In situ grown hierarchical 50%BiOCl/BiOI hollow flowerlike microspheres on reduced graphene oxide nanosheets for enhanced visible-light photocatalytic degradation of rhodamine B
In situ grown hierarchical 50%BiOCl/BiOI hollow flowerlike microspheres on reduced graphene oxide nanosheets for enhanced visible-light photocatalytic degradation of rhodamine B
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DOI：
10.1016/j.apsusc.2017.09.258
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发表时间：
2018-03
影响因子：
6.7
通讯作者：
Xiangde Su;Jinjin Yang;Xiang Yu;Yi Zhu;Yuan-ming Zhang
中科院分区：
文献类型：
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作者：
Xiangde Su;Jinjin Yang;Xiang Yu;Yi Zhu;Yuan-ming Zhang
本文采用一步溶剂热法成功地合成了50%BiOCl/BiOI/氧化石墨烯(50%BiOCl/BiOI/rGO)复合光催化剂。氧化石墨烯(GO)在溶剂热反应过程中发生还原，并与50%BiOCl/BiOI形成新的BiC键。RGO的引入影响了50%BiOCl/BiOI的形态，导致了50%BiOCl/BiOI由实心微球向中空微球的转变。RGO的引入和50%BiOCl/BiOI中空微球的形成都有利于光的吸收。50%BiOCl/BiOI与rGO之间的强相互作用和rGO的导电性大大提高了光生载流子的有效分离。因此，在可见光存在下，GOB-5表现出最高的光催化活性，是原始的50%BiOCl/BiOI的两倍多。机理研究表明，50%的BiOClBiOI在可见光下产生电子和空穴，空穴与O2被电子还原生成的自由基点O2−一起直接降解污染物。总之，本工作为化学键合BiOX/Bioy(X，Y=AlCl，BrI)/rGO纳米复合材料的合成提供了很好的参考，有助于促进其在环境保护和光电转换方面的应用。
50%BiOCl/BiOI/reduced graphene oxide (50%BiOCl/BiOI/rGO) composite photocatalyst was synthesized successfully by a facile one-step solvothermal route in this work. Reduction of graphene oxide (GO) took place in the process of solvothermal reaction and a new Bi-C bond between rGO and 50%BiOCl/BiOI was formed. The introduction of rGO affected the morphology of 50%BiOCl/BiOI, resulting in the transformation of 50%BiOCl/BiOI from solid microspheres to hollow microspheres. Both the introduction of rGO and formation of 50%BiOCl/BiOI hollow microspheres can facilitate the light absorption. The strong interaction between 50%BiOCl/BiOI and rGO and the electrical conductivity of rGO greatly improved the effective separation of photogenerated carriers. Hence, GOB-5 demonstrated the highest photocatalytic activity which was over twice of the pristine 50%BiOCl/BiOI in the presence of visible light. Mechanism study revealed that 50%BiOCl/BiOI generated electrons and holes in the presence of visible light, and holes together with radical dotO2−generated from reduction of O2by electrons degraded the pollutant directly. Overall, this work provides an excellent reference to the synthesis of chemically bonded BiOX/BiOY (X, Y = Cl, Br, I)/rGO nanocomposite and helps to promote their applications in environmental protection and photoelectric conversion.