文献类型：期刊文献

英文题名：Pyrite enhanced the reactivity of zero-valent iron for reductive removal of dyes

作者：Chen, Kun[1];Han, Linting[1];Li, Jianfa[1];Lue, Ying[1];Yao, Chunxia[1];Dong, Huaping[1];Wang, Lijun[1];Li, Yimin[1]

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

年份：2020

卷号：95

期号：5

起止页码：1412

外文期刊名：JOURNAL OF CHEMICAL TECHNOLOGY AND BIOTECHNOLOGY

收录：SCI-EXPANDED(收录号：WOS:000508735300001)、、EI(收录号：20200508111945)、Scopus(收录号：2-s2.0-85078682389)、WOS

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

语种：英文

外文关键词：pyrite; zero-valent iron; reduction; organic pollutants; sulfidation; ferrous ions

外文摘要：BACKGROUND Zero-valent iron (ZVI) is an environmentally friendly and cost-efficient material for the removal of contaminants. However, its application is challenged by problems such as surface passivation and pH increase in the reaction media. As a potential solution for this problem, pyrite, a waste of the mining industry, was used together with ZVI for reductive removal of azo dyes. RESULTS In comparison with ZVI alone, the ZVI/pyrite mixture showed dramatically enhanced efficiency and reusability for dye removal, although pyrite itself can hardly remove dyes. The reaction rate constant k(obs) for the removal of Orange II at the initial pH (pH(0)) of 7.0 was enhanced 9.4- to 28.0-fold by using the mixture at a pyrite/ZVI mass ratio ranging from 1 to 4, respectively. The mechanism studies indicate that pyrite not only helped produce more iron(II) by facilitating iron corrosion and the iron(II)/iron(III) cycle in the mixed system, but also activated the ZVI surface by in situ sulfidation. The high reactivity of the adsorbed iron(II) in the mixed system significantly contributed to dye removal, especially at the alkalescent pH. CONCLUSION Pyrite accelerated the reductive removal of dyes by ZVI, through inhibiting its surface passivation and suppressing the pH increase in the reaction media. Therefore, this research proposes a facile method for enhancing the reactivity and applicability of ZVI in environmental remediation. (c) 2020 Society of Chemical Industry