研究报告

  • 聂明华,吴乐良,余林兰,张艺民,张文静,徐文丽,董文博,晏彩霞.零价铁-过硫酸盐体系同时去除水中酸性橙7和磷[J].环境科学学报,2018,38(11):4321-4332

  • 零价铁-过硫酸盐体系同时去除水中酸性橙7和磷
  • Simultaneous removal of acid orange 7 and phosphate from water using zero-valent iron activated persulfate system
  • 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)
  • 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
  • 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
  • 余林兰
  • 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
  • 张艺民
  • 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
  • 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
  • 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:采用零价铁(ZVI)活化过硫酸盐(PS)同时去除水中酸性橙7(AO7)和磷.ZVI-PS体系可以产生强氧化性的SO4·-和HO·,从而去除水中AO7.同时,ZVI最终转化为Fe3+,因此可以用来去除水中磷.结果表明,ZVI-PS体系在酸性条件下可以有效的同时去除水中AO7和磷.淬灭实验结果表明,硫酸根自由基(SO4·-)对AO7的降解起主要作用.水中共存的阴离子和腐植酸(HA)对AO7和磷的去除均有抑制作用,其对AO7和磷去除的抑制能力排序均为:HCO3- > NO- 2 > HA > NO3- > Cl-.AO7和磷在超纯水中的去除率高于其他实际水体,但反应60 min后,实际水体中AO7和磷的去除率也分别高达80.31%~92.69%和87.54%~100%,因此,该体系对实际水体中AO7和磷的处理有潜在的应用价值.通过紫外-可见分光光谱和GC-MS分析说明,AO7经过偶氮键断键后的中间产物进一步氧化形成含苯环类物质.同时,TOC有所降低,说明部分AO7被矿化为CO2和H2O.
  • Abstract:In the present study, zero-valent iron (ZVI) was used as a catalyst to activate persulfate (PS) for the simultaneous removal of acid orange 7 (AO7) and phosphate from aqueous solutions. Sulfate radicals (SO4·-) and hydroxyl radical (HO·) can be generated in ZVI-PS system which may participate in the oxidation of AO7. Meanwhile, ZVI is ultimately transformed to Fe3+, which can potentially serve as a coagulant to remove phosphate. Experimental results indicate that AO7 and phosphate could be simultaneously removed in this process. A stronger acidic condition is more favourable for AO7 and phosphate removal. Radical scavenging tests reveal that the predominant reactive oxygen species for AO7 degradation was SO4·-. Coexisting substances inhibited the AO7 and phosphate removal, and the inhibition of these substances followed the order of HCO3- > NO- 2 > humic acid (HA) > NO3- > Cl-. The removal efficiencies of AO7 and phosphate were lower in real waters than in ultrapure water. Nevertheless, up to 80.31%~92.69% and 87.54%~100% of AO7 and phosphate were removed from the real waters within 60 min, respectively. From the analysis of UV-Vis spectra and GC-MS, it is assumed that the oxidation process is initiated by the separation of azo links. The intermediates containing various oxygenated benzene and naphthalene rings further undergo ring-opening reactions, and finally mineralized to CO2 and H2O.

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