研究报告

  • 聂明华,徐文丽,张文静,吴乐良,董文博,晏彩霞.Fe2+和零价铁活化过一硫酸盐降解酸性橙7[J].环境科学学报,2018,38(10):3997-4005

  • Fe2+和零价铁活化过一硫酸盐降解酸性橙7
  • Degradation of acid orange 7 by peroxymonosulfate activated by Fe2+ and zerovalent iron
  • 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
  • 作者
  • 单位
  • 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- > HPO42- > H2PO4- > HCO3-/CO32- > 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.

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