Ti^(4+)掺杂制备花状SnO_(2)/Sn_(3)O_(4)异质结微米球及其光催化性能  

Flower⁃like SnO_(2)/Sn_(3)O_(4) Microspheres with Heterojunction:Fabrication by Ti^(4+)⁃Doping and Photocatalytic Performance

作　　者：张梦凡 李方 张振民 周晚琴 刘珍 余长林 ZHANG Meng-Fan;LI Fang;ZHANG Zhen-Min;ZHOU Wan-Qing;LIU Zhen;YU Chang-Lin(School of Chemical Engineering,Guangdong University of Petrochemical Technology,Maoming,Guangdong 525000,China;School of Chemistry and Chemical Engineering,Jiangxi University of Science and Technology,Ganzhou,Jiangxi 341000,China)

机构地区：[1]广东石油化工学院化学工程学院,茂名525000 [2]江西理工大学化学化工学院,赣州341000

出　　处：《无机化学学报》2021年第7期1227-1236,共10页Chinese Journal of Inorganic Chemistry

基　　金：广东省高等学校珠江学者特聘教授资助计划(2009);广东省基础与应用基础研究计划(No.2019A1515011249,2021A1515010305);广东省普通高等学校重点科研项目(自然)(No.2019KZDXM010);茂名市科技专项支持计划(No.2020KJZX035);广东石油化工学院创新团队支持计划资助。

摘　　要：通过水热法制备了由层状纳米片堆叠而成的花球状Sn_(3)O_(4)及x%Ti⁃SnO_(2)/Sn_(3)O_(4)(x%为Ti与Sn的物质的量之比)。采用X射线粉末衍射、扫描电子显微镜、透射电子显微镜、X射线光电子能谱、紫外-可见漫反射光谱、红外光谱和光电流响应等物理化学方法对合成的样品进行表征分析。结果表明,由于Ti^(4+)电负性及离子半径与Sn4+相似,可以很好地进入Sn_(3)O_(4)晶格中替代Sn4+形成替代掺杂,但不引起大的晶格畸变。同时,掺入Ti^(4+)后使得一部分Sn4+直接与O结合生成纳米球状SnO2颗粒分散覆盖在Sn_(3)O_(4)表面,形成SnO_(2)/Sn_(3)O_(4)异质结。光催化活性表明,x%Ti⁃SnO_(2)/Sn_(3)O_(4)不仅具有较强的还原Cr^(6+)能力,而且拥有氧化降解有机污染物甲基橙和酸性橙Ⅱ的能力。催化活性的增强归因于x%Ti⁃SnO_(2)/Sn_(3)O_(4)具有比较大的比表面积和更强的光吸收,同时SnO_(2)/Sn_(3)O_(4)异质结的生成有效地提升了光生电子与空穴的分离效率。The flower⁃like Sn_(3)O_(4) and x%Ti⁃SnO_(2)/Sn_(3)O_(4)(x%was the molar ratio of Ti to Sn)microspheres stacked by the layered nanosheets were prepared by the hydrothermal method.The synthesized samples were analyzed by physical and chemical methods,e.g.,X⁃ray powder diffraction,scanning electron microscopy,transmission electron microscopy,X⁃ray photoelectron spectroscopy,ultraviolet⁃visible diffuse reflectance spectroscopy,infrared spectroscopy,and photocurrent response.The results show that because ion radius of Ti^(4+)is similar to Sn4+,it can enter the Sn_(3)O_(4) lattice instead of Sn4+to form alternative dopants.At the same time,the doping of Ti^(4+)makes a part of Sn4+directly combine with oxygen to form nano⁃spherical SnO2 dispersed over the surface of Sn_(3)O_(4),forming a SnO_(2)/Sn_(3)O_(4) heterojunction.The photocatalytic activity test shows that x%Ti⁃SnO_(2)/Sn_(3)O_(4) not only has the ability to reduce Cr^(6+),but also has the ability to degrade methyl orange and acid orangeⅡ.The enhanced catalytic activity is attributed to the surface area and light absorption of x%Ti⁃SnO_(2)/Sn_(3)O_(4).Moreover,the produced SnO_(2)/Sn_(3)O_(4) heterojunction can effectively promote the separation efficiency of photo⁃generated electrons and holes.

关 键 词：Ti4+掺杂 SnO_(2)/Sn_(3)O_(4)异质结 还原Cr^(6+) 染料降解 

分 类 号：TQ426.6[化学工程]