CdSe cluster-modified biogenic α-FeOOH based on macroporous biochar for Fenton-like reaction of As(III)
CdSe cluster-modified biogenic α-FeOOH based on macroporous biochar for Fenton-like reaction of As(III)
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DOI：
10.1016/j.apsusc.2022.152872
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发表时间：
2022-02
影响因子：
6.7
通讯作者：
Yi Peng;Ying Yan;Jing Wang;Ziyang Xiang;Yanmei Li;Junliang Yang;Jinglin Yin;Wen-lei Wang
中科院分区：
文献类型：
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作者：
Yi Peng;Ying Yan;Jing Wang;Ziyang Xiang;Yanmei Li;Junliang Yang;Jinglin Yin;Wen-lei Wang
在这项研究中，通过热解从根际铁菌斑构建基于大孔生物炭的CdSe团簇修饰的生物α − FeOOH。在可见光照射下，光催化-自芬顿体系在30 min内可获得655.75 μmol/L的过氧化氢产率。α-FeOOH含有丰富的铁离子，可直接活化H2 O2产生大量的α-FeOOH自由基。结果表明，10 mg/L的As（III）在20 min内可被完全降解。电子自旋共振谱（ESR）和密度泛函理论（DFT）研究表明，CdSe团簇的引入使体系具有合适的能带结构，O2主要通过双电子还原途径还原为H2 O2.光生电子通过与α-FeOOH中的Fe（III）反应促进Fe（III）/Fe（II）的转化。H2 O2和Fe ~（2+）的存在加速了As（III）的类Fenton氧化反应。
In this study, CdSe cluster-modified biogenic α − FeOOH based on macroporous biochar was constructed from rhizosphere iron plaque via pyrolysis. An ultrahigh H2O2production rate of 655.75 μmol/L was achieved by the photocatalysis-self-Fenton system within 30 min under visible light irradiation. α-FeOOH, with abundant iron ions, can directly activate H2O2to produce abundant ⋅OH radicals. It was found that As(III) (10 mg/L) could be completely degraded within 20 min. Electron spin resonance spectroscopy (ESR) and density functional theory (DFT) revealed that a suitable energy band structure was achieved by the introduction of CdSe clusters; thus, O2was mainly reduced to H2O2through a two-electron reduction route in the reaction system. The photogenerated electrons promoted the conversion of Fe(III)/Fe(II) by reacting with Fe(III) in α-FeOOH. The presence of H2O2and Fe2+in this system accelerates the oxidation of As(III) by a Fenton-like reaction.