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
SN - 1876-1070
SP - 242
EP - 251
JO - Journal of the Taiwan Institute of Chemical Engineers
JF - Journal of the Taiwan Institute of Chemical Engineers
ER -