium and copper. This study is aimed at improving the sorption of these metal ions from aqueous solution using citric acid as the modifying agent for cocoa pod shell. The dried cocoa pod shell was ground and reacted with citric acid according to the method in the literature. Batch adsorption studies were conducted to examine the influence of pH, temperature, initial metal ion concentration; sorbent dose and contact time on the biosorption of Pb 2+ , Cu 2+ and Cd 2+ ions by modified and unmodified cocoa pod shell. Langmuir, Freundlich, Temkin and Dubinin-Radushkevich models were used for fitting the equilibrium data. The amount of metal ion sorbed was determined using flame atomic absorption spectrophotometer (FAAS). The result for the adsorption of the metal ions under varying pH showed that sorption was pH dependent. The trend in biosorption was in the order of Cd 2 > Cu 2+ > Pb 2+ on unmodified cocoa pod shell (UCPS); while the trend in biosorption of the ions onto modified cocoa pod shell (MCPS) was in the order of Pb 2+ > Cu 2+ > Cd 2+. The amount of Pb 2+ adsorbed increased from 4.62-33.56 mg/g after modification as show by values obtained using the Langmuir equation to fit the biosorption data. Langmuir isotherm gave R 2 values which shows that it satisfactorily describe the biosorption process for Pb 2+ , Cu 2+ and Cd 2+ ions on UCPS and MCPS. The kinetics of the sorption process was best described by the pseudo second-order kinetic model (R 2 >0.9922). Thermodynamic parameters showed that biosorption process was feasible and spontaneous for Pb 2+ , Cu 2+ and Cd 2+ ions onto UCPS and MCPS. The process is exothermic for Cu 2+ and Cd 2+ ions; but endothermic for Pb 2+. This study has shown that citric acid modified cocoa pod shell is a good biosorbent especially for Pb 2+ ions.

Research paper thumbnail of Biosorption of Phenols and Dyes on Albizia lebbeck (Rattle Seed) Pod: Equilibrium and Kinetic Studies

Introduction One of the major problems of the industrial waste is the great amount of wastewater ... more Introduction One of the major problems of the industrial waste is the great amount of wastewater produced and the high investment needed for the treatment of this effluent before it is released in the environment. Pollution of water is a major environmental problem. The self-purification capacity of surface water and changes in the availability of food; have been extremely threatened by industrial effluents which are major sources of pollutants in the aquatic ecosystems (Udiba et al., 2014). Modern industry is to a large extent responsible for the contamination of the environment. Lakes, rivers and oceans are being overwhelmed with bacteria and waste matter. Among toxic substances reaching hazardous levels are heavy metals and organic pollutants (Vieira and Volesky, 2000). Wastewater and effluents from industries such as paint, pesticides, coal conversion, petrochemicals, textiles, petroleum and phenolic resin industries are major sources of phenols and dyes in aquatic environment (...

Research paper thumbnail of Biosorption of Phenols and Dyes on Albizia lebbeck (Rattle Seed) Pod: Equilibrium and Kinetic Studies

Introduction One of the major problems of the industrial waste is the great amount of wastewater ... more Introduction One of the major problems of the industrial waste is the great amount of wastewater produced and the high investment needed for the treatment of this effluent before it is released in the environment. Pollution of water is a major environmental problem. The self-purification capacity of surface water and changes in the availability of food; have been extremely threatened by industrial effluents which are major sources of pollutants in the aquatic ecosystems (Udiba et al., 2014). Modern industry is to a large extent responsible for the contamination of the environment. Lakes, rivers and oceans are being overwhelmed with bacteria and waste matter. Among toxic substances reaching hazardous levels are heavy metals and organic pollutants (Vieira and Volesky, 2000). Wastewater and effluents from industries such as paint, pesticides, coal conversion, petrochemicals, textiles, petroleum and phenolic resin industries are major sources of phenols and dyes in aquatic environment (...

Research paper thumbnail of Fractal-like concepts for evaluation of toxic metals adsorption efficiency of feldspar-biomass composites

Journal of Cleaner Production

Research paper thumbnail of Adsorptive removal of 2,4,6-trichlorophenol in aqueous solution using calcined kaolinite-biomass composites

Journal of Environmental Management, 2017

Synergistically combined low-cost composites may be effective for the potential treatment of effl... more Synergistically combined low-cost composites may be effective for the potential treatment of effluents containing organic pollutants. Hence, preparation of Carica-papaya-modified-kaolinite (CPK) and pine-cone-modified-kaolinite (PCK) composites via calcination of pure kaolinite (KAC), Carica-papaya and pine-cone seeds is demonstrated. The composites' specific surface areas were reduced by more than 57% but no structural modification in KAC lattice d-spacing, indicating impregnation of calcined biomass on clay surfaces and pores. However, composites' cation exchange capacities were enhanced over 4-fold, indicating higher potential for adsorption. Adsorption of 2,4,6-trichlorophenol on composites and KAC showed that CPK and PCK attained equilibrium relatively faster (30 min) compared to KAC (60 min). Modeling studies showed that 2,4,6-trichlorophenol removal mechanisms involved electrostatic interactions on sites of similar energy. Modification enhanced adsorption by 52 and 250% in PCK and CPK, respectively, and adsorption increased with temperature.

Research paper thumbnail of Adsorption and desorption kinetics of toxic organic and inorganic ions using an indigenous biomass: Terminalia ivorensis seed waste

International Journal of Industrial Chemistry, 2016

Omorogie, M. (2017). Adsorption and desorption kinetics of toxic organic and inorganic ions using... more Omorogie, M. (2017). Adsorption and desorption kinetics of toxic organic and inorganic ions using an indigenous biomass: Terminalia ivorensis seed waste.

Research paper thumbnail of Calcined Biomass-Modified Bentonite Clay for Removal of Aqueous Metal Ions

Journal of Environmental Chemical Engineering, 2016

Recent studies have shown that kaolinite clay modified with biosorbents are promising low cost ad... more Recent studies have shown that kaolinite clay modified with biosorbents are promising low cost adsorbents for the removal of metals from aqueous solution because the resultant composites have higher adsorption capacities, and hence a better aqueous metal ions removal efficiencies. However, some clay properties suggest that not all such modifications enhance adsorption capacity. In this study, bentonite (BEN) clay was calcined after modification with Carica papaya seeds or pine cone to obtain C. papaya-modified bentonite (CPB) and pine cone-modified bentonite (PCB). The efficiencies of these adsorbents for the removal of Pb(II), Cu(II) and Cd(II) ions from aqueous solutions were studied as a function of pH, time, sorbate concentration and temperature. X-ray diffraction results showed that CPB and PCB had lattice structure as BEN, but reductions in the surface areas of CPB and PCB were observed. Adsorption results showed that pH did not significantly affect removal of aqueous metal ions between pH 3 and 7. The adsorption fitted pseudo-second order (r 2 ! 0.966) and intra-particle diffusion models and indicated mainly surface phenomena involving sharing of electrons between the adsorbent surfaces and the metal ion species. Unlike Cu(II) and Cd(II), Pb(II) adsorption reduced in CPB and PCB indicating that not all calcined biomass-clay composites have enhanced aqueous metal adsorption efficiency. However, undesired properties such as adsorbent bleeding were removed and mechanical strength enhanced while easier separation of the adsorbents from solution as compared to the raw bentonite was observed.

Research paper thumbnail of Sequestration of divalent heavy metal ions from aqueous environment by adsorption using biomass-bentonite composites as potential adsorbent: Equilibrium and kinetic studies

Nano-structures & nano-objects, May 1, 2024

Research paper thumbnail of Biosorption of cadmium (II), copper (II) and lead (II) ions by citric acid modified and unmodified cocoa pod shell: Equilibrium, kinetics and thermodynamics

JOURNAL OF SCIENCE RESEARCH, 2015

Chemical modification of biosorbent is a common practice in wastewater treatment when using adsor... more Chemical modification of biosorbent is a common practice in wastewater treatment when using adsorption technology.Thioglycollic acid has been used for the modification of cocoa pod without any significant improvement in its adsorptioncapacity for lead, cadmium and copper. This study is aimed at improving the sorption of these metal ions from aqueoussolution using citric acid as the modifying agent for cocoa pod shell. The dried cocoa pod shell was ground and reactedwith citric acid according to the method in the literature. Batch adsorption studies were conducted to examine theinfluence of pH, temperature, initial metal ion concentration; sorbent dose and contact time on the biosorption of Pb2+,Cu2+and Cd2+ions by modified and unmodified cocoa pod shell. Langmuir, Freundlich, Temkin and Dubinin-Radushkevichmodels were used for fitting the equilibrium data. The amount of metal ion sorbed was determined using flame atomicabsorption spectrophotometer (FAAS). The result for the adsorption of the metal ions under varying pH showed thatsorption was pH dependent. The trend in biosorption was in the order of Cd2+> Cu2+> Pb2+ on unmodified cocoa pod shell(UCPS); while the trend in biosorption of the ions onto modified cocoa pod shell (MCPS) was in the order ofPb2+> Cu2+> Cd2+. The amount of Pb2+adsorbed increased from 4.62-33.56 mg/g after modification as shown by valuesobtained using the Langmuir equation to fit the biosorption data. Langmuir isotherm gave R2values which shows that itsatisfactorily describe the biosorption process for Pb2+, Cu2+and Cd2+ions on UCPS and MCPS. The kinetics of thesorption process was best described by the pseudo-second order kinetic model (R2>0.9922). Thermodynamic parametersshowed that biosorption process was feasible and spontaneous for Pb2+, Cu2+and Cd2+ions onto UCPS and MCPS. Theprocess is exothermic for Cu2+and Cd2+ions; but endothermic for Pb2+. This study has shown that citric acid modifiedcocoa pod shell is a good biosorbent especially for Pb2+ions.

Research paper thumbnail of Adsorption of methylene blue dye from simulated wastewater onto modified and unmodified cassis fistula pods: kinetics, thermodynamics and equilibrium studies

This study compares the adsorptive capacity of unmodified, modified, and carbonized Cassia fistul... more This study compares the adsorptive capacity of unmodified, modified, and carbonized Cassia fistula pod with a view to develop low cost effective adsorbent for the remover of methylene blue (MB) dye in aqueous solution. In lieu of this, thermodynamic studies, kinetics and adsorption isotherms were explored. The adsorbents were characterized by FTIR and SEM analysis before and after the adsorption of methylene blue (MB). None of the samples conformed to the pseudo-first-2 order reaction. The R values (range 0.816-0.987) of pseudo-second-order reaction for all the adsorbents indicates their 2 conformity to pseudo-second-order reaction. The Langmuir coefficient factor (R) values for all the adsorbents are between 0.223-0.429, therefore, the data did not conform to the model. Both unmodified and oxalic treated cassia fistula do not conform to Freundlich model, there was fair conformity with the carbonized cassia fistula while the EDTA treated cassia 2 fistula conformed strongly as the R value was close to unity at 0.864. The value of standard enthalpy (? Ho) for unmodified and EDTA-treated adsorbent are 45.5 KJ/mol and 50.7 KJ/mol respectively indicating MB adsorption onto them is a chemisorption process while that of carbonized and oxalic treated are 38.33 KJ/mol and 9.75 KJ/mol respectively indicating a physio-sorption process. All adsorption reactions are endothermic in nature and consistent with temperature effect.

Research paper thumbnail of Adsorption of Organic Dyes by Carbonized and Chemically Activated Cassia Fistula Pods

Journal of Materials & Environmental Sustainability Research

The kinetics and mechanism of methylene blue and Congo red adsorption by carbonized and chemical ... more The kinetics and mechanism of methylene blue and Congo red adsorption by carbonized and chemical activated Cassia fistula was investigated for various physicochemical parameters in a batch system. The adsorbents were characterized using Fourier Transform Infrared Spectroscopy (FTIR), Scanning Electron Microscope (SEM), and Energy Dispersive X-Ray (EDX). The results showed that the adsorbents were rich in carbon content and heterogeneous large surface area for organic dye interaction. T understand the adsorption process, the equilibrium data was tested using Langmuir, Freundlich, Temkin and Brunauer-Emmett-Teller (BET) adsorption isotherms. The good physisorption adsorption process is indicated by the Freundlich constant, n>1. Furthermore, -0.0188, 0.0007, and 0.6990 for methylene blue; -0.0692, 0.0001 and 0.3856 for Congo red were obtained for ∆G0, ∆H0 and ∆S0 thermodynamics parameters, respectively. Results from BET study revealed efficient dye adsorption and chemical activation...

Research paper thumbnail of Biosorption of Phosphate Ion on Albizia Lebbeck Seed Pod with and Without Organic Acid Modification

Journal of Applied Sciences and Environmental Management, 2018

This study uses batch experiment to compare the binding efficiency of phosphate onto Albizia lebb... more This study uses batch experiment to compare the binding efficiency of phosphate onto Albizia lebbeck (ALB) pod with and without citric acid (CALB) or tartaric acid (TALB) modification. The residual phosphate concentration was analyzed using ascorbic acid method and the generated data were fitted into equilibrium isotherms and kinetics models. Intra-particle diffusion model was used to describe the biosorption mechanism. Characterization by FTIR spectroscopy and SEM shows that modification was successful. The maximum biosorption capacity occurred at biosorbent dosage of 0.5 g for ALB and 1.0 g for CALB and TALB. At optimum pH for each biosorbents, phosphate biosorption capacity is in the order ALB>CALB>TALB. Equilibrium time of 90, 150 and 60 minutes were recorded for phosphate on ALB, CALB and TALB respectively. The biosorption capacity increases as the initial anion concentration increases with highest biosorption capacity of 5.296 mg/g for ALB. Langmuir isotherm describes CALB data while TALB data fits Freundlich. Results from this study suggest that unmodified Albizia lebbeck can be used as a low-cost, highly-efficient biosorbent for phosphate removal in effluents.

Research paper thumbnail of International Journal of Industrial Chemistry (IJIC)-Springer-Elect. Sup. Info.-2 Jan., 2017

Research paper thumbnail of Equilibrium, Kinetic and Thermodynamic Studies of Biosorption of Methylene Blue on Goethite Modified Baobab Fruit Pod (Adansonia Digitata L.)

Journal of Applied Sciences and Environmental Management, 2020

Methylene Blue (MB) was adsorbed from aqueous solution using Baobab (Adansonia digitata L.) fruit... more Methylene Blue (MB) was adsorbed from aqueous solution using Baobab (Adansonia digitata L.) fruit pod and its goethite modified form. Adsorbents were characterized using Fourier Transform-Infra Red (FTIR) spectroscopy and Scanning Electron Microscopy (SEM). Batch experiments were conducted at room temperature (26.8 °C) and the adsorption data were fitted using Langmuir, Freundlich, Temkin and Dubinin- Radushkevich isotherms. Also, kinetic data was fitted using Pseudo-first order, pseudo-second order, Elovich and intra-particle diffusion models. Goethite modified baobab (GMB) appeared to have a coarse microporous surface with smoother surface and larger pore volumes compared to unmodified baobab (UB). The –C=O band was observed at 1631 and 1636 cm-1 for UB and GMB. The –OH band was observed at 3447.00 cm-1 and 3442 cm-1 for UB andGMB respectively. Langmuir model was suitable for describing the adsorption data of UB with R2 of 0.9293 while Temkin model was best for fitting adsorption ...

Research paper thumbnail of Biosorption of cadmium (II), copper (II) and lead (II) ions by citric acid modified and unmodified cocoa pod shell: Equilibrium, kinetics and thermodynamics

JOURNAL OF SCIENCE RESEARCH, 2015

Chemical modification of biosorbent is a common practice in wastewater treatment when using adsor... more Chemical modification of biosorbent is a common practice in wastewater treatment when using adsorption technology.Thioglycollic acid has been used for the modification of cocoa pod without any significant improvement in its adsorptioncapacity for lead, cadmium and copper. This study is aimed at improving the sorption of these metal ions from aqueoussolution using citric acid as the modifying agent for cocoa pod shell. The dried cocoa pod shell was ground and reactedwith citric acid according to the method in the literature. Batch adsorption studies were conducted to examine theinfluence of pH, temperature, initial metal ion concentration; sorbent dose and contact time on the biosorption of Pb2+,Cu2+and Cd2+ions by modified and unmodified cocoa pod shell. Langmuir, Freundlich, Temkin and Dubinin-Radushkevichmodels were used for fitting the equilibrium data. The amount of metal ion sorbed was determined using flame atomicabsorption spectrophotometer (FAAS). The result for the adsorption of the metal ions under varying pH showed thatsorption was pH dependent. The trend in biosorption was in the order of Cd2+> Cu2+> Pb2+ on unmodified cocoa pod shell(UCPS); while the trend in biosorption of the ions onto modified cocoa pod shell (MCPS) was in the order ofPb2+> Cu2+> Cd2+. The amount of Pb2+adsorbed increased from 4.62-33.56 mg/g after modification as shown by valuesobtained using the Langmuir equation to fit the biosorption data. Langmuir isotherm gave R2values which shows that itsatisfactorily describe the biosorption process for Pb2+, Cu2+and Cd2+ions on UCPS and MCPS. The kinetics of thesorption process was best described by the pseudo-second order kinetic model (R2>0.9922). Thermodynamic parametersshowed that biosorption process was feasible and spontaneous for Pb2+, Cu2+and Cd2+ions onto UCPS and MCPS. Theprocess is exothermic for Cu2+and Cd2+ions; but endothermic for Pb2+. This study has shown that citric acid modifiedcocoa pod shell is a good biosorbent especially for Pb2+ions.

Research paper thumbnail of Adsorption efficacy of Cedrela odorata seed waste for dyes: Non linear fractal kinetics and non linear equilibrium studies

Journal of Environmental Chemical Engineering, 2016

Abstract Alteration of the structural and functional integrity of the aquatic ecosystems due to c... more Abstract Alteration of the structural and functional integrity of the aquatic ecosystems due to contamination from toxic industrial dyes warrants cost effective remedial strategies. Cedrela odorata Seed Chaff (COSC) was locally sourced, indigenous and ubiquitous. In support of this proposition, the efficacy of the COSC was assessed for the adsorption of some toxic industrial dyes, namely Methylene Blue (MB), Congo Red (CR), Methyl Violet (MV) and Methyl Orange (MO) from aqueous solutions. The microstructures of Cedrela odorata Seed Chaff (COSC) were carried out using pH of Point of Zero Charge (PZC), Specific Surface Area (SSA), Bulk Density (BD), Fourier Transform Infra Red Spectroscopy (FTIR), X-Ray Diffraction (XRD), Thermogravimetric Analysis (TGA) and Scanning Electron Microscopy (SEM) which indicated that various organic moieties were present in COSC, which the toxic industrial dyes studied were adsorbed onto. Non linear equilibrium and non linear fractal models were used to fit experimental data. The experimental data best fit the Fritz-Schlunder four-parameter isotherm and the fractal-like pseudo-second order (three-parameter) kinetic equation. The Langmuir monolayer adsorption capacities, q max L of COSC for the uptake of MB, CR, MV and MO were 88.32–111.88 mg/g, 79.46–128.84 mg/g, 75.11–121.23 mg/g and 57.35–68.23 mg/g respectively as temperature increased from 298 to 318 K. The results support the use of Cedrela odorata Seed Chaff (COSC) as a cost effective material for removal of toxic industrial dye from an aquatic system. Large scale studies are required in the future to prove the efficacy of Cedrela odorata Seed Chaff (COSC) for toxic industrial dyes from varied environmental conditions.

Research paper thumbnail of Biosorption of cadmium (II), copper (II) and lead (II) ions by citric acid modified and unmodified cocoa pod shell: Equilibrium, kinetics and thermodynamics

JOURNAL OF SCIENCE RESEARCH, 2015

Chemical modification of biosorbent is a common practice in wastewater treatment when using adsor... more Chemical modification of biosorbent is a common practice in wastewater treatment when using adsorption technology. Thioglycollic acid has been used for the modification of cocoa pod without any significant improvement in its adsorption capacity for lead, cadmium and copper. This study is aimed at improving the sorption of these metal ions from aqueous solution using citric acid as the modifying agent for cocoa pod shell. The dried cocoa pod shell was ground and reacted with citric acid according to the method in the literature. Batch adsorption studies were conducted to examine the influence of pH, temperature, initial metal ion concentration; sorbent dose and contact time on the biosorption of Pb 2+ , Cu 2+ and Cd 2+ ions by modified and unmodified cocoa pod shell. Langmuir, Freundlich, Temkin and Dubinin-Radushkevich models were used for fitting the equilibrium data. The amount of metal ion sorbed was determined using flame atomic absorption spectrophotometer (FAAS). The result for the adsorption of the metal ions under varying pH showed that sorption was pH dependent. The trend in biosorption was in the order of Cd 2 > Cu 2+ > Pb 2+ on unmodified cocoa pod shell (UCPS); while the trend in biosorption of the ions onto modified cocoa pod shell (MCPS) was in the order of Pb 2+ > Cu 2+ > Cd 2+. The amount of Pb 2+ adsorbed increased from 4.62-33.56 mg/g after modification as show by values obtained using the Langmuir equation to fit the biosorption data. Langmuir isotherm gave R 2 values which shows that it satisfactorily describe the biosorption process for Pb 2+ , Cu 2+ and Cd 2+ ions on UCPS and MCPS. The kinetics of the sorption process was best described by the pseudo second-order kinetic model (R 2 >0.9922). Thermodynamic parameters showed that biosorption process was feasible and spontaneous for Pb 2+ , Cu 2+ and Cd 2+ ions onto UCPS and MCPS. The process is exothermic for Cu 2+ and Cd 2+ ions; but endothermic for Pb 2+. This study has shown that citric acid modified cocoa pod shell is a good biosorbent especially for Pb 2+ ions.

Research paper thumbnail of Biosorption of Phenols and Dyes on Albizia lebbeck (Rattle Seed) Pod: Equilibrium and Kinetic Studies

Introduction One of the major problems of the industrial waste is the great amount of wastewater ... more Introduction One of the major problems of the industrial waste is the great amount of wastewater produced and the high investment needed for the treatment of this effluent before it is released in the environment. Pollution of water is a major environmental problem. The self-purification capacity of surface water and changes in the availability of food; have been extremely threatened by industrial effluents which are major sources of pollutants in the aquatic ecosystems (Udiba et al., 2014). Modern industry is to a large extent responsible for the contamination of the environment. Lakes, rivers and oceans are being overwhelmed with bacteria and waste matter. Among toxic substances reaching hazardous levels are heavy metals and organic pollutants (Vieira and Volesky, 2000). Wastewater and effluents from industries such as paint, pesticides, coal conversion, petrochemicals, textiles, petroleum and phenolic resin industries are major sources of phenols and dyes in aquatic environment (...

Research paper thumbnail of Biosorption of Phenols and Dyes on Albizia lebbeck (Rattle Seed) Pod: Equilibrium and Kinetic Studies

Introduction One of the major problems of the industrial waste is the great amount of wastewater ... more Introduction One of the major problems of the industrial waste is the great amount of wastewater produced and the high investment needed for the treatment of this effluent before it is released in the environment. Pollution of water is a major environmental problem. The self-purification capacity of surface water and changes in the availability of food; have been extremely threatened by industrial effluents which are major sources of pollutants in the aquatic ecosystems (Udiba et al., 2014). Modern industry is to a large extent responsible for the contamination of the environment. Lakes, rivers and oceans are being overwhelmed with bacteria and waste matter. Among toxic substances reaching hazardous levels are heavy metals and organic pollutants (Vieira and Volesky, 2000). Wastewater and effluents from industries such as paint, pesticides, coal conversion, petrochemicals, textiles, petroleum and phenolic resin industries are major sources of phenols and dyes in aquatic environment (...

Research paper thumbnail of Fractal-like concepts for evaluation of toxic metals adsorption efficiency of feldspar-biomass composites

Journal of Cleaner Production

Research paper thumbnail of Adsorptive removal of 2,4,6-trichlorophenol in aqueous solution using calcined kaolinite-biomass composites

Journal of Environmental Management, 2017

Synergistically combined low-cost composites may be effective for the potential treatment of effl... more Synergistically combined low-cost composites may be effective for the potential treatment of effluents containing organic pollutants. Hence, preparation of Carica-papaya-modified-kaolinite (CPK) and pine-cone-modified-kaolinite (PCK) composites via calcination of pure kaolinite (KAC), Carica-papaya and pine-cone seeds is demonstrated. The composites' specific surface areas were reduced by more than 57% but no structural modification in KAC lattice d-spacing, indicating impregnation of calcined biomass on clay surfaces and pores. However, composites' cation exchange capacities were enhanced over 4-fold, indicating higher potential for adsorption. Adsorption of 2,4,6-trichlorophenol on composites and KAC showed that CPK and PCK attained equilibrium relatively faster (30 min) compared to KAC (60 min). Modeling studies showed that 2,4,6-trichlorophenol removal mechanisms involved electrostatic interactions on sites of similar energy. Modification enhanced adsorption by 52 and 250% in PCK and CPK, respectively, and adsorption increased with temperature.

Research paper thumbnail of Adsorption and desorption kinetics of toxic organic and inorganic ions using an indigenous biomass: Terminalia ivorensis seed waste

International Journal of Industrial Chemistry, 2016

Omorogie, M. (2017). Adsorption and desorption kinetics of toxic organic and inorganic ions using... more Omorogie, M. (2017). Adsorption and desorption kinetics of toxic organic and inorganic ions using an indigenous biomass: Terminalia ivorensis seed waste.

Research paper thumbnail of Calcined Biomass-Modified Bentonite Clay for Removal of Aqueous Metal Ions

Journal of Environmental Chemical Engineering, 2016

Recent studies have shown that kaolinite clay modified with biosorbents are promising low cost ad... more Recent studies have shown that kaolinite clay modified with biosorbents are promising low cost adsorbents for the removal of metals from aqueous solution because the resultant composites have higher adsorption capacities, and hence a better aqueous metal ions removal efficiencies. However, some clay properties suggest that not all such modifications enhance adsorption capacity. In this study, bentonite (BEN) clay was calcined after modification with Carica papaya seeds or pine cone to obtain C. papaya-modified bentonite (CPB) and pine cone-modified bentonite (PCB). The efficiencies of these adsorbents for the removal of Pb(II), Cu(II) and Cd(II) ions from aqueous solutions were studied as a function of pH, time, sorbate concentration and temperature. X-ray diffraction results showed that CPB and PCB had lattice structure as BEN, but reductions in the surface areas of CPB and PCB were observed. Adsorption results showed that pH did not significantly affect removal of aqueous metal ions between pH 3 and 7. The adsorption fitted pseudo-second order (r 2 ! 0.966) and intra-particle diffusion models and indicated mainly surface phenomena involving sharing of electrons between the adsorbent surfaces and the metal ion species. Unlike Cu(II) and Cd(II), Pb(II) adsorption reduced in CPB and PCB indicating that not all calcined biomass-clay composites have enhanced aqueous metal adsorption efficiency. However, undesired properties such as adsorbent bleeding were removed and mechanical strength enhanced while easier separation of the adsorbents from solution as compared to the raw bentonite was observed.