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首页> 外文期刊>Chemistry: A European journal >In situ growth of TiO_2 in interlayers of expanded graphite for the fabrication of TiO_2-graphene with enhanced photocatalytic activity
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In situ growth of TiO_2 in interlayers of expanded graphite for the fabrication of TiO_2-graphene with enhanced photocatalytic activity

机译：在膨胀石墨中间层中原位生长TiO_2以制备具有增强光催化活性的TiO_2-石墨烯

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摘要

We present a facile route for the preparation of TiO_2-graphene composites by in situ growth of TiO_2 in the interlayer of inexpensive expanded graphite (EG) under solvothermal conditions. A vacuum-assisted technique combined with the use of a surfactant (cetyltrimethylammonium bromide) plays a key role in the fabrication of such composites. Firstly, the vacuum environment promotes full infusion of the initial solution containing Ti(OBu)4 and the surfactant into the interlayers of EG. Subsequently, numerous TiO_2 nanoparticles uniformly grow in situ in the interlayers with the help of the surfactant, which facilitates the exfoliation of EG under the solvothermal conditions in ethanol, eventually forming TiO _2-graphene composites. The as-prepared samples have been characterized by Raman and FTIR spectroscopies, SEM, TEM, AFM, and thermogravimetic analysis. It is shown that a large number of TiO_2 nanoparticles homogeneously cover the surface of high-quality graphene sheets. The graphene exhibits a multi-layered structure (5-7 layers). Notably, the TiO_2-graphene composite (only 30wt % of which is TiO_2) synthesized by subsequent thermal treatment at high temperature under nitrogen shows high photocatalytic activity in the degradation of phenol under visible and UV lights in comparison with bare Degussa P25. The enhanced photocatalytic performance is attributed to increased charge separation, improved light absorbance and light absorption width, and high adsorptivity for pollutants.
机译：我们提出了一种通过在溶剂热条件下在廉价膨胀石墨（EG）中间层中原位生长TiO_2来制备TiO_2-石墨烯复合材料的简便方法。真空辅助技术与表面活性剂（十六烷基三甲基溴化铵）的组合使用在此类复合材料的制造中起着关键作用。首先，真空环境促进了含有Ti（OBu）4和表面活性剂的初始溶液完全浸入EG的中间层。随后，在表面活性剂的帮助下，大量的TiO_2纳米颗粒均匀地在中间层中生长，这促进了在溶剂热条件下EG在乙醇中的剥落，最终形成了TiO_2-石墨烯复合材料。所制备的样品已通过拉曼光谱和FTIR光谱，SEM，TEM，AFM和热重分析进行了表征。结果表明，大量的TiO_2纳米颗粒均匀地覆盖了高质量石墨烯片的表面。石墨烯表现出多层结构（5-7层）。值得注意的是，与裸露的德固赛（Degussa）P25相比，在可见光和紫外光下通过在氮气下高温下的后续热处理合成的TiO_2-石墨烯复合物（其中只有30wt％为TiO_2）在酚的降解中显示出高的光催化活性。增强的光催化性能归因于电荷分离增加，光吸收率和光吸收宽度提高以及对污染物的高吸附性。

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