Adsorption of hexavalent chromium onto magnetic natural zeolite-polymer composite

Nomcebo H. Mthombeni, Maurice S. Onyango, Aoyi Ochieng

Research output: Contribution to journalArticle

41 Citations (Scopus)

Abstract

Magnetic natural zeolite-polypyrrole (MZ-PPy) composite was prepared for enhanced removal of hexavalent chromium [Cr(VI)] from aqueous solution. The structure and morphology of the prepared adsorbent was analyzed with the Fourier transform infrared (FTIR), field-emission microscope (FE-SEM), energy dispersive X-ray (EDX), high resolution transmission electron microscope (HR-TEM) and X-ray diffraction (XRD). The effects of magnetic zeolite loading within the composite, initial pH, sorbent dosage, temperature and Cr(VI) concentration on Cr(VI) removal efficiency were investigated. Up to 99.99% removal efficiency was obtained when the pH was 2 and the initial Cr(VI) concentration was 300 mg/L. The sorption kinetic data fitted well to the pseudo-second order model and isotherm data fitted well to the Langmuir isotherm model. The maximum adsorption capacity determined from the Langmuir isotherm increased from 344.83 to 434.78 mg/g as the temperature was increased from 25 °C to 45 °C. Thermodynamic parameters revealed that the adsorption process is spontaneous and endothermic in nature. The results further indicated that the adsorption capacity is decreased in the presence of SO42− ions. The adsorption–desorption studies indicated that MZ-PPy retained its original Cr(VI) sorption capacity up to two consecutive cycles.
Original languageEnglish
Pages (from-to)242-251
JournalJournal of the Taiwan Institute of Chemical Engineers
DOIs
Publication statusPublished - 2015

Fingerprint

Natural polymers
Zeolites
Isotherms
Chromium
Polypyrroles
Adsorption
Sorption
Composite materials
Field emission microscopes
Sorbents
Adsorbents
Fourier transforms
Electron microscopes
Thermodynamics
Infrared radiation
X ray diffraction
X rays
Temperature
Scanning electron microscopy
Kinetics

Cite this

@article{f87ebcba73a244bab4f8e2a29043707e,
title = "Adsorption of hexavalent chromium onto magnetic natural zeolite-polymer composite",
abstract = "Magnetic natural zeolite-polypyrrole (MZ-PPy) composite was prepared for enhanced removal of hexavalent chromium [Cr(VI)] from aqueous solution. The structure and morphology of the prepared adsorbent was analyzed with the Fourier transform infrared (FTIR), field-emission microscope (FE-SEM), energy dispersive X-ray (EDX), high resolution transmission electron microscope (HR-TEM) and X-ray diffraction (XRD). The effects of magnetic zeolite loading within the composite, initial pH, sorbent dosage, temperature and Cr(VI) concentration on Cr(VI) removal efficiency were investigated. Up to 99.99{\%} removal efficiency was obtained when the pH was 2 and the initial Cr(VI) concentration was 300 mg/L. The sorption kinetic data fitted well to the pseudo-second order model and isotherm data fitted well to the Langmuir isotherm model. The maximum adsorption capacity determined from the Langmuir isotherm increased from 344.83 to 434.78 mg/g as the temperature was increased from 25 °C to 45 °C. Thermodynamic parameters revealed that the adsorption process is spontaneous and endothermic in nature. The results further indicated that the adsorption capacity is decreased in the presence of SO42− ions. The adsorption–desorption studies indicated that MZ-PPy retained its original Cr(VI) sorption capacity up to two consecutive cycles.",
author = "Mthombeni, {Nomcebo H.} and Onyango, {Maurice S.} and Aoyi Ochieng",
year = "2015",
doi = "10.1016/j.jtice.2014.12.037",
language = "English",
pages = "242--251",
journal = "Journal of the Taiwan Institute of Chemical Engineers",
issn = "1876-1070",
publisher = "Taiwan Institute of Chemical Engineers",

}

Adsorption of hexavalent chromium onto magnetic natural zeolite-polymer composite. / Mthombeni, Nomcebo H.; Onyango, Maurice S.; Ochieng, Aoyi.

In: Journal of the Taiwan Institute of Chemical Engineers, 2015, p. 242-251.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Adsorption of hexavalent chromium onto magnetic natural zeolite-polymer composite

AU - Mthombeni, Nomcebo H.

AU - Onyango, Maurice S.

AU - Ochieng, Aoyi

PY - 2015

Y1 - 2015

N2 - Magnetic natural zeolite-polypyrrole (MZ-PPy) composite was prepared for enhanced removal of hexavalent chromium [Cr(VI)] from aqueous solution. The structure and morphology of the prepared adsorbent was analyzed with the Fourier transform infrared (FTIR), field-emission microscope (FE-SEM), energy dispersive X-ray (EDX), high resolution transmission electron microscope (HR-TEM) and X-ray diffraction (XRD). The effects of magnetic zeolite loading within the composite, initial pH, sorbent dosage, temperature and Cr(VI) concentration on Cr(VI) removal efficiency were investigated. Up to 99.99% removal efficiency was obtained when the pH was 2 and the initial Cr(VI) concentration was 300 mg/L. The sorption kinetic data fitted well to the pseudo-second order model and isotherm data fitted well to the Langmuir isotherm model. The maximum adsorption capacity determined from the Langmuir isotherm increased from 344.83 to 434.78 mg/g as the temperature was increased from 25 °C to 45 °C. Thermodynamic parameters revealed that the adsorption process is spontaneous and endothermic in nature. The results further indicated that the adsorption capacity is decreased in the presence of SO42− ions. The adsorption–desorption studies indicated that MZ-PPy retained its original Cr(VI) sorption capacity up to two consecutive cycles.

AB - Magnetic natural zeolite-polypyrrole (MZ-PPy) composite was prepared for enhanced removal of hexavalent chromium [Cr(VI)] from aqueous solution. The structure and morphology of the prepared adsorbent was analyzed with the Fourier transform infrared (FTIR), field-emission microscope (FE-SEM), energy dispersive X-ray (EDX), high resolution transmission electron microscope (HR-TEM) and X-ray diffraction (XRD). The effects of magnetic zeolite loading within the composite, initial pH, sorbent dosage, temperature and Cr(VI) concentration on Cr(VI) removal efficiency were investigated. Up to 99.99% removal efficiency was obtained when the pH was 2 and the initial Cr(VI) concentration was 300 mg/L. The sorption kinetic data fitted well to the pseudo-second order model and isotherm data fitted well to the Langmuir isotherm model. The maximum adsorption capacity determined from the Langmuir isotherm increased from 344.83 to 434.78 mg/g as the temperature was increased from 25 °C to 45 °C. Thermodynamic parameters revealed that the adsorption process is spontaneous and endothermic in nature. The results further indicated that the adsorption capacity is decreased in the presence of SO42− ions. The adsorption–desorption studies indicated that MZ-PPy retained its original Cr(VI) sorption capacity up to two consecutive cycles.

U2 - 10.1016/j.jtice.2014.12.037

DO - 10.1016/j.jtice.2014.12.037

M3 - Article

SP - 242

EP - 251

JO - Journal of the Taiwan Institute of Chemical Engineers

JF - Journal of the Taiwan Institute of Chemical Engineers

SN - 1876-1070

ER -