Removal of hexavalent chromium from aqueous solution by fabricating novel heteroaggregates of montmorillonite microparticles with nanoscale zero-valent iron.

Scientific Reports
Yaru YinTiantian Li

Abstract

This study fabricated novel heteroaggregates of montmorillonite (Mt) microparticles with nanoscale zero-valent iron (nZVI) (Mt-nZVI) and examined the removal of Cr(VI) by the Mt-nZVI through batch experiments. Spherical nZVI particles were synthesized by the liquid phase reduction method, which were then attached on the flat Mt surfaces in monolayer. The fabricated Mt-nZVI had similar removal efficiency for Cr(VI) compared to the monodispersed nZVI particles, but was much greater than that of nZVI aggregates. The removal efficiency of Mt-nZVI increased with decreasing its dosage and increasing initial Cr(VI) concentration, whereas had insignificant change with solution pH. The removal of Cr(VI) by Mt-nZVI was well described by the pseudo second-order kinetics and the Langmuir equilibrium model. The removal was spontaneous and exothermic, which was mainly due to chemsorption rather than intra-particle diffusion according to calculation of change in free energy and enthalpy and Weber-Morris model simulations. X-ray diffraction and X-ray photoelectron spectroscopy analysis revealed that the adsorption was likely due to reduction of Cr(VI) to Cr(III) by Fe(0) and co-precipitation in the form of oxide-hydroxide of Fe(III) and Cr(III...Continue Reading

References

Feb 8, 2006·Journal of Hazardous Materials·Yuh-Shan Ho
Feb 3, 2007·Environmental Science & Technology·Tanapon PhenratGregory V Lowry
Feb 20, 2007·Water Science and Technology : a Journal of the International Association on Water Pollution Research·J E YangK R Yoo
Jun 24, 2009·The Science of the Total Environment·Bing GengXinhua Qi
May 8, 2010·Environmental Science & Technology·Cheng GuStephen A Boyd
Jul 23, 2013·Journal of Environmental Management·Fenglian FuSuya Lin
Sep 2, 2018·Bulletin of Environmental Contamination and Toxicology·Aikaterini ToliNymphodora Papassiopi
Oct 3, 2018·International Journal of Environmental Research and Public Health·Fayuan WangYuhuan Sun
Jan 4, 2019·Environmental Pollution·Yihan WuXiangke Wang
Apr 14, 2019·Journal of Hazardous Materials·Shengsen WangYong Sik Ok

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Methods Mentioned

BETA
X-ray
equilibrium adsorption

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