文献类型：期刊文献

英文题名：The roles of pyrite for enhancing reductive removal of nitrobenzene by zero-valent iron

作者：Lu, Ying[1];Li, Jianfa[1];Li, Yimin[1];Liang, Liping[2];Dong, Huaping[1];Chen, Kun[1];Yao, Chunxia[1];Li, Zhanfeng[1];Li, Jinxiang[3];Guan, Xiaohong[3,4]

机构：[1]Shaoxing Univ, Coll Chem & Chem Engn, Huancheng West Rd 508, Shaoxing 312000, Zhejiang, Peoples R China;[2]Shaoxing Univ, Coll Life Sci, 900 South City Rd, Shaoxing 312000, Zhejiang, Peoples R China;[3]Tongji Univ, Coll Environm Sci & Engn, State Key Lab Pollut Control & Resource Reuse, Shanghai 200092, Peoples R China;[4]Shanghai Inst Pollut Control & Ecol Secur, Shanghai 200092, Peoples R China

年份：2019

卷号：242

起止页码：9

外文期刊名：APPLIED CATALYSIS B-ENVIRONMENTAL

收录：SCI-EXPANDED(收录号：WOS:000450135000002)、、Scopus(收录号：2-s2.0-85054188049)、WOS

基金：This work was supported by the National Natural Science Foundation of China (Nos. 21477081, 21777103, 21777117), and Shanghai Science and Technology Committee (17DZ1202203).

语种：英文

外文关键词：Pyrite; Zero valent iron; Reduction; Nitrobenzene; Synergetic effect

外文摘要：Zero-valent iron (ZVI) is a popular reductant that has been successfully applied for remediation of groundwater contaminated with various pollutants, but it still suffers from surface passivation and pH increase in the reaction media. In this study, pyrite, a ubiquitous sulfide mineral in anaerobic environment, was adopted to enhance the reactivity of ZVI for removal of nitrobenzene. The synergetic effect between pyrite and ZVI was observed for nitrobenzene reduction, and the rate constant k(obs) at the initial pH (pH(o)) 6.0 was enhanced by 8.55-23.1 folds due to the presence of pyrite with pyrite/ZVI mass ratio ranging from 1.0 to 6.0. Moreover, nitrobenzene could be removed effectively at pHo ranging from 5.0 to 10.0 in the presence of pyrite, while negligible removal of nitrobenzene by ZVI (0.5 g/L) alone was observed at pH(o) >= 7.0. ZVI sample recovered from the reacted ZVI/pyrite mixture was also more effective for nitrobenzene degradation than pristine ZVI. The mechanism study revealed that pyrite could suppress the pH increase in reaction media, boost the production of reactive Fe2+, and activate the ZVI surface through replacing partially the passive oxide film with iron sulfide (FeS). In particular, the formation of highly reactive FeS@Fe in the reaction system of ZVI/pyrite mixture was proved by XRD, Mossbauer,}CANES, XPS and SEM-EDS analyses, which provides a facile way for in-situ sulfidation of ZVI and for enhancing the removal of contaminants with ZVI technology.