Vanadium (V) adsorption isotherms and kinetics using polypyrrole coated magnetized natural zeolite

Journal article

Authors / Editors

Ochieng, Aoyi

Research Areas

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Publication Details

Author list: Mthombeni NH, Mbakop S, Ochieng A, Onyango MS

Publisher: Elsevier

Place: AMSTERDAM

Publication year: 2016

Journal: Journal of the Taiwan Institute of Chemical Engineers (1876-1070)

Journal acronym: J TAIWAN INST CHEM E

Volume number: 66

Start page: 172

End page: 180

Number of pages: 9

ISSN: 1876-1070

eISSN: 1876-1089

Languages: English-Great Britain (EN-GB)

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Abstract

Magnetized natural zeolite-polypyrrole (MZ-PPY) composite as a potential adsorbent for vanadium was prepared via polymerization of pyrrole monomer using FeCl3 oxidant in aqueous medium in which magnetized natural zeolite particles were suspended. The MZ-PPY composite was characterized by attenuated total reflectance Fourier transform infrared spectroscope (ATR-FTIR), field emission scanning electron microscope (FE-SEM) and high resolution transmission electron microscope (HR-TEM). Batch adsorption studies were performed to test the ability of the adsorbent to remove V(V) ions from aqueous solution. From sorption equilibrium modelling, the equilibrium data is well described by Langmuir, Sips and Redlich-Peterson isotherms while the adsorption kinetics is described by the pseudo-second order model. The Langmuir adsorption capacity is 65.0 mg/g at 298 K. Thermodynamic parameters confirm the spontaneous and endothermic nature of the vanadium adsorption process. Meanwhile V(V) removal process is found not to be affected by co-existing ions. Furthermore, the material can be used in two adsorption cycles without compromising its capacity. (C) 2016 Taiwan Institute of Chemical Engineers. Published by Elsevier B.V. All rights reserved.

Keywords

Adsorption isotherm, Kinetic, Natural zeolite, Polypyrrole, Vanadium

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