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Treatment of dye wastewater nanofiltration concentrates containing high level anions by pH sensitive nano-size Fe(III)@silica microgel

Abstract

Fe(III) ions showed pH sensitive dual function of highly treatment activities of on the L-cysteine modified nano-size silica microgel surface (Cys-Fe(III)@mSiO2). The total color and COD degradation efficiencies are higher than 95 % and 83 % for high salt level nanofiltration concentrates without other post-treatment methods. Fe(III) ions could be used as enhanced Fenton-like degradation catalyst on the surface of Cys-Fe(III)@mSiO2 for actual nanofiltration concentrates of dye wastewater under acidic conditions (pH < 5.5) as the first stage. Then the pH of nanofiltration concentrates was increased (pH > 7.5) with the simple addition of Ca(OH)2, the same Fe(III) ions could be used as the excellent coagulant component with the aid of the silica microgel for nanofiltration concentrates as the second stage. With transmission electron microscopy (TEM), X-ray diffraction (XRD), infrared spectra (FT-IR) and related characterizations, the Fe(III)/Fe(II) redox cycle in the Cys-Fe(III)@mSiO2 were accelerated with the addition of L-cysteine, which increases the Fe(II) concentrates and enhances the generation rates of hydroxyl radicals (•OH). The apparent rate constants of Cys-Fe(III)@mSiO2 are almost 5 times higher than that of Fe(III) Fenton-like degradation system.

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Publication details

The article was received on 15 Jul 2017, accepted on 25 Oct 2017 and first published on 30 Oct 2017


Article type: Paper
DOI: 10.1039/C7NJ02575K
Citation: New J. Chem., 2017, Accepted Manuscript
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    Treatment of dye wastewater nanofiltration concentrates containing high level anions by pH sensitive nano-size Fe(III)@silica microgel

    C. Zheng, D. Lian, S. Chang, C. Ma, M. Du and X. Sun, New J. Chem., 2017, Accepted Manuscript , DOI: 10.1039/C7NJ02575K

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