中文摘要：

近年来随着人们对环保要求越来越高,以二氧化钛为代表的光催化剂得到了快速发展。其中石墨烯修饰的二氧化钛复合光催化剂引起了科学界的广泛关注。因石墨烯具有巨大的比表面积和良好的电子传输能力,可以同时充当二氧化钛纳米颗粒的载体和光生电子的快速输运通道。该课题采用化学气相沉积制备的三维网状石墨烯与二氧化钛通过水热法结合,制备高性能的复合光催化剂。实验结果显示,此复合光催化剂的比表面积达到390 m^2·g^-1,表明其对污染物分子具有良好的吸附能力。在紫外光照射下,甲基橙的降解速率达到8.1×10^-2min^-1,比采用本征纳米二氧化钛作为催化剂时提高了200%。在可见光照射下,污染物的降解速率也高达2.8×10^-2min^-1。并且此复合催化剂具有良好的稳定性,反复使用10次后其降解污染物的速率没有明显下降,表明其具有良好的应用前景。

英文摘要：

With the gradually increased environmental a hot issue. The Ti02 composite photocatalyst modified protection standard, the TiO2 based photocalalyst becomes by graphene has attracted more and more attention due to the large BET area and excellent electron transport ability of graphene, which endows the graphene not only acting as cartier for TiO2 nanoparticles, but also rapid electron transport network for the resulting composites. In this study, three-dimensional network graphene prepared by chemical vapor deposition approach was adopted to prepare composite photocatalyst with TiO2 via hydrothermal progress. The BET area of the fabricated photocatalyst is as high as 390 m2 ·g-1, indicating outstanding absorbility for the pollution molecules. The degradation rate constant of methyl orange reaches 8.1×10^-2 min-1 and 2.8×10^-2 min-1 under UV-light and visible-light irradiation, respectively. The rate constant under UV-light irradiation is 200% higher than that of using pure TiO2. Moreover, the photocatalyst displays favorable stability after 10 cycle use, manifesting promising application prospect.