Adsorption studies of Co (II) from aqueous solution using <i>Mangifera indica</i> bark substrate

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. Experimental and calculated adsorption capacities was higher for modified adsorbent with Pb2+ ions registering higher values. The rate constants (k2) was higher in modified adsorbent than in raw adsorbent with Pb2+ ions registering highest value of rate of 4.54×10-1 (mg g-1min-1). Adsorption capacities was in the order of Pb2+ > Cu2+ > Cd2+. The results showed viability of the adsorbents for the removal of the heavy metals from waste solution in an economical and environmental friendly manner.

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Adsorption Performance and Reuse Potential of a Green Alga for the removal of an Acidic dye from Synthetic Wastewater

Sagar

Rastogi²

2022

AJRC

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In the present study a Charophyta green alga Chara sp. has been proven to be a very effective and promising adsorbing biomass for the removal of an acidic dye, Methyl Orange [MO] from synthetic wastewater. Adsorption efficiency of alga was studied as a function of various operative variables, such as the contact time to reach equilibrium, pH of an aqueous solution, adsorbent dosage, and temperature for dye removal. The experimental data were analyzed by Langmuir, Freundlich, Temkin, and Dubinin-Radushkevich (D-R) models of adsorption isotherms, and best fit results were found for the Langmuir isotherm model, based on its correlation coefficient values. Pseudo-first-order and Pseudo-second-order kinetic models were applied to describe the adsorption process. It was found that the adsorption of methyl orange could be best described by the pseudo-second-order model. Values of Gibbs free energy (ΔG), entropy ((ΔS), and enthalpy change (ΔH) indicated the spontaneity, randomness, and endothermic nature of the reaction. FTIR studies showed the involvement of carboxyl, hydroxyl, and amide groups in the adsorption process. SEM micrographs displayed the morphological changes on the adsorbent surface, and BET analysis determined the surface area. To check the adsorbent reusability, repeated adsorption-desorption experiments were carried out for five consecutive cycles. The result shows that Chara sp. could be an effectual and reasonable adsorbent material for the management of MO-bearing wastewater.

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Adsorption studies of Co (II) from aqueous solution using Mangifera indica bark substrate

Cited by 4 publications

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Adsorption of pollutants by plant bark derived adsorbents: An empirical review

Adsorption of pollutants by plant bark derived adsorbents: An empirical review

Kinetic modeling of Cu2+, Cd2+ and Pb2+ ions adsorption onto raw and modified Artocarpus heterophyllus L. seeds from a model solution

Adsorption Performance and Reuse Potential of a Green Alga for the removal of an Acidic dye from Synthetic Wastewater

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