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Ag/K_4Nb_6O_(17)异质结催化剂的制备、光谱分析及光催化性能研究
作者姓名:Zhang FL  Cao YN  Ying S  Chen R  Zhang HH  Zheng Q
作者单位:1. 国家化学工业气体产品质量监督检验中心,福建,福州,350025
2. 福州大学化肥催化剂国家工程研究中心,福建,福州,350002
基金项目:国家自然科学基金项目,福建省重大专项项目 
摘    要:采用低温水热法成功制备了层状的K4Nb6O17半导体光催化材料。考虑到水热合成的K4Nb6O17表面多羟基(Nb—OH)和端氧(Nb O,Nb—O-)的特点,采用Ag(en)2+配合物前驱体法制备了高度均匀分散的Ag/K4Nb6O17异质结光催化剂,光催化性能评价结果表明,半导体K4Nb6O17表面负载极少量的Ag,其光催化降解甲基橙活性便得到大幅度提高,Ag的最佳负载量为0.5 at%。综合XRD,FTIR,UV-VisDRS,XRF和TEM表征结果,对Ag/K4Nb6O17异质结光催化剂的作用机制进行了较详细地阐述并获得如下结论:(1)K4Nb6O17提供了降解有机染料分子的电子和空穴;(2)K4Nb6O17纳米晶上Ag粒子作为光生电子接受器,促进了金属-半导体界面上电荷的转移,有效地分离了光生电子-空穴对,提高了光催化活性。

关 键 词:异质结  Ag/K4Nb6O17催化剂

Synthesis, spectral analysis and photocatalysis of Ag/K4Nb6,O17 heterojunction catalysts
Zhang FL,Cao YN,Ying S,Chen R,Zhang HH,Zheng Q.Synthesis, spectral analysis and photocatalysis of Ag/K4Nb6,O17 heterojunction catalysts[J].Spectroscopy and Spectral Analysis,2010,30(10):2636-2640.
Authors:Zhang Feng-li  Cao Yan-ning  Ying Song  Chen Rong  Zhang Han-hui  Zheng Qi
Institution:China National Chemical Industrial Gas Quality Supervision and Inspection Center, Fuzhou 350025, China. flizhang@hotmail.com
Abstract:K4Nb6O17 photocatalyst was successfully synthesized by low-temperature hydrothermal method with layer structure. Considering that a large number of hydroxyl (Nb-OH) and oxygen species (Nb==O, Nb--O-) exist on the surface of K4Nb6O17 synthesized by hydrothermal method, Ag(en)2+ precursors were employed to synthesize Ag/K4Nb6O17 heterostructure photo-catalysts with highly dispersed Ag. Photocatalytic performance evaluation results show that the photodegradation rate of MO for K4Nb6O17 was remarkably improved when a small amont of Ag was loaded. The best loading dose of Ag is 0.5 at%. Based on various characterizations results of XRD, FTIR, UV-Vis DRS, XRF and TEM, the photocatalytic mechanism of Ag/ K4Nb6O17 heterostructure catalysts was illuminated in detail and the conclusions were drawn as follows: (1) K4Nb6O17 nanocrystals serve as electron and hole sources for degradation of an organic dye; (2) Ag nanoparticles on the surface of K4Nb6O17 nanocrystals act as a sink for the electrons, promote interfacial charge-transfer kinetics between the metal and semiconductor, improve the separation of photogenerated electron-hole pairs, and thus enhance the photocatalytic activity of Ag/K4Nb6O17 photocatalyst.
Keywords:FTIR  UV-Vis DRS
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