Alternative method for preparation of Au/TiO2 with precise Au0/Au+
Alternative method for preparation of Au/TiO2 with precise Au0/Au+
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精密 Au-0/Au 制备 Au/TiO2 的替代方法
DOI：
10.1002/jctb.4815
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发表时间：
2016-07-01
影响因子：
3.4
通讯作者：
Li, Qingbiao
中科院分区：
文献类型：
--
作者：
Du, Mingming;Huang, Jiale;Li, Qingbiao
背景金催化剂的价态被认为是衡量其催化CO氧化活性的重要参数。结果采用生物合成法和沉积-沉淀法相结合的方法制备了Au-0/Au+摩尔比可调的Au/TiO2光催化剂，并用XPS、TEM、Druv-Vis等技术对其进行了表征。首先，将生物合成的金属Au纳米颗粒固定在Ti02载体上，得到不同Au负载量、相同大小的Au纳米颗粒催化剂。然后用DP法将正电离的Au物种负载到上述Au/TiO2型催化剂上。金属Au和正电离Au物种可以完全负载在载体上。因此，可以精确地控制Au-0/Au+的摩尔比。与金属Au和正电离Au物种的催化剂相比，Au/TiO21：1催化剂的初始催化活性最好，这是由于Au-0和Au+的共存而提高了催化性能。结论本研究证实了生物合成和DP法相结合的方法可以制备出准确的Au-0/Au+摩尔比的Au/TiO2光催化剂。(C)2015年化学工业学会
BACKGROUNDAu valence for Au catalysts has been considered a vital parameter for catalytic activity towards CO oxidation. However, there is no effective method to prepare precise Au-0/Au+ molar ratios with the same Au nanoparticles (NPs) sizes.RESULTSA series of Au/TiO2 catalysts with tuneable Au-0/Au+ molar ratios were prepared by the combination of a biosynthesis method and a deposition-precipitation (DP) method, and characterized by XPS, TEM, DRUV-Vis techniques. First, biosynthesized metallic Au NPs were immobilized onto TiO2 supports to obtain Au/TiO2 catalysts with different Au loadings but with the same sized Au NPs. And then positively ionized Au species were supported onto the above Au/TiO2 catalysts by a DP method. The metallic Au and positively ionized Au species could be totally supported on the support. Therefore, the Au-0/Au+ molar ratios could be controlled exactly. Compared with Au/TiO2 catalysts with metallic and positively ionized Au species alone, the catalyst Au/TiO2-1:1 showed the best initial catalytic activity, suggesting enhanced catalytic performance due to the coexistence of Au-0 and Au+.CONCLUSIONThis study verifies that Au/TiO2 catalysts with accurate Au-0/Au+ molar ratios can be prepared by a combination of biosynthesis and a DP method. (c) 2015 Society of Chemical Industry