摘要
以天然鳞片石墨为原料,采用改进的Hummers法并结合水热法制备TiO2-石墨烯(TiO2-rGO)复合光催化材料。采用TEM,XRD,Raman,FTIR和UV-VIS DRS等方法对其特性进行了表征,以光催化降解亚甲基蓝(MB)研究了石墨烯的引入对TiO2纳米材料光催化性能的影响。结果表明,TiO2纳米颗粒均匀分布在石墨烯表面,并通过Ti—O—C键与石墨烯紧密结合;与石墨烯结合的TiO2在紫外和可见光区吸收明显增强,吸收边发生了红移;当石墨烯的质量分数为10%时,TiO2-rGO复合材料在紫外光和可见光照下,对MB降解120 min的降解率分别达到90.4%和75.9%,其光催化能力与TiO2相比有明显提高。
The graphene oxide （GO） was prepared from the flake graphite by modified Hummers＂ method. The composites of TiO2-rGO were synthesized by one-step hydrothermal method. The physical and chemical properties of the products were characterized by the transmission electron microscopy （TEM）, X-ray diffraction （XRD）, Raman spectra, Fourier transform infrared spec- troscopy （FTIR）, ultraviolet-visible diffuse reflectance spectroscopy （UV-VIS DRS）. And the influence of the introduction of graphene on the photocatalytic activity of TiO2 nanomaterials was investigated with the degradation of methylene blue （MB） experiments under the UV light and visible light. The results indicate that the TiO2 nanoparticles are well-dispersed and contacted closely with the surface of graphene sheets via the formation of Ti--O--C bonds; the absorption intensity significantly increases both in the UV and visible light region, and the absorption edges of the as-synthesized TiO2-rGO nanocomposites show red-shift to higher wavelength; when the mass fraction of rGO is 10% and the degradation time is 120 rain, the degradation rates of the composites of TiO2-rGO for MB are 90.4% and 75.9% under the UV light and visible light, re- spectively, which are significantly higher than those of the pure TiO2.
出处
《微纳电子技术》
CAS
北大核心
2014年第4期219-223,242,共6页
Micronanoelectronic Technology
基金
国家自然科学基金资助项目(21207041)
华南农业大学"211工程"三期重点建设项目(2009B010100001)
