Synthesis of Au-ZnO and Pt-ZnO nanocomposites by one-step flame spray pyrolysis and its application for photocatalytic degradation of dyes
Synthesis of Au-ZnO and Pt-ZnO nanocomposites by one-step flame spray pyrolysis and its application for photocatalytic degradation of dyes
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DOI：
10.1016/j.catcom.2009.03.002
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发表时间：
2009-05-20
影响因子：
3.7
通讯作者：
Panpranot, Joongjai
中科院分区：
文献类型：
--
作者：
Pawinrat, Pongsapak;Mekasuwandumrong, Okorn;Panpranot, Joongjai
采用一步火焰喷雾热分解法（FSP）制备了Au-ZnO和Pt-ZnO纳米复合材料，并通过X射线衍射（XRD）、氮吸附、紫外-可见光谱、光致发光（PL）和透射电子显微镜（TEM）对其进行了表征。XRD和TEM结果表明，在火焰合成过程中，Au和Pt金属相的形成是在ZnO形成后的后期。它们的平均颗粒/簇尺寸范围在3和7 nm之间，这取决于负载量（1和3重量%）。虽然FSP衍生的Au-ZnO和Pt-ZnO两者具有相似的物理性质（即，微晶尺寸和比表面积），与纯ZnO和商业二氧化钛光催化剂（JRC-TiO 2和P-25）相比，仅观察到Au-ZnO而不是Pt-ZnO的亚甲基蓝光催化降解的改善，这可能是由于Au和Pt之间的费米能级平衡类型不同。(C)2009爱思唯尔有限公司版权所有。
Au-ZnO and Pt-ZnO nanocomposites have been synthesized by one-step flame spray pyrolysis (FSP) and characterized by X-ray diffraction (XRD), nitrogen adsorption, UV-vis spectroscopy, photoluminescence (PL), and transmission electron microscopy (TEM). The XRD and TEM results revealed that Au and Pt metallic phase were formed late during flame synthesis after ZnO was formed. Their average particle/cluster sizes were ranged between 3 and 7 nm depending on the amount loading (1 and 3 wt%). Although both of the FSP-derived Au-ZnO and Pt-ZnO possessed similar physical properties (i.e., crystallite size and specific surface area), an improvement in photocatalytic degradation of methylene blue in comparison to pure ZnO and commercial titania photocatalysts (JRC-TiO2 and P-25) was observed only for the Au-ZnO and not for the Pt-ZnO due probably to the different type of Fermi-level equilibration between Au and Pt. (C) 2009 Elsevier B.V. All rights reserved.