Determination of the equilibrium, kinetic and thermodynamic parameters of adsorption of copper(II) ions onto seeds of (original) (raw)
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Kinetic Study of Cu (II) Adsorption on Adenanthera pavonina seeds
2015
The powdered seeds of Adenanthera pavonina are used to study the biosorption of Cu(II) from aqueous solution. The batch experiments are conducted at at different initial concentrations (10-70 mg/L) of Cu(II) over a contact period of 5-60 minutes. The biosorption equilibrium is established by 40 minutes. The pseudo-first order, the pseudo-second order, Elovich and intra-particle diffusion models have been analyzed to understand the kinetics of the biosorption process. The pseudo-second order kinetic model is found to be the best fit for the present experimental data. The maximum heavy metal ions adsorbed is found to be 10.917mg/g. The present study shows that the powdered Adenanthera pavonina seeds are efficient in biosorption of Cu(II) ions from aqueous solutions.
E3S Web of Conferences, 2018
The adsorption of copper ions Cu2+ by Coriandrum Sativum seeds (CSS) from aqueous solution was studied in order to highlight the importance of coriander seeds as a potential tool in the treatment of wastewaters containing heavy metals. The kinetic studies of adsorption of Cu (II) were discussed using the spectroscopic technique “Inducting Coupled Plasma” (ICP). The effects of initial copper ion concentration and contact time were determined. All results show that coriander seeds have, over their culinary and medicinal benefits, a significant adsorbent power of copper ions.
Nigerian Journal of Chemical Research, 2019
The adsorption of copper (ii) ions from aqueous solution by Luffa cylindrica seed shell biomass was carried out with effects of initial metal ion concentration, solution pH, contact time, adsorbent dose and temperature of the process investigated. An optimum adsorbent dosage of 3.0g showed maximum metal uptake capacity (qe) of 1.9229 mg/g (98.2%) for an initial metal ion concentration of 2.0 mg/L and pH 5.5. Sorption equilibrium time was observed in 30 minutes. The equilibrium adsorption data were analyzed using Langmuir, Freundlich, and Temkin adsorption isotherm models. Temkin isotherm yielded the best fit to the experimental equilibrium adsorption data with a correlation coefficient (R 2) of 0.7027. Pseudo-first-order, pseudo-second-order, and intra-particle diffusion models were used to discuss the kinetics of the adsorption. It was discovered that the adsorption of copper (ii) ions could be described by the pseudo-second-order kinetic model. Thermodynamic parameters such as enthalpy (ΔH 0) and entropy change of the sorption (ΔS 0) evaluated showed that the process was spontaneous, feasible and exothermic in nature. The results indicated that L. Cylindrica seed shell biomass can be used as an effective and low-cost adsorbent to remove copper (ii) ions from aqueous solutions.
Asian Journal of Research in Chemistry, 2021
Heavy metals contaminated water has detrimental health effects to human beings and animals not limited to hypertension, kidney damage, cancer and eventual death. Available water treatment methods have proved to not only function at high operation costs and ineffective but also yielded insignificant results to a local ordinary Kenyan citizens. The present study investigates the use of Jackfruit seeds wastes as a low cost adsorbent in adsorption water treatment technique. Raw and modified Jackfruit seeds adsorbent were applied to study kinetic studies of Cu2+, Cd2+ and Pb2+ ions adsorption from an aqueous solution under batch conditions. The adsorption behavior of the three metal ions onto raw and modified adsorbents was monitored spectrophotometrically and analysed with Pseudo-first-order and Pseudo-second-order kinetic models. Correlation coefficients (R2) confirmed that all experimental data fitted Pseudo-second-order with R2 > 0.984 which implied a chemisorption process. Experi...
There is growing interest in using low cost materials for adsorption as alternatives to activated carbon. The biosorption of copper (II) ions onto Luffa cylindrica as sorbent was studied in this work. Luffa cylindrica was characterized by elemental analysis, surface area, pore size distribution, scanning electron microscopy, and Fourier Transform Infra Red (FTIR) spectrometer. Two factors for adsorption namely particle size and agitation speed were considered. The kinetic models fitted were Pseudo-first order, Pseudo-second order and Intra-particle diffusion. Four error functions, namely coefficient of determination (R 2), hybrid fractional error function (HYBRID), average relative error (ARE) and sum of the errors squared (ERRSQ), were used to predict the best kinetic models for Cu 2+ ions biosorption onto Luffa cylindrica by varying the particle sizes and agitation speed. A coefficient of non-determination, K 2 was explained and was found to be very useful in identifying the best error function while selecting the best kinetic models. The results obtained showed that all the error functions studied were able to select the pseudo second order and the intra-particle diffusion models as the best kinetic models for particle sizes and agitation speeds for this work.
Mediterranean Journal of Chemistry
Coriandrum Sativum seeds (CSS), were tested as a new eco-friendly adsorbent of copper ions from aqueous solutions. Hence, the effect of the most influencing experimental parameters such as initial concentration of Cu (II) and the temperature was studied upon the adsorption process in order to use its results in following studies. Lagergren pseudo-first-order, pseudo-second-order, and Intraparticle diffusion models were used to describe the biosorption kinetics. The adsorption process was also analyzed by Langmuir, Freundlich and Temkin models and the maximum monolayer biosorption capacity of CSS was found to be 33,5 mg. g −1 by using the Langmuir model. So as to investigate the thermodynamic properties of the adsorption process, the Gibbs free energy (ΔG°), enthalpy (ΔH°), and entropy (ΔS°) values in the temperature range of 25-55 C ° were also calculated in order to conclude the process characteristics. SEM and EDAX analysis were effectuated in order to study the surface morphology of CSS before and after the adsorption process.
Adsorption of Cu(II) ions from synthetic solution by sunflower seed husks
Acta Periodica Technologica, 2019
Annual production of the sunflower seed in Serbia is between 650,000-720,000 tons. Most of this amount is used in vegetable oil industry. Abundant by-products from this processing are sunflower seed husks. Husks are usually incinerated by vegetable oil producers in order to obtain energy, used as an animal feed, or, unfortunately, landed up at some landfills. In order to promote new, added value for this abundant, renewable resource, the investigation presented in this paper was conducted. For that purpose, adsorption of Cu(II) ions from synthetic solution by unmodified sunflower seed husks was examined. ATR-FTIR was used to identify functional groups as potential active sites for Cu(II) sorption. Zeta potential values were determined to reveal the surface charge, while the cation exchange capacity (CEC) was determined to reveal the amount of exchangeable ions on its surface. ATR-FTIR analysis revealed the presence of specific functional groups (hydroxyl, carboxyl, carbonyl, and ami...
Environmental Technology, 2012
Adsorption kinetic studies are of great significance in evaluating the performance of a given adsorbent and gaining insight into the underlying mechanism. This work investigated the sorption kinetics of Cu(II) on to coconut shell and Moringa oleifera seeds using batch techniques. To understand the mechanisms of the biosorption process and the potential ratecontrolling steps, kinetic models were used to fit the experimental data. The results indicate that kinetic data were best described by the pseudo-second-order model with correlation coefficients (R 2 ) of 0.9974 and 0.9958 for the coconut shell and Moringa oleifera seeds, respectively. The initial sorption rates obtained for coconut shell and Moringa oleifera seeds were 9.6395 × 10 −3 and 8.3292 × 10 −2 mg g −1 min −1 , respectively. The values of the mass transfer coefficients obtained for coconut shell (1.2106 × 10 −3 cm s −1 ) and Moringa oleifera seeds (8.965 × 10 −4 cm s −1 ) indicate that the transport of Cu(II) from the bulk liquid to the solid phase was quite fast for both materials investigated. The results indicate that intraparticle diffusion controls the rate of sorption in this study; however, film diffusion cannot be neglected, especially at the initial stage of sorption.
Equilibrium sorption isotherm for Cu(II) on Adenanthera pavonina seeds
Archives of Applied Science Research, 2015
The powdered seeds of Adenanthera pavonina have been used to investigate the sorption of Cu(II) from aqueous solution. The process variable included the change of initial metal ion concentration from 10mg/L-70mg/L. it is noted that there is a decrease in percentage removal of Cu(II) with the increase in initial concentration of Cu(II). The Langmuir, Freundlich, Temkin and Dubinin-Radushkevich isotherm models have been obtained from the experimental data. The Langmuir isotherm model is found to be the best fit for the current study with a maximum adsorption capacity of 10.71mg/g. The Dubinin-Radushkevich isotherm model suggests physical adsorption process