Fabrication of Fe3O4@graphene/TiO2 nanohybrid with enhanced photocatalytic activity for isopropanol degradation

Fabrication of Fe3O4@graphene/TiO2 nanohybrid with enhanced photocatalytic activity for isopropanol degradation
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Fe3O4@石墨烯/TiO2纳米杂化物的制备,具有增强的异丙醇降解光催化活性

DOI:
10.1016/j.jallcom.2019.03.378
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发表时间:
2019-07
影响因子:
6.2
通讯作者:
Wang Defa
Wang Defa
中科院分区:
材料科学2区
文献类型:
--
作者:
Tan Jiahan;Wang Xin;Hou Weishu;Zhang Xueliang;Liu Lequan;Ye Jinhua;Wang Defa

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我们报道了一种简单的两步水热法制备Fe3O4@graphene/TiO 2(F@G/TiO 2)纳米杂化材料。与二元石墨烯/TiO 2(G/TiO 2)或纯TiO 2相比,三元F@G/TiO 2纳米杂化材料表现出明显改善的光催化降解异丙醇(IPA)的性能,(0.4wt%Fe3O4和0.2wt%石墨烯)获得最高活性(262.5 μmoL/h用于丙酮释放; 28.8 μmoL/h用于CO2释放)。在F@G/TiO 2纳米杂化材料中,Fe 3 O 4产生的磁场和石墨烯优异的导电性促进了TiO 2中光生电子和空穴的分离和传输.结果表明,F@G/TiO 2纳米杂化材料的光催化活性明显提高,这可能是由于F@G/TiO 2纳米杂化材料的光催化活性增强的原因。机理研究表明,O2·−和空穴是光催化降解IPA的主要活性氧物种。
We report on the fabrication of a Fe3O4@graphene/TiO2(F@G/TiO2) nanohybrid using a facile two-step hydrothermal method. Compared with either the binary graphene/TiO2(G/TiO2) or pure TiO2, the ternary F@G/TiO2nanohybrid exhibited an apparently improved performance for photocatalytic isopropanol (IPA) degradation, and the sample F1@G/TiO2(0.4 wt% Fe3O4and 0.2 wt% graphene) achieved the highest activity (262.5 μmoL/h for acetone evolution; 28.8 μmoL/h for CO2evolution) under an AM 1.5G solar simulator irradiation. In the F@G/TiO2nanohybrid, the magnetic field arisen from Fe3O4and the excellent electrical conductivity of graphene were believed to facilitate the separation and transport of photoinduced electrons and holes in TiO2. As a consequence, the synergetic effect could account for the enhanced photocatalytic activity of F@G/TiO2nanohybrid. Mechanistic study indicated that O2•−and hole were the main reactive oxygen species for photocatalytic IPA degradation.
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