Enhanced Oxidative and Adsorptive Removal of Diclofenac in Heterogeneous Fenton-like Reaction with Sulfide Modified Nanoscale Zerovalent Iron

Environmental Science & Technology
Yiming SuYalei Zhang

Abstract

Sulfidation of nanoscale zerovalent iron (nZVI) has shown some fundamental improvements on reactivity and selectivity toward pollutants in dissolved-oxygen (DO)-stimulated Fenton-like reaction systems (DO/S-nZVI system). However, the pristine microstructure of sulfide-modified nanoscale zerovalent iron (S-nZVI) remains uncovered. In addition, the relationship between pollutant removal and the oxidation of the S-nZVI is largely unknown. The present study confirms that sulfidation not only imparts sulfide and sulfate groups onto the surface of the nanoparticle (both on the oxide shell and on flake-like structures) but also introduces sulfur into the Fe(0) core region. Sulfidation greatly inhibits the four-electron transfer pathway between Fe(0) and oxygen but facilitates the electron transfer from Fe(0) to surface-bound Fe(III) and consecutive single-electron transfer for the generation of H2O2 and hydroxyl radical. In the DO/S-nZVI system, slight sulfidation (S/Fe molar ratio = 0.1) is able to nearly double the oxidative removal efficacy of diclofenac (DCF) (from 17.8 to 34.2%), whereas moderate degree of sulfidation (S/Fe molar ratio = 0.3) significantly enhances both oxidation and adsorption of DCF. Furthermore, on the basis o...Continue Reading

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Citations

Feb 26, 2021·The Science of the Total Environment·Cui LaiNing An
Dec 4, 2019·Water Research·Ariel Nunez GarciaDenis M O'Carroll
May 19, 2021·Environmental Science and Pollution Research International·Bing WangYubo Sun
Jun 19, 2021·Physical Chemistry Chemical Physics : PCCP·Hao LiJiang Xu
Jun 26, 2021·Environmental Science & Technology·Ariel Nunez GarciaDenis M O'Carroll
Mar 13, 2019·Environmental Science & Technology·Marco MangayayamDominique J Tobler
Jul 9, 2020·ACS Applied Materials & Interfaces·Miroslav BrumovskýRadek Zbořil

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