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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