Network Structured SnO2/ZnO Heterojunction Nanocatalyst with High Photocatalytic Activity
Network Structured SnO2/ZnO Heterojunction Nanocatalyst with High Photocatalytic Activity
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具有高光催化活性的网络结构SnO2/ZnO异质结纳米催化剂
DOI：
10.1021/ic802293p
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发表时间：
2009-03-02
影响因子：
4.6
通讯作者：
Zhu, Jiefang
中科院分区：
文献类型：
--
作者：
Zheng, Lirong;Zheng, Yuanhui;Zhu, Jiefang
采用简单的两步溶剂热法成功制备了具有高光催化活性的网络结构SnO 2/ZnO异质结纳米催化剂。采用X射线衍射、X射线光电子能谱、透射电子显微镜、扫描电子显微镜、N-2物理吸附和紫外-可见光谱对合成样品进行了表征。结果表明，Sn/Zn摩尔比为1的SnO 2/ZnO样品是由SnO 2和ZnO组成的介孔复合材料。SnO 2/ZnO异质结纳米催化剂对橙子的光催化降解活性远高于溶剂热合成的SnO 2和ZnO样品，这可以归因于SnO 2-ZnO异质结、样品的孔结构和较高的Brunauer-Emmeff-Teller（BET）表面积：（1）由于SnO 2和ZnO之间的势能差，SnO 2-ZnO异质结改善了光生电子-空穴对的分离，从而提高了光催化活性。(2)由于SnO 2/ZnO样品具有较高的比表面积和较多的孔道结构，可能具有更多的表面反应位点，吸附和传输更多的染料分子，从而具有更高的光催化活性。
A network-structured SnO2/ZnO heterojunction nanocatalyst with high photocatalytic activity was successfully synthesized through a simple two-step solvothermal method. The as-synthesized samples are characterized by X-ray diffraction, X-ray photoelectron spectroscopy, transmission electron microscopy, scanning electron microscopy, N-2 physical adsorption, and UV-vis spectroscopy. The results show that the SnO2/ZnO sample with a molar ratio of Sn/Zn = 1 is a mesoporous composite material composed of SnO2 and ZnO. The photocatalytic activity of SnO2/ZnO heterojunction nanocatalysts for the degradation of methyl orange is much higher than those of solvothermally synthesized SnO2 and ZnO samples, which can be attributed to the SnO2-ZnO heterojunction, the pore structure, and higher Brunauer-Emmeff-Teller (BET) surface area of the sample: (1) The SnO2-ZnO heterojunction improves the separation of photogenerated electron-hole pairs due to the potential energy differences between SnO2 and ZnO, thus enhancing the photocatalytic activity. (2) The SnO2/ZnO sample might possess more surface reaction sites and adsorb and transport more dye molecules due to the higher BET surface area and many pore channels, also leading to higher photocatalytic activity.