Kinetics, Mechanism, Isotherm and Thermodynamic Studies of Liquid Phase Adsorption of Pb2+ onto Wood Activated Carbon Supported Zerovalent Iron (WAC-ZVI) Nanocomposite

Dada, Adewumi O. and ADEKOLA, F.A and ODEBUNMI, E.O (2017) Kinetics, Mechanism, Isotherm and Thermodynamic Studies of Liquid Phase Adsorption of Pb2+ onto Wood Activated Carbon Supported Zerovalent Iron (WAC-ZVI) Nanocomposite. Cogent Chemistry, 3 (135165). pp. 1-20.

Text (Kinetics, Mechanism, Isotherm and Thermodynamic Studies of Liquid Phase Adsorption of Pb2+ onto Wood Activated Carbon Supported Zerovalent Iron (WAC-ZVI) Nanocomposite) 23312009.2017.1351653 - Published Version Available under License Creative Commons Attribution Non-commercial Share Alike. Download (1kB)

Abstract

The kinetics, mechanism, isotherm and thermodynamics adsorption of Pb2+ onto Wood Activated Carbon Supported Zerovalent Iron (WAC-nZVI) nanocomposite 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 m2/g and BJH Adsorption average pore diameter 116.73 Å. The adsorption of Pb2+ studied in batch process depends on various operational parameters 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-1min-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 investigated for adsorption of Pb2+ onto nano-adsorbents. Validity of kinetics and isotherm models was studied using three statistical models. Post adsorption characterization by SEM, EDX and FTIR confirmed the presence of Pb2+ on the loaded-WAC-nZVI. Thermodynamic parameters (∆Ho, ∆So, ∆Go) confirmed the feasibility, spontaneity and randomness of the adsorption process. This study revealed that WAC-nZVI is a better adsorbent for treatment of industrial wastes in the presence of other competing ions.

Item Type:	Article
Subjects:	Q Science > Q Science (General) Q Science > QD Chemistry S Agriculture > S Agriculture (General)
Divisions:	Faculty of Engineering, Science and Mathematics > School of Chemistry
Depositing User:	Dr Adewumi Oluwasogo DADA
Date Deposited:	30 Nov 2018 11:27
Last Modified:	11 Sep 2019 12:48
URI:	https://eprints.lmu.edu.ng/id/eprint/1450

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