Mechanisms for the enhanced photo-Fenton activity of ferrihydrite modified with BiVO4 at neutral pH
Mechanisms for the enhanced photo-Fenton activity of ferrihydrite modified with BiVO4 at neutral pH
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BiVO4 修饰的水铁矿在中性 pH 值下增强光芬顿活性的机制
DOI：
10.1016/j.apcatb.2017.04.064
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发表时间：
2017-09
影响因子：
22.1
通讯作者：
He Hongping
中科院分区：
文献类型：
--
作者：
Xu Tianyuan;Zhu Runliang;Zhu Gangqiang;Zhu Jianxi;Liang Xiaoliang;Zhu Yanping;He Hongping
由于Fe2+的再生速率相对较低，在接近中性的pH下，非均相光fenton催化剂通常表现出非常弱的光fenton活性。本研究的目的是开发一种新型的非均相光fenton催化剂，这种催化剂可以加速Fe2+的再生，从而在接近中性的ph下具有优异的光fenton活性。在本研究中，BiVO4修饰了水合铁（Fh），合成了BiVO4/Fh复合材料，我们期望BiVO4的光生电子可以加速Fh上Fe2+的再生。对h2o2消耗机理的研究表明，bivo4的引入促进了h2o2分解为活性氧（ROS）。此外，根据EPR光谱和荧光探针工具显示的ROS形成结果，bivo4的存在阻止了o2自由基dot -的产生，加速了自由基dotOH的形成。XPS表征和1,10-菲罗啉分光光度法定量测定结果表明，BiVO4/Fh表面的Fe2+浓度高于Fh表面。这些结果表明，bivo4的引入可以通过将光电子从bivo4转移到Fh表面的Fe3+来加速Fe3+还原为Fe2+。同时，BiVO4/Fh对酸性红18的脱色效率高于Fh和纯BiVO4，验证了BiVO4的引入即使在接近中性的ph下也能显著提高Fh的光- fenton催化活性。本研究对理解半导体修饰的非均相光fenton催化剂的光fenton机理具有重要意义，并证实了半导体的引入可以提高非均相光fenton催化剂在酸性和中性pH下的光fenton催化活性。
Heterogeneous photo-Fenton catalysts generally show very weak photo-Fenton activity at near-neutral pH because of the relatively low rate of Fe2+regeneration. The aim of this work is to develop novel heterogeneous photo-Fenton catalysts, which can accelerate the regeneration of Fe2+and thus have superior photo-Fenton activity at near-neutral pH. In this study, ferrihydrite (Fh) was modified with BiVO4to synthesize BiVO4/Fh composites, and we expected that the photogenerated electrons from BiVO4would accelerate the regeneration of Fe2+on Fh. Mechanistic investigation of H2O2consumption showed that the introduction of BiVO4promoted the decomposition of H2O2into reactive oxygen species (ROS). In addition, the presence of BiVO4deterred O2radical dot−production and accelerated the formation of radical dotOH, according to the results of ROS formation, as shown with EPR spectroscopy and fluorescent probes tools. Furthermore, the Fe2+concentration on the surface of BiVO4/Fh was higher than that on Fh based on the results of XPS characterization and quantitative measurement with a 1,10-phenanthroline spectrophotometric method. These results demonstrated that the introduction of BiVO4can accelerate the reduction of Fe3+to Fe2+by transferring photogenerated electrons from BiVO4to Fe3+on the surface of Fh. Meanwhile, a higher decolorization efficiency of acid red 18 by BiVO4/Fh than by Fh and pure BiVO4verified that the introduction of BiVO4can significantly enhance the photo-Fenton catalytic activity of Fh even at near-neutral pH. Overall, our work has important implications for understanding the photo-Fenton mechanisms on semiconductor modified heterogeneous photo-Fenton catalysts and confirms that the introduction of a semiconductor can enhance the photo-Fenton catalytic activity of heterogeneous photo-Fenton catalysts in acidic and neutral pH.
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BiVO4/Fe/Mt 复合材料用于可见光驱动的酸性红 18 降解
影响因子：
5.6
作者：
Xu Tianyuan;Zhu Runliang;Zhu Jianxi;Liang Xiaoliang;Liu Yun;Xu Yin;He Hongping
通讯作者：
He Hongping
配体诱导显着增强纳米 BiFeO3 氧化降解双酚 A 的催化活性
影响因子：
12.9
作者：
Wang, Nan;Zhu, Lihua;Lei, Ming;She, Yuanbin;Cao, Meijuan;Tang, Heqing
通讯作者：
Tang, Heqing
DOI：
--
发表时间：
2009
期刊：
--
影响因子：
--
作者：
hangha Lee;D. Sedlak
通讯作者：
hangha Lee;D. Sedlak
影响因子：
3.9
作者：
Li, XZ;Chen, CC;Zhao, JC
通讯作者：
Zhao, JC
影响因子：
12.8
作者：
Klamerth, N.;Malato, S.;Fernandez-Alba, A.
通讯作者：
Fernandez-Alba, A.