文献类型：期刊文献

英文题名：TiO₂ Nanoflakes Modified with Gold Nanoparticles as Photocatalysts with High Activity and Durability under near UV Irradiation

作者：Liu, Yong[1,2];Chen, Lifang[3];Hu, Juncheng[1,2];Li, Jinlin[1,2];Richards, Ryan[4]

机构：[1]S Cent Univ Nationalities, Key Lab Catalysis & Mat Sci, State Ethn Affairs Commiss, Wuhan 430074, Peoples R China;[2]S Cent Univ Nationalities, Minist Educ, Wuhan 430074, Peoples R China;[3]E China Univ Sci & Technol, State Key Lab Chem Engn, Shanghai 200237, Peoples R China;[4]Colorado Sch Mines, Dept Chem & Geochem, Golden, CO 80401 USA

年份：2010

卷号：114

期号：3

起止页码：1641

外文期刊名：JOURNAL OF PHYSICAL CHEMISTRY C

收录：;WOS:【SCI-EXPANDED(收录号:WOS:000273672500035)】；

基金：This work is supported by National Natural Science Foundation of China (20803096), South-Central University for Nationalities (YZZ08002, KYCX090004E), and Colorado School of Mines.

语种：英文

摘要：Titania nanoflakes modified with gold nanoparticles (NPs) were successfully prepared by depositing of Au NPs onto TiO2 nanoflakes using a direct "green" process in the absence of organic capping agents. The photocatalyst has been characterized by transmission electron microscopy, X-ray photoelectron spectroscopy, X-ray diffraction, and UV-vis diffuse reflectance spectroscopy. Results of these analyses revealed that the Au NPs (similar to 1 nm) are homogeneously dispersed on the surface of highly crystalline TiO2 (anatase) nanoflakes with a narrow size distribution. Further, XPS studies indicate a strong electronic interaction between Au (in metallic state) and TiO2. Inspiringly, the photocatalyst showed high-efficiency and ultrastability for the degradation of the nonbiodegradable azo dye brilliant red X-3B tinder near UV irradiation with activity 4.3 times higher than that exhibited by the commercial Degussa P25. Durability tests established that the catalyst remains intact even after 15 consecutive experiments. The ultrafine metal particle size and strong metal-support interaction were considered as the key factors for the overall photocatalytic activity of the metal-semiconductor composite system.