光助MIL-101(Fe)活化过氧化氢氧化洛克沙胂及同步吸附生成的砷酸根

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摘要采用铁基金属有机框架(MIL-101(Fe))在模拟太阳光下活化过氧化氢氧化降解ROX—吸附去除生成的砷酸根.结果表明, 光助MIL-101(Fe)(250mg/L)活化氧化剂H₂O₂(1.0mmol/L)体系可在120min内实现95.27%的ROX去除率, 反应过程中形成的无机砷酸盐(As(Ⅴ))会吸附在MIL-101(Fe)的表面, 最终从溶液中实现84.14%的总砷去除率, 主要活性氧形态·OH和O₂^·–自由基攻击ROX的As-C键, 生成As(Ⅴ)和邻硝基苯酚, 环境实际水体基质对ROX在该系统中的去除有显著促进提升作用.

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	桑林凤
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关键词 ：洛克沙胂, 铁基金属有机框架, 过氧化氢, 吸附

Abstract：An iron-based-organic framework (MIL-101(Fe)) was prepared using a simple one-pot method, aiming to simultaneously oxidize ROX through activating hydrogen peroxide and adsorption formed arsenate under simulated sunlight. The photoassisted MIL-101(Fe) (250mg/L) activating H₂O₂ (1.0mmol/L) system could remove 95.27% of ROX within 120min. Moreover, the arsenate (As(Ⅴ)) formed in this system could be adsorbed onto the surface of MIL-101(Fe) with 84.14% of the total arsenic removal ratio. The main formed reactive oxygen species ·OH and O₂^·– free radicals, attacked the As-C bond of ROX, generated As(Ⅴ) and o-nitrophenol compounds and accelerated the removal process. The actual environment water matrix significantly promoted the removal ratio of ROX in this system.

Key words： roxarsone Fe-based metal-organic framework hydrogen peroxide adsorption

收稿日期: 2021-05-20

PACS:

X52

基金资助:国家自然科学基金资助项目(21377039)

通讯作者: 赵雅萍, 教授, ypzhao@des.ecnu.edu.cn E-mail: ypzhao@des.ecnu.edu.cn

作者简介: 桑林凤(1999-), 女, 安徽霍邱人, 华东师范大学硕士研究生, 主要从事环境功能材料去除水体难降解有机污染物的研究

引用本文:

桑林凤, 苏珊珊, 高紫崴, 金伟, 赵雅萍. 光助MIL-101(Fe)活化过氧化氢氧化洛克沙胂及同步吸附生成的砷酸根[J]. 中国环境科学, 2022, 42(1): 203-212. SANG Lin-feng, SU Shan-shan, GAO Zi-wei, JIN Wei, ZHAO Ya-ping. Photoassisted MIL-101(Fe) activated hydrogen peroxide system for oxidative degradation of roxarsone and adsorption of in-situ formed arsenate. CHINA ENVIRONMENTAL SCIENCECE, 2022, 42(1): 203-212.

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http://www.zghjkx.com.cn/CN/ 或 http://www.zghjkx.com.cn/CN/Y2022/V42/I1/203

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