Journal
DESALINATION AND WATER TREATMENT
Volume 260, Issue -, Pages 119-127Publisher
DESALINATION PUBL
DOI: 10.5004/dwt.2022.28498
Keywords
Bentonite; Nanoscale zerovalent iron; Cr; Adsorption
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Funding
- Jiangsu construction system science and technology project [2019ZD034]
- Key Laboratory of Jiangxi Province for Persistent Pollutants Control and Resources Recycle [ES201980193]
- Natural Science Foundation of colleges and universities of Jiangsu Provincial Department of Education [21KJA610006]
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In this study, bentonite-supported nano zerovalent iron (B-nZVI) was prepared using natural bentonite as a carrier. The composite showed the structural characteristics of two materials and effectively removed Cr(VI) from water. The removal rate of Cr(VI) increased with decreasing pH and initial concentration, and increased with increasing B-nZVI dosage and reaction time. The removal of Cr(VI) by B-nZVI followed a pseudo-second-order reaction kinetic model.
Using natural bentonite as carrier, bentonite-supported nano zerovalent iron (B-nZVI) was prepared by liquid phase reduction method. The composite was characterized by X-ray diffraction, scanning electron microscopy, X-ray photoelectron spectroscopy, and the effect of Cr(VI) removal by B-nZVI was investigated. The results show that the agglomeration effect of nano zerovalent iron is reduced by bentonite loading, and the composite has the structural characteristics of two materials, which can effectively remove Cr(VI) from water. The removal rate of Cr(VI) increased with the decrease of pH and Cr(VI) initial concentration, and increased with the increase of B-nZVI composite dosage and reaction time. The removal rate of Cr(VI) by B-nZVI composite accorded with pseudo-second-order reaction kinetic model.
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