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论文类型：期刊论文

发表时间：2019-06-30

发表刊物：APPLIED SURFACE SCIENCE

收录刊物：SCIE、EI

卷号：480

页面范围：105-114

ISSN号：0169-4332

关键字：Ag/GO-TMCs; Photoreduction deposition; Photocatalysis; Organic pollutants degradation

摘要：Nanosized metallic Ag particles modified graphene oxide-TiO2 mesocrystals (Ag/GO-TMCs) were successfully synthesized by photoreduction deposition method. The morphology, crystallization, structural features and chemical compositions of the as-prepared Ag/GO-TMCs catalysts were investigated using HRTEM, XRD, Raman spectra, XPS, UV-vis DRS, PLS, and N-2 adsorption-desorption measurements. Ag nanoparticles were found to be evenly distributed on the surface of TiO2 mesocrystals (TMCs) and graphene oxide (GO). The Ag/GO-TMCs catalysts featured high crystallinity, abundant mesoporous structure, large surface area, and improved visiblelight response. Photocatalytic applications of the catalysts for degradation of Rhodamine B (RhB) and dinitro butyl phenol (DNBP) under visible light irradiation were investigated. The results showed that the highly enhanced photocatalytic activity was obtained with Ag/GO-TMCs catalysts. The Ag/GO-TMCs photocatalyst with AgNO3/GO-TMCs mass ratio of 0.075: 1 exhibited the highest photocatalytic degradation of RhB and DNBP under 3 h of visible light irradiation. The superior photocatalytic activity of Ag/GO-TMCs may be attributed to the higher visible-light absorbance ability and surface plasmon resonance (SPR) effect of Ag nanoparticles and GO. The Ag-GO/TMCs materials could be deemed as promising photocatalysts for organic contaminants removal under visible light irradiation, in assessing their high photocatalytic efficiency and good repeatability.