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OALib Journal期刊
ISSN: 2333-9721
费用：99美元
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S掺杂S-TiO2/SiO2可见光响应光催化剂的制备及性能
DOI: 10.3724/SP.J.1088.2012.11127, PP. 993-999
Keywords: 二氧化钛,二氧化硅,硫掺杂,可见光,光催化
Abstract:
？以四氯化钛为钛源,硫脲为硫源,采用液相水解-沉淀法制备了S掺杂的TiO2/SiO2(S-TiO2/SiO2)催化剂,并以苯酚为模型物,考察了催化剂在可见光区、紫外光区和太阳光下的光催化活性,以及催化剂的使用寿命和分离性能.采用X射线光电子能谱、傅里叶变换红外光谱、紫外-可见漫反射光谱、X射线衍射、透射电镜及N2吸附-脱附等技术对催化剂进行了表征.结果表明,S以+6价形式进入TiO2体相并置换晶格中的Ti4+,适量S掺杂的S-TiO2/SiO2在紫外光区、可见光区和太阳光下均表现出较高的光催化活性.SiO2与TiO2界面间有Ti–O–Si键形成,结合牢固.S掺杂在TiO2表面生成Ti–O–S键,形成新的能级结构,使光催化剂在450~550nm产生吸收,诱发TiO2可见光催化活性;同时提高了TiO2表面羟基数量.SiO2的加入可减小TiO2颗粒的平均尺寸,增大催化剂的比表面积,改善催化剂的分离性能,提高催化剂的使用寿命.
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