Pt-TiO2/Graphene Nanocomposite Degradation of AO7 dye under Visible light

• Main Authors: Chun-Te Wu, 吳俊德
• Other Authors: Wen-Jauh Chen
• Format: Others
• Language: zh-TW
• Published: 2014
• Online Access: http://ndltd.ncl.edu.tw/handle/72916752691141655221

碩士 === 國立雲林科技大學 === 材料科技研究所 === 103 === Pt/TiO2-graphene nanocomposites used as photocatalyst were prepared by a hydrothermal process using graphene oxide, titanium tetrachloride, and sodium borohydride as precursors of the TiO2/graphene. Then a given amount of hexachloroplatinic acid were added in TiO2/graphene solution and stirred for 20 h. After this, the samples calcined at 500 oC for 1 hr to obtain Pt-doped TiO2-graphene nanocomposites. Compared to undoped TiO2, the absorption edge of Pt/TiO2-graphene composites shifted to 435 nm in visible range with Pt doping TiO2, PtO, PtO2 and graphene incorporation. The prepared Pt/TiO2-graphene nanocomposite catalysts showed enhanced photocatalytic activity than pure TiO2 under visible-light irradiation for AO7 degradation. The higher photocatalytic activity of the nanocomposite catalysts could be attributed to extended light absorption, efficient charge separation, enhanced adsorptivity, and the photoformed electrons can easily produce more OH radicals and superoxide radical anion. Pt/TiO2-graphene nanocomposites exhibits the highest efficiency at the mass ratio of H2PtCl6 :TiCl4 :GO = 10:100:1. 99.11% of AO7 is decomposed under 6 hr visible light irradiation.