分别采用溶剂热还原和光还原沉积法制备了石墨烯-TiO2和 Ag(Au)/石墨烯-TiO2复合光催化剂,并表征了其相结构、形貌、孔隙率、光谱吸收性质以及组成结构.结果表明,石墨烯与 TiO2通过 C–O–Ti 共价键相互作用, Ag 或 Au 纳米粒子均匀沉积在石墨烯和 TiO2表面.在模拟太阳光照射下,通过对水相中罗丹明 B 和甲基橙的降解,考察了光催化剂活性的差异,并研究了其降解动力学.结果表明,由于量子效率的提高、带隙能的降低以及织构性质的优化,复合光催化剂表现出比纯 TiO2更高的光催化活性.
To improve the solar utilization efficiency of TiO2, the graphene-TiO2 and Ag(Au)/graphene-TiO2 composite photocatalysts were prepared by solvothermal reduction and photoreduction deposition technique, respectively. The phase structure, morphology, porosity, optical absorption property as well as composition and structure of as-prepared materials were characterized. The results indicated that TiO2 inter-acts with graphene via Ti–O–C covalent bonds and Ag or Au nano-particles evenly deposite on the graphene and TiO2 surface. The photo-catalytic activity and degradation kinetics of the as-prepared photocatalysts were studied by the degradation of aqueous rhodamine B and methyl orange under solar simulating Xe lamp irradiation. The results indicated that the composite photocatalysts exhibit higher photocata-lytic activity compared with pure TiO2 due to enhanced quantum efficiency, narrowed band gap, and perfect textural properties.
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