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采用改进的Hummers法制备氧化石墨烯,在此基础上以该GO为载体,通过浸渍-沉淀法在其表面合成TiO2纳米粒子,再通过450℃的焙烧形成TiO2/GO二元复合光催化剂,研究复合光催化剂在紫外光下降解甲基橙的动力学及活性变化规律。使用透射电子显微镜(TEM)、高分辨透射电子显微镜(HRTEM)和紫外可见漫反射光谱等分析了复合光催化剂的形貌、TiO2粒子的结晶状态以及催化剂的光吸收。结合光催化降解甲基橙实验,探索了复合光催化剂中TiO2含量对其光催化活性的影响。研究结果表明,在TiO2质量分数低于20%时,复合光催化剂中TiO2均匀分散于GO表面;质量分数超过20%复合催化剂中将会有少量TiO2团聚体出现。由于氧化石墨烯的协同效应,紫外光下TiO2/GO复合催化剂的光催化活性要远高于TiO2光催化剂。
The modified Hummers method was used to prepare graphene oxide. On the basis of this, GO was used as a support to synthesize TiO2 nanoparticle on the surface of the nanoparticle by impregnation-precipitation method. Then TiO2 / GO binary composite photocatalyst was formed by calcination at 450 ℃. Kinetics and Activity Variation of Composite Photocatalyst Degrading Methyl Orange in Ultraviolet Light. The morphologies of the composite photocatalysts, the crystalline state of TiO2 particles and the light absorption of the catalysts were analyzed by transmission electron microscopy (TEM), high resolution transmission electron microscopy (HRTEM) and UV-visible diffuse reflectance spectroscopy. Combined with the photocatalytic degradation of methyl orange, the photocatalytic activity of TiO2 photocatalyst was explored. The results show that when the mass fraction of TiO2 is less than 20%, the TiO2 in the composite photocatalyst is uniformly dispersed on the surface of GO. Small amount of TiO2 agglomerates will appear in the composite catalyst with the mass fraction of more than 20%. Due to the synergistic effect of graphene oxide, the photocatalytic activity of TiO2 / GO composite catalyst under UV light is much higher than that of TiO2 photocatalyst.