化工进展 ›› 2020, Vol. 39 ›› Issue (7): 2817-2827.DOI: 10.16085/j.issn.1000-6613.2019-1605

• 资源与环境化工 • 上一篇    下一篇

FeS/过硫酸盐体系元素价态转化及其降解有机物机制

钱思佳1,2(), 蒲生彦1,2(), 杨顺美1,2   

  1. 1.成都理工大学生态环境学院,四川 成都 610059
    2.国家环境保护水土污染协同控制与联合修复重点实验室,四川 成都 610059
  • 出版日期:2020-07-05 发布日期:2020-07-10
  • 通讯作者: 蒲生彦
  • 作者简介:钱思佳(1997—),女,硕士研究生,研究方向为污染场地原位化学氧化修复。E-mail:sijiaqian1012@163.com
  • 基金资助:
    国家自然科学基金(41772264);国家水体污染重大专项(2018ZX07109)

Valence transition of ferrous sulfide/persulfate system and mechanism of degrading different organic species

Sijia QIAN1,2(), Shengyan PU1,2(), Shunmei YANG1,2   

  1. 1.College of Ecology and Environment, Chengdu University of Technology, Chengdu 610059, Sichuan, China
    2.State Environmental Protection Key Laboratory of Synergetic Control and Joint Remediation for Soil & Water Pollution, Chengdu University of Technology, Chengdu 610059, Sichuan, China
  • Online:2020-07-05 Published:2020-07-10
  • Contact: Shengyan PU

摘要:

由于FeS表面的还原性Fe(Ⅱ)和S(-Ⅱ)都可以作为电子供体,可有效促进有机化合物的还原转化与过硫酸盐的活化,FeS活化过硫酸盐体系在土壤地下水有机污染原位修复中显示出巨大的应用发展潜力。本文综述了FeS活化过硫酸盐产生活性自由基的内在机理及影响体系反应效率的关键因素;总结了活化过程中FeS表面元素转化机制和转化提高途径;较系统地梳理了FeS活化过硫酸盐体系对卤代烃、石油烃、多环芳烃类复杂有机化合物的降解过程机制。最后对研究中存在的问题及在场地污染修复应用中应重点关注的问题进行了展望,应重视修复中产生的过硫酸根、硫酸根及降解中间产物对环境的影响,在实际应用中需要根据不同的环境条件评估FeS/过硫酸盐体系的有效性,并且制定不同的修复策略。

关键词: 硫化铁, 过硫酸盐, 自由基, 有机污染, 元素价态转化, 场地修复

Abstract:

Since Fe() and S(-Ⅱ) on the surface of FeS can be used as electron donors, it can effectively promote the reduction of organic compounds and the activation of persulfate. FeS activating persulfate shows great potential for application in the in situ remediation of organically polluted soil and groundwater. In this paper, the mechanism of FeS activated persulfate and its surface element conversion mechanism were reviewed. The key factors affecting the reaction efficiency and the ways to improve the reaction efficiency were summarized. Degradation mechanism of complex different types of organic pollutants such as petroleum hydrocarbons, halogenated hydrocarbons and polycyclic aromatic hydrocarbons by FeS/persulfate system was systematically established. Finally, the problems existing in the research and the issues that should be paid attention to in the application of site pollution restoration were prospected. The impacts of persulfate, sulfate and degradation intermediates produced in the restoration should be considered. The effectiveness of the FeS/persulfate system needs to be evaluated for different environmental conditions. And for different conditions, different repair strategies are required.

Key words: ferrous sulfide, persulfate, radicals, organic pollution, surface element valence transition, site remediation

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