Kinetics, mechanism, isotherm and thermodynamic studies of liquid phase adsorption of Pb2\mathplus onto wood activated carbon supported zerovalent iron (WAC-ZVI) nanocomposite

Dada, Adewumi O. and Adekola, Folahan A. and Odebunmi, Ezekiel O. (2017) Kinetics, mechanism, isotherm and thermodynamic studies of liquid phase adsorption of Pb2\mathplus onto wood activated carbon supported zerovalent iron (WAC-ZVI) nanocomposite. Cogent Chemistry, 3 (1).

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Abstract

The kinetics, mechanism, isotherm, and thermodynamics of adsorption of Pb2+ onto wood-activated carbon-supported zerovalent iron (WAC-nZVI) nanocom- posite was successfully studied. WAC-nZVI was characterized by a combination of spectroscopic and analytical techniques (BET, PZC, FTIR, SEM, and EDX). BET surface area was 101.50 m 2/g and BJH Adsorption average pore diameter 116.73 Å. The adsorption of Pb2+ studied in batch process depends on various operational param- eters ranging from effect of pH to ionic strength. Kinetics data were best described by pseudo-second-order model based on high initial adsorption rate, h2 (166.67 mgg −1 min−1 ) and correlation coefficient (R2 > 0.99). The mechanism was controlled by both external and intraparticle diffusion models confirmed by Bangham and Boyd models. Equilibrium data were fitted to seven isotherm models. The Langmuir monolayer adsorption capacity (77.52 m2 /g) surpassed those previously investi- gated for adsorption of Pb2+ onto nanoadsorbents. Validity of kinetics and isotherm models was studied using three statistical models. Post-adsorption characteriza- tion by SEM, EDX, and FTIR confirmed the presence of Pb2+ on the loaded-WAC-nZVI.

Item Type:	Article
Subjects:	Q Science > Q Science (General) Q Science > QD Chemistry
Depositing User:	Dr Adewumi Oluwasogo DADA
Date Deposited:	15 Jan 2024 11:16
Last Modified:	15 Jan 2024 11:16
URI:	https://eprints.lmu.edu.ng/id/eprint/5108

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