文献类型：期刊文献

英文题名：Enhanced effect of pyrite on the removal of metronidazole by zero valent iron

作者：Han Linting[1];Chen Kun[1];Dong Huaping[1];Li Jianfa[1];Li Yimin[1]

机构：[1]Shaoxing Univ, Coll Chem & Chem Engn, 508 Huancheng West Rd, Shaoxing 312000, Zhejiang, Peoples R China

年份：2021

卷号：600

起止页码：775

外文期刊名：JOURNAL OF COLLOID AND INTERFACE SCIENCE

收录：SCI-EXPANDED(收录号：WOS:000671761400014)、、EI(收录号：20212410507961)、Scopus(收录号：2-s2.0-85107784473)、WOS

基金：This work was supported by the National Natural Science Foundation of China (Nos. 21677101, 21477081, 21777103) , and Natural Science Foundation of Zhejiang Province (LY20B070004) .

语种：英文

外文关键词：Antibiotic; Zero valent iron; Pyrite; Removal; Surface activation; Reductive degradation

外文摘要：The abuse and improper disposal of antibiotics including metronidazole (MNZ) result in serious contamination in aquatic environments. In this study, pyrite, which was not reactive for MNZ removal, was simply mixed with zero valent iron (ZVI) to efficiently remove MNZ in anaerobic aqueous solutions. A dual ZVI/pyrite system consisting of ZVI (1.0 g/L) and pyrite (4.0 g/L) removed MNZ completely in 360 min within a broad pH(0) range (5.0-9.0), and it still maintained a high removal efficiency (similar to 80%) even at a high pH(0) of 10.0. By contrast, single ZVI (1.0 g/L) showed much lower efficiency (4.8%-22.0%) within the same pH(0) range (5.0-10.0). On investigating the mechanism of MNZ removal, the cooperation between ZVI and pyrite enhanced the surface corrosion of ZVI and facilitated the redox cycle of Fe(III)/Fe(II) to generate more sorbed Fe(II), which was a dominant reactive species for MNZ removal. Pyrite also activated the ZVI surface to form FeS@Fe in situ, accelerating the electron transfer from Fe-0 core to the surface-enriched MNZ, and stimulated the formation of green rust sulfate on the ZVI surface to further promote MNZ removal. LC-MS analysis confirmed ZVI/pyrite reductively transformed MNZ into readily biodegradable products by denitration and cleavage of hydroxyethyl. (C) 2021 Elsevier Inc. All rights reserved.