摘要
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 interacts 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 photocatalytic activity compared with pure TiO2 due to enhanced quantum efficiency, narrowed band gap, and perfect textural properties.
出处
《催化学报》
SCIE
CAS
CSCD
北大核心
2012年第12期1974-1981,共8页
基金
国家自然科学基金(21165013
51208248)
江西省自然科学基金(2010GZH0112)
江西省科技支撑计划(2010BSB03100)
江西省青年科学基金(20114BAB213015)
江西省教育厅青年科学基金(GJJ12456)
南昌航空大学博士启动基金(EA201002219)~~
关键词
石墨烯
二氧化钛
银
金
溶剂热还原
光还原
罗丹明B
甲基橙
graphene
titania
silver
gold
solvothermal reduction
photoreduction
rhodamine B
methyl orange