Graphene-TiO2 Composite Photocatalyst with Enhanced Photocatalytic Performance

Abstract

Here we used a hydrothermal process and calcination in the absence of O 2 to obtain a highly efficient chemically bonded graphene-TiO 2 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 TiO 2 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 TiO 2 particles attached on the surface of the film-shaped graphene. The photocatalytic capability of graphene-TiO 2 catalyst under UV light was evaluated and the results showed that graphene-TiO 2 had good stability and better photocatalytic ability than pure TiO 2 prepared by similar method. The holes governed the photocatalytic process and the photocatalytic performance of this photocatalyst was improved at high pH value. 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-TiO 2 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, TiO 2 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-TiO 2 催化剂的光催化性能. 结果表明, graphene-TiO 2 的光催化降解能力明显优于相同方法制备的纳米 TiO 2 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-TiO 2 nanocomposite photocatalyst was a more stable and better photocatalyst than pure TiO 2 . The holes governed the photocatalytic process and the photocatalytic performance of this photocatalyst was improved at high pH value.