Graphene-TiO2 Composite Photocatalyst with Enhanced Photocatalytic Performance

Here we used a hydrothermal process and calcination in the absence of O2 to obtain a highly efficient chemically bonded graphene-TiO2 nanocomposite photocatalyst utilizing graphene oxide and tetra-n-butyl titanate as precursors. The nanocomposite photocatalyst could inhibit the recombination of photo-generated electron-hole pairs of TiO2 and then enhanced the photocatalytic efficiency. The results presented by transmission electron microscope, X-ray diffraction, Raman microscopy, and X-ray photoelectron spectroscopy showed that anatase TiO2 particles attached on the surface of the film-shaped graphene. The photocatalytic capability of graphene-TiO2 catalyst under UV light was evaluated and the results showed that graphene-TiO2 had good stability and better photocatalytic ability than pure TiO2 prepared by similar method. The holes governed the photocatalytic process and the photocatalytic performance of this photocatalyst was improved at high pH value.

摘要以石墨烯氧化物和钛酸四丁酯为原料, 通过水热法、无氧煅烧转晶合成了 graphene-TiO2 复合催化剂, 并采用透射电镜、X 射线衍射、拉曼光谱和 X 射线光电子能谱等手段对其进行了表征. 结果表明, TiO2 全部为锐钛矿晶型, 呈纳米颗粒状附着在薄膜状的 graphene 表面. 以亚甲基蓝为目标物, 评价了 graphene-TiO2 催化剂的光催化性能. 结果表明, graphene-TiO2 的光催化降解能力明显优于相同方法制备的纳米 TiO2 颗粒, 且具有较好的稳定性, 空穴在降解过程中起主要作用, 碱性溶液更有利于催化剂对 MB 的降解.

The chemically bonded graphene-TiO2 nanocomposite photocatalyst was a more stable and better photocatalyst than pure TiO2. The holes governed the photocatalytic process and the photocatalytic performance of this photocatalyst was improved at high pH value.Figure optionsDownload as PowerPoint slide