Highly efficient removal of chromium (VI) through adsorption and reduction: A column dynamic study using magnetized natural zeolite-polypyrrole composite

Nomcebo H. Mthombeni, Sandrine Mbakop, Sekhar Ray, Taile Leswifi, Aoyi Ochieng, Maurice S. Onyango

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

A composite of magnetized natural zeolite and polypyrrole (MZ-PPY) was synthesized and used to explore Cr(VI) removal from aqueous solution and environmental water. A column dynamic set up was employed to analyse adsorption breakthrough performance under different process conditions. Material characterization was done to assess morphology and functional groups and to elucidate Cr(VI) removal mechanism. Results indicate that Cr(VI) removal is a function of bed mass, flowrate and initial Cr(VI) concentration. Sharp breakthrough curves were obtained which are fingerprints of reaction kinetics controlled adsorption process. Consequently, three simple kinetic models; Yoon–Nelson, Thomas and Bohart–Adams were applied to the experimental data to predict the breakthrough curves and to determine the characteristic parameters of the column that are useful for process design. The Yoon–Nelson and Thomas models were found to appropriately describe the breakthrough curves. From material characterization, Cr(VI) removal proceeded mainly by adsorption and reduction. Meanwhile using adsorbent exhaustion rate (AER) as performance indicator, a low value of 0.25 was obtained for environmental water from a chrome mine suggesting that MZ-PPY is a highly efficient adsorption media.
Original languageEnglish
Pages (from-to)4008-4017
JournalJournal of Environmental Chemical Engineering
Volume6
Issue number4
DOIs
Publication statusPublished - Aug 2018

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Zeolites
Polypyrroles
zeolite
chromium
Chromium
breakthrough curve
adsorption
Adsorption
Composite materials
reaction kinetics
Reaction kinetics
Adsorbents
Water
Functional groups
functional group
Process design
aqueous solution
kinetics
water
Kinetics

Cite this

@article{803b9408424c439c97de3e1b61a28636,
title = "Highly efficient removal of chromium (VI) through adsorption and reduction: A column dynamic study using magnetized natural zeolite-polypyrrole composite",
abstract = "A composite of magnetized natural zeolite and polypyrrole (MZ-PPY) was synthesized and used to explore Cr(VI) removal from aqueous solution and environmental water. A column dynamic set up was employed to analyse adsorption breakthrough performance under different process conditions. Material characterization was done to assess morphology and functional groups and to elucidate Cr(VI) removal mechanism. Results indicate that Cr(VI) removal is a function of bed mass, flowrate and initial Cr(VI) concentration. Sharp breakthrough curves were obtained which are fingerprints of reaction kinetics controlled adsorption process. Consequently, three simple kinetic models; Yoon–Nelson, Thomas and Bohart–Adams were applied to the experimental data to predict the breakthrough curves and to determine the characteristic parameters of the column that are useful for process design. The Yoon–Nelson and Thomas models were found to appropriately describe the breakthrough curves. From material characterization, Cr(VI) removal proceeded mainly by adsorption and reduction. Meanwhile using adsorbent exhaustion rate (AER) as performance indicator, a low value of 0.25 was obtained for environmental water from a chrome mine suggesting that MZ-PPY is a highly efficient adsorption media.",
author = "Mthombeni, {Nomcebo H.} and Sandrine Mbakop and Sekhar Ray and Taile Leswifi and Aoyi Ochieng and Onyango, {Maurice S.}",
year = "2018",
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Highly efficient removal of chromium (VI) through adsorption and reduction: A column dynamic study using magnetized natural zeolite-polypyrrole composite. / Mthombeni, Nomcebo H.; Mbakop, Sandrine; Ray, Sekhar; Leswifi, Taile; Ochieng, Aoyi; Onyango, Maurice S.

In: Journal of Environmental Chemical Engineering, Vol. 6, No. 4, 08.2018, p. 4008-4017.

Research output: Contribution to journalArticle

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T1 - Highly efficient removal of chromium (VI) through adsorption and reduction: A column dynamic study using magnetized natural zeolite-polypyrrole composite

AU - Mthombeni, Nomcebo H.

AU - Mbakop, Sandrine

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AU - Leswifi, Taile

AU - Ochieng, Aoyi

AU - Onyango, Maurice S.

PY - 2018/8

Y1 - 2018/8

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AB - A composite of magnetized natural zeolite and polypyrrole (MZ-PPY) was synthesized and used to explore Cr(VI) removal from aqueous solution and environmental water. A column dynamic set up was employed to analyse adsorption breakthrough performance under different process conditions. Material characterization was done to assess morphology and functional groups and to elucidate Cr(VI) removal mechanism. Results indicate that Cr(VI) removal is a function of bed mass, flowrate and initial Cr(VI) concentration. Sharp breakthrough curves were obtained which are fingerprints of reaction kinetics controlled adsorption process. Consequently, three simple kinetic models; Yoon–Nelson, Thomas and Bohart–Adams were applied to the experimental data to predict the breakthrough curves and to determine the characteristic parameters of the column that are useful for process design. The Yoon–Nelson and Thomas models were found to appropriately describe the breakthrough curves. From material characterization, Cr(VI) removal proceeded mainly by adsorption and reduction. Meanwhile using adsorbent exhaustion rate (AER) as performance indicator, a low value of 0.25 was obtained for environmental water from a chrome mine suggesting that MZ-PPY is a highly efficient adsorption media.

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