Peganum Harmala plant as an adsorbent for the removal of Copper(II) ions from water (original) (raw)
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Journal of Hazardous Materials, 2005
Adsorption of copper ions onto Capsicum annuum (red pepper) seeds was investigated with the variation in the parameters of pH, contact time, adsorbent and copper(II) concentrations and temperature. The nature of the possible adsorbent and metal ion interactions was examined by the FTIR technique. The copper(II) adsorption equilibrium was attained within 60 min. Adsorption of copper(II) ions onto C. annuum seeds followed by the Langmuir, Freundlich and Dubinin-Radushkevich (D-R) isotherm models. Maximum adsorption capacity (q max ) of copper(II) ions onto red pepper seeds was 4.47 × 10 −4 mol g −1 at 50 • C. Three kinetic models including the pseudo-first-order, pseudo-second-order and intraparticle diffusion equations were selected to follow the adsorption process. Kinetic parameters such as rate constants, equilibrium adsorption capacities and related correlation coefficients, for each kinetic model were calculated and discussed. It was indicated that the adsorption of copper(II) ions onto C. annuum seeds could be described by the pseudo-second-order kinetic model and also followed the intraparticle diffusion model up to 60 min, but diffusion is not only the rate controlling step. Thermodynamics parameters such as the change of free energy, enthalpy and entropy were also evaluated for the adsorption of copper(II) ions onto C. annuum seeds.
Adsorption of copper (II) ions onto raw Globimetula oreophila (Afomo ori koko) leaves
African Journal of Biotechnology, 2021
This study examined the adsorption of copper onto raw Globimetula oreophila leaves. The adsorbent surface nature was examined using scanning electron microscopy and Fourier transform infrared spectroscopy. Adsorption parameters such as the –log10[H+], point of zero charge, initial metal concentration, mass of biomass and contact time were determined. Copper adsorption decreased gradually with pH. The point of zero charge (PZC) obtained was 4.5. The percentage adsorption capacity increased from 97.6 to 99.3% as the initial amount of copper rose from 20 to 100 mg/L. Temkin isotherm gave the best fit (R2=0.99) in describing the adsorption equilibrium process. Contact time effect resulted in an equilibrium attained in 15 min due to the initial rapid increase in adsorption. Kinetic data were excellently fitted to the pseudo-second order model. Thermodynamic studies affirmed a spontaneous and endothermic adsorption process. The activation energy and the energy of adsorption obtained affir...
Removal of Copper from Simulated Wastewater Using Pongamia Pinnata Seed Shell as Adsorbent
The adsorption process is being widely used by various researchers for the removal of toxic metals from waste streams and activated carbon has been frequently used as an adsorbent. Despite its extensive use in the water and wastewater treatment industries, activated carbon remains an expensive material. In recent years, the need for safe and economical methods for the elimination of toxic metals from contaminated waters has necessitated research interest towards the production of low cost alternatives to commercially available activated carbon. Presence of copper in the water used for various activities affects living beings in its own way depending on its concentration. Considering the effects of high dose of copper concentration on humans and animals, it is important to remove this metal ion from industrial effluent before discharge to environmental stream. In this regard Pongamia pinnata seed shell is proven to be an effective and promising adsorbent. Removal of copper ion from aqueous and industrial waste water depends on pH, concentration of metal ion, concentration of adsorbent, contact time and agitation. Equilibrium adsorption data was tested for the Langmuir equation. Adsorption isotherm studies indicated that Langmuir model fits better for the present case.
Three novel and distinct agricultural waste materials, viz., Casuarinas fruit powder (CFP), sorghum stem powder (SSP) and banana stem powder (BSP) were used as low cost adsorbents for the removal of toxic copper(II) from aqueous solutions. Acid treated adsorbents were characterized by SEM, EDX and FTIR. Different factors effecting adsorption capacity were analyzed and the effi ciency order was BSP>SSP>CFP. Based on the extent of compatibility to Freundlich/Langmuir/D-R/Temkin adsorption isotherm and different models (pseudo-fi rst and second order, Boyd, Weber's and Elovich), chemisorption primarily involved in the case of CFP and SSP, whereas, simultaneous occurrence of chemisorption and physisorption was proposed in the case of BSP. Based on the observations, it was proposed that three kinetic stages involve in adsorption process viz., diffusion of sorbate to sorbent, intra particle diffusion and then establishment of equilibrium. These adsorbents have promising role towards removal of Cu(II) from industrial wastewater to contribute environmental protection.
The adoption of agricultural waste materials in the removal of heavy metals from contaminated waters has gained more recognition in recent times. This study capitalizes on the production of adsorbents from one of the predominant agricultural waste materials (Plantain Peel) in Ado-Odo Ota, to access its metal-removal efficiency. This work investigated Cu 2+ adsorption using activated carbon processed from chemically modified unripe plantain (Musa paradisiaca) peel. Adsorption studies were performed using batch experiments wherewith the influence of pH of the solution, initial concentration, temperature and contact time have been cross-examined. The results displayed a 99.8% removal efficiency of Cu 2+ at pH 7.5, 30°C and 150 mg/L concentration. The equilibrium adsorption capacity of unripe Musa paradisiaca peel has been obtained using linear models of Langmuir and Freundlich isotherms. The result is poised to elucidate the metal retention mechanism as a process involving ion exchange as the divalent metal ion binds to the activated unripe plantain peel.
Removal of copper (II) from aqueous solution by adsorption onto low-cost adsorbents
Journal of Environmental Management, 2008
The use of low-cost adsorbents was investigated as a replacement for current costly methods of removing metals from aqueous solution. Removal of copper (II) from aqueous solution by different adsorbents such as shells of lentil (LS), wheat (WS), and rice (RS) was investigated. The equilibrium adsorption level was determined as a function of the solution pH, temperature, contact time, initial adsorbate concentration and adsorbent doses. Adsorption isotherms of Cu (II) on adsorbents were determined and correlated with common isotherm equations such as Langmuir and Freundlich models. The maximum adsorption capacities for Cu (II) on LS, WS and RS adsorbents at 293, 313 and 333 K temperature were found to be 8. 977, 9.510, and 9.588; 7.391, 16.077, and 17.422; 1.854, 2.314, and 2.954 mg g À1 , respectively. The thermodynamic parameters such as free energy (DG 0 ), enthalpy (DH 0 ) and entropy changes (DS 0 ) for the adsorption of Cu (II) were computed to predict the nature of adsorption process. The kinetics and the factors controlling the adsorption process were also studied. Locally available adsorbents were found to be low-cost and promising for the removal of Cu (II) from aqueous solution. r
Adsorption of copper (II) from aqueous solution by neem bark powder (NBP) has been investigated in the present work. All the experiments were performed under batch mode technique. Copper (II) removal is maximum at the pH: 5, adsorbent dose: 0.9 g/50 ml, contact time: 90 min and initial copper (II) ion concentration: 62.5 mg/lit. The correlation coefficient values for the adsorption isotherms: Freundlich, Langmuir, Temkin and Dubinin-Radushkevich are 0.632, 0.719, 0.760 and 0.907 respectively and for kinetic models: pseudo-first order, pseudo-second order and intraparticle diffusion equations are 0.992, 0.994 and 0.991 respectively. Langmuir maximum adsorption capacity, qmax, Temkin heat of sorption, B, and the Dubinin-Radushkevich mean free energy, E, for NBP are 10.30 mg/g, 1.180 J/mol and 0.68 KJ/mol.
Sesame Husk as Adsorbent for Copper(II) Ions Removal from Aqueous Solution
Journal of Geoscience and Environment Protection, 2017
In this study, the adsorption behavior of copper(II) ions from aqueous solutions onto sesame husk (SH) was investigated. The effect of different parameters such as pH, contact time, adsorbent dosage, adsorbate concentration, temperature and agitation speed was studied. Thermodynamic parameters, equilibrium isotherms and kinetic data have been evaluated. The functional groups and surface morphology of SH adsorbent were characterized by FTIR and SEM. Adsorption equilibrium isotherms were expressed by Langmuir, Freundlich and Dubinin-Radushkevich (D-R) adsorption models and it was found that Langmuir adsorption model fits the experimental data better than Freundlich and D-R models. The adsorption can be best described by the pseudo second-order kinetic model. The maximum adsorption capacity of SH was compared to that of other reported adsorbents.
Adsorption of copper metal ion from aqueous solution by using low cost materials
To Chemistry Journal, 2020
In this study the matki (Vigna aconitifolia) seed husk was tested for removal of Cu metal ion from solution. Batch adsorption techniques were administered to measure the adsorption characteristics of the matki seed husk for Cu (II) metal ion removal from aqueous solutions. The adsorption isotherms, thermodynamic parameters, kinetics, effect of pH were examined. The results show that the utmost adsorption capacity of matki seed husk was approximately 80.39 % Cu (II) at temperature 305 K and at the initial Cu (II) metal ion concentration of 100 mg/L and at 5.1 pH. Adsorption isotherm data might be well fitted by Frendlich isotherm equation. Thermodynamic studies confirmed that the method was spontaneous and endothermic. The adsorption amounts of Cu (II) metal ion tend to extend with the rise in of pH. The relatively low cost and high capability of the matki seed husk make it potentially attractive adsorbent for the removal of Cu (II) metal ions from waste water
Groundwater for Sustainable Development, 2016
In the present work Caryota urens seeds (CUS), a plant based adsorbent, were modified chemically using different chemical reagents. Among all reagents, NaOH was found to be the most effective modificant. Alkali treated C. urens seeds (ATCUS) exhibited higher removal efficiency (99%) towards Cu(II) than the raw CUS (91%). Characterization of both raw and modified CUS was carried out via SEM, EDX and FTIR analysis. Various physico-chemical parameters such as effect of contact time, initial Cu(II) concentration, pH, adsorbent dose and temperature were investigated using batch process to optimize conditions for maximum adsorption. Adsorption process was found to be fast with equilibrium time of 30-60 min was investigated over concentration range of 10-100 mg L À 1. Optimum pH was found to be 6. Maximum adsorption capacity (q m) as calculated from Langmuir isotherm was found to be 27.39 mg g À 1. Thermodynamic parameters, ΔH°and ΔG°, indicated that the process was endothermic and spontaneous in nature. Analysis of adsorption kinetics indicated better applicability of pseudo-second order kinetic model. Breakthrough and desorption studies were carried out by column process. Breakthrough and exhaustive capacities were found to be 6 and 15 mg g À 1 , respectively. Regeneration study of ATCUS indicated that the adsorbent can be used effectively upto three consecutive cycles.