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以氧化石墨烯为载体,以钛酸异丙酯为前驱体在氧化石墨烯表面沉积TiO2晶种,然后以氟钛酸铵和硼酸为主要原料,采用水热法实现一步还原氧化石墨烯和沉积TiO2制备石墨烯/TiO2复合物,同时以由单一前驱体氟钛酸铵制备的石墨烯/TiO2复合物作为对比催化剂。采用SEM、Raman、XRD、XPS、FT-IR等分析手段对两种催化剂进行了表征。结果表明,经水热反应后,氧化石墨烯可被还原为石墨烯,并且由两种钛源制备的复合物中石墨烯的被还原程度比单一钛源水解的要高,并且水解后复合催化剂的TiO2均为锐钛矿的球形颗粒,粒径约为250~300nm,在石墨烯表面附着良好。采用甲基橙为模拟底物评价两种复合催化剂的光催化活性,结果发现,采用两种钛源依次水解制备的复合物中由于石墨烯的还原度更高,其对底物甲基橙的吸附量更高,转移TiO2表面光生电子的能力更强,导致其具有更强的光催化活性。
Using graphene oxide as carrier and titanate titanate as precursor, TiO2 seeds were deposited on the surface of graphene oxide. Then, using hydrofluoric acid and boric acid as the main raw materials, one-step reduction of graphene oxide and deposition The graphene / TiO2 composites were prepared by TiO2, while the graphene / TiO2 composites prepared by a single precursor of ammonium fluorotitanate were used as the comparative catalysts. The catalysts were characterized by SEM, Raman, XRD, XPS and FT-IR. The results show that graphene oxide can be reduced to graphene after hydrothermal reaction, and the graphene in the composite prepared from the two titanium sources is reduced more than the single titanium source, and the hydrolyzed composite catalyst Of TiO2 are spherical particles of anatase, particle size of about 250 ~ 300nm, good adhesion on the surface of graphene. The photocatalytic activity of the two composite catalysts was evaluated by using methyl orange as a simulated substrate. The results showed that graphene had higher reducibility in the composite prepared by hydrolysis of two titanium sources, The higher the adsorption capacity, the stronger the photocatalytic activity is.