Removal of 2, 4 dichlorophenol from aqueous medium using chemically modified low-cost adsorbent: Kinetics, isotherm, thermodynamics and regeneration studies
© 2019 Desalination Publications. All rights reserved. Elimination of 2,4 D from water bodies is very much essential and possible using adsorption. Using commercial adsorbents, removal of 2,4 D can be efficient but requires high operating cost and hence this study focuses on feasibility of producing Activated Carbon (AC) from agricultural residue for removing the 2,4 D from aqueous solutions was analyzed. The adsorbent prepared using the chemical method with phosphoric acid at 1:2 ratio and activated at 500°C, washed and dried AC was characterized for understanding its properties. Batch adsorption analysis of 2, 4 D adsorption on AC was conducted to study the effects of initial 2, 4 D concentration (200 mg/L to 1000 mg/L), pH (2–12), contact time (0–360 min) and temperature (30–50°C). The adsorption efficacy of prepared AC on 2, 4 D was determined with the optimized adsorbing conditions. The equilibrium data were analyzed using different isotherm models (Langmuir, Freundlich, Temkin, and Dubinin Radushkevich) and kinetics models (Pseudo-first order, Pseudo-second order). Also, the adsorption mechanism was found using the intra-particle diffusion model. The activated carbon from the selected agricultural residue was shown to be an efficient adsorbent by removing 87.59% of 2, 4 D. The thermodynamic and regeneration studies were carried out to find the feasibility and reusability of adsorbent. From the results, it was confirmed that the system follows Langmuir isotherm, Pseudo-second order and the reaction is spontaneous and endothermic in nature. The maximum regeneration of adsorbent was obtained using NaOH among the other eluents.
Devi, GR; Lakshmi, DV; Gandhi, NN
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