Decomposition of Formaldehyde Based On Gold-Coated TiO2 Nanoparticles
The synthesis of gold nanoparticles caped with visible light-responsible Ti02 nanoparticles was prepared by using electrochemical oxidation-reduction cycles (ORC) in 0.1 M HCl aqueous solution containing 60 mM visible light-responsible TiO2 nanoparticles. First, an Au substrate was cycled in a deoxygenated aqueous solution containing 0.1 M HCl and 60 mM anatase TiO2 nanoparticles from -0.28 to +1.22 V vs Ag/AgCl at 500 mV/s with 25 scans. The durations at the cathodic and anodic vertexes are 10 and 5 s, respectively. After this process, Au-and TiO2-containing complexes were left in the solution. Then a Pt electrode immediately replaced the Au working electrode, and a cathodic overpotential of 0.6 V from the open circuit potential (OCP) was applied under sonification to synthesize Au nanoparticles. Encouragingly, the prepared Au nanoparticles caped with visible light-responsible TiO2 nanoparticles are more active for the decomposition of formaldehyde than pure visible light-responsible TiO2 nanoparticles are in the same condition. After 5 days testing, the formaldehyde was decomposed ca. 35 ％ in containing Au nanoparticles caped with visible light-responsible TiO2 nanoparticles, but the formaldehyde was decomposed only ca. 25 ％ in containing pure visible light-responsible TiO2 nanoparticles.
Chung-Chin Yu Yu-Chuan Liu Wen-Hui Chiu
Department of Environmental Engineering,Vanung University, 1, Van Nung Road, Shuei-Wei Li, Chung-Li Department of Chemical and Materials Engineering,Vanung University, 1, Van Nung Road, Shuei-Wei Li,
国际会议
天津
英文
88-93
2007-07-17（万方平台首次上网日期，不代表论文的发表时间）