可见光下氮掺杂二氧化钛对巯基苯并噻唑的降解

光降解反应中为了有效地利用可见光,以氨水为氮源,采用溶胶凝胶法在温和条件下制备出黄色氮掺杂二氧化钛。分别采用XRD、TEM、XPS和UV-Vis漫反射光谱对样品进行了表征。结果表明,所制备的样品均为锐钛矿相,晶粒随N/Ti配比的增加而增大;氮掺杂进入二氧化钛晶格中使可见光吸收增强。为控制水处理过程中的气味问题,以巯基苯并噻唑为探针,考察了氮掺杂二氧化钛的可见光活性。结果显示氮掺杂二氧化钛在可见光照射下可使巯基苯并噻唑的降解率为商用二氧化钛DegussaP-25的3倍。此外,存在一个最佳N/Ti配比显示出最高的可见光活性。

The Photodegradation of 2-mercaptobenzothiazole in the suspension of nitrogen-doped titania under visible light

In order to utilize visible light in photocatalytic reaction,yellow nitrogen-doped titania were prepared by sol-gel method in mild condition,with the elemental nitrogen source from aqua ammonia.The catalysts were characterized by XRD,TEM,XPS,and UV-Vis diffuse reflectance spectrophotometer.The analytical results demonstrated that all catalysts were anatase,and the crystallite size of nitrogen-doped titania increased with increasing of N/Ti proportioning,and the doping of nitrogen could extend the absorption shoulder into the visible light region.With a purpose of odor control,2-mercaptobenzothiazole(MBT)was used in this study as a model chemical,and photocatalytic activities of the nitrogen-doped titania were investigated based on the MBT photodegradation in aqueous solution under visible light.The experimental results showed that the photocatalytic activity of nitrogen-doped titania were nearly 3 times higher than that of the commercial titania photocatalyst Degussa P-25 for MBT degradation under visible light irradia-tion.In addition,there was an optimum N/Ti proportioning to exhibit the highest visible-light activity.