物理学报Issue(7)：1-8,8.DOI:10.7498/aps.64.078102
SnO2量子点/石墨烯复合结构的合成及其光催化性能研究
Synthesis of SnO2 quantum dots/graphene composite and its photocatalytic performance
摘要
Abstract
With SnCl4·5H2O and graphene oxide as raw materials and aqueous solution of ethanol as the solvent, we have prepared SnO2 quantum dots (diameter about 3–5 nm)/graphene nanocomposites using a facile hydrothermal method in one step, and solved the reunion of quantum dots successfully. The visible-light-driven photocatalytic efficiency of SnO2 quantum dots depends to a great extent on their dispersity. Because of the large-sized two-dimensional surface, the graphene sheet could behave as a solid support for quantum dots through interfacial interaction to avoid particle aggregation. Composites of SnO2 quantum dot/graphene show a great photocatalytic performance in visible light, and the morphology and structure of the product are characterized by X-ray powder diffraction (XRD), transmission electron microscopy (TEM), high-resolution transmission electron microscopy (HRTEM), Fourier transform infrared Spectrometer (FT-IR) and other techniques. The optical properties are investigated by using UV-visible (UV-vis) absorption spectrum. Additionally, the photocatalytic activity of the product is measured by the degradation of rhodamine-B dye solution in visible light. Results show that the preparation of samples with high catalytic activity in visible light, the shift in the optical response of composites may produce a positive effect on the improvement of photocatalytic efficiency in UV to visible spectral range Moreover, owing to its special π-conjugation structure, large specific surface area as well as high conductivity, graphene can enhance the photocatalytic activity. Compared with the pure SnO2, pure graphene catalytic performance is greatly improved in visible light, its excellent photocatalytic activity is due to the combination of strong absorption and effective separation of photogenerated carriers in the samples. Finally, the formation mechanism of the composite and its photocatalytic mechanism are studied.关键词
氧化锡/石墨烯/可见光光催化/罗丹明-BKey words
tin oxide/graphene/photocatalytic/rhodamine B引用本文复制引用
叶鹏飞,陈海涛,卜良民,张堃,韩玖荣..SnO2量子点/石墨烯复合结构的合成及其光催化性能研究[J].物理学报,2015,(7):1-8,8.基金项目
国家自然科学基金(批准号:10647144,11004170)资助的课题 （批准号:10647144,11004170）
