二氧化钛-石墨烯复合物的制备及其光催化性质

Synthesis of TiO_2-Graphene Composite for Using as a Photocatalyst

以氧化石墨和商业用二氧化钛为前驱物,在150℃水热条件下制备了二氧化钛-石墨烯复合物,利用XRD、Raman、SEM、TEM和低温N2吸附-脱附测试对复合物的结构和形貌进行了表征。以亚甲基蓝溶液模拟染料废水,研究了二氧化钛-石墨烯复合物在紫外光及可见光下的光催化效果,结果表明,该复合物的光催化性能较之商业用二氧化钛有较大提高。对光催化机理的研究表明,二氧化钛-石墨烯复合物光催化性能提高的原因是其对于染料分子的吸附能力提高、吸光能力增强,并且复合物中电荷分离效率也有很大提高。

TiO2 graphene composite was obtained by a one step hydrothermal method, using graphite oxide and commercial TiO2 as precursors. The morphology and structure of the composite were examined by scanning electron microscopy, transition electron microscopy, X-ray diffraction, N2 adsorption-desorpti0n and Raman spectrum. The as-prepared TiO2-graphene photocatalyst possessed great adsorptivity of dyes, extended light absorption range, and efficient charge separation properties. Hence, in the photodegradation of methylene blue, a significant enhancement in efficiency was observed with TiO2-graphene compared to the neat TiO2.