• 关键词：硫酸根自由基  共存物质  降解路径  过一硫酸盐  酸性橙7

• 基金项目：国家自然科学基金（No.41601523，41601521）；江西省自然科学基金（No.20161BAB213079，20161BAB213077）；鄱阳湖湿地与流域研究教育部重点实验室开放基金（No.PK2016006）；江西省教育厅科技计划项目（No.GJJ150307，GJJ160320）；江西师范大学博士启动基金

• 聂明华
• 江西师范大学地理与环境学院, 鄱阳湖湿地与流域研究教育部重点实验室, 南昌 330022

• 徐文丽
• 江西师范大学地理与环境学院, 鄱阳湖湿地与流域研究教育部重点实验室, 南昌 330022

• 张文静
• 江西师范大学地理与环境学院, 鄱阳湖湿地与流域研究教育部重点实验室, 南昌 330022

• 吴乐良
• 江西师范大学地理与环境学院, 鄱阳湖湿地与流域研究教育部重点实验室, 南昌 330022

• 董文博
• 复旦大学环境科学与工程系, 上海市大气颗粒物污染与防治重点实验室, 上海 200433

• 晏彩霞
• 江西师范大学地理与环境学院, 鄱阳湖湿地与流域研究教育部重点实验室, 南昌 330022

• 摘要：采用环境友好的Fe²⁺和零价铁（ZVI）作活化剂，活化过一硫酸盐（PMS）来降解水中酸性橙7（AO7）.结果表明，在Fe²⁺-PMS体系中，AO7的降解效果不佳，但通过添加适量的络合剂，AO7的去除率会大幅提高.ZVI在PMS存在下被腐蚀，并能够缓慢、持续不断地释放Fe²⁺.ZVI-PMS体系可以在比较宽泛的pH范围（3~9）有效、快速地降解AO7，并且在酸性条件下降解速率较快.淬灭实验结果显示，硫酸根自由基（SO₄^·-）对AO7的降解起主要作用.除了Cl^-和高浓度（50 mmol·L^-1）的NO₃^-能够促进AO7的降解外，其他水中共存的阴离子对AO7在ZVI-PMS体系中的降解具有抑制作用，而腐殖酸（HA）则无明显影响.AO7在超纯水中的去除率高于其他实际水体，但反应90 min后，污水厂出水过滤水和胶体浓缩液中的AO7去除率也可高达98.6%和87.6%，说明ZVI-PMS可能可以有效地去除含有较高DOC含量的污水中的AO7.利用GC-MS检测到辐照后溶液中有3种中间产物，推测主要是通过AO7偶氮键断键后的中间产物进一步氧化形成.此外，TOC在一定程度上降低，说明部分AO7被矿化.

• Abstract：This study evaluated the degradation of acid orange 7 (AO7) by peroxymonosulfate (PMS) activated by Fe²⁺ and zerovalent iron (ZVI). Results show that the Fe²⁺-PMS system ineffectively removed AO7. However, several chelating agents at an appropriate concentration could significantly improve the AO7 degradation. Comparing with Fe²⁺, ZVI served as an alternative iron source that could continuously release Fe²⁺ to activate PMS. The ZVI-PMS system was effective in a broader initial pH range from 3 to 9, and low pH promoted AO7 removal. In addition, the results of scavenging tests suggest that SO₄^·- radicals other than ^·OH were the primary reactive oxygen species in the ZVI-PMS system. Cl^- and NO₃^- (50 mmol·L^-1) are found to accelerate AO7 decolourization rates while other anions retard AO7 degradation in the following sequence:NO₂^- > HPO₄^2- > H₂PO₄^- > HCO₃^-/CO₃^2- > NO₃^-. In addition, no obvious impact was found by adding HA. The decolourization rate of AO7 in ultra-pure water was the highest among different water matrices. The removal efficiencies of AO7 from the filtrate and retentate phase of wastewater were up to 98.6% and 87.6% over 90 min, respectively. It is expected that the ZVI-PMS system could be applied for AO7 removal from wastewater containing a considerable organic carbon content. Based on the analysis of GC-MS and TOC, 3 major intermediate products were identified and the preliminary degradation pathways were proposed.

• Key words：sulfate radical  coexisting substances  degradation pathway  peroxymonosulfate  acid orange 7

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