采用不同碳源制备碳掺杂TiO_2可见光催化剂

Visible Light carbon doped TiO_2 catalyst prepared with different dopants

分别采用不同的碳源制备得到碳掺杂TiO2,并采用X射线衍射、扫描电镜、紫外-可见吸收光谱和BET液氮吸附对碳掺杂TiO2的物相、粒径、吸收波长阀值和比表面积进行了表征。以苯酚溶液为催化降解对象,测定了不同碳源掺杂TiO2的可见光催化活性。结果表明:相对于以蔗糖为碳源制备碳掺杂TiO2,使用酚醛树脂能有效的阻止TiO2纳米材料在煅烧过程中的团聚,其制备得到的C-TiO2粒径小,比表面积大,吸收光波长红移较为明显,并在可见光存在条件下,3h能降解超过90%的苯酚,高于商品化的催化剂P25。

Carbon doped TiO2 powders were prepared by calcination using different types of carbon dopants as carbon source. The resulting photocatalyst was characterized by X-ray diffraction（XRD）, scanning electron microscopy（SEM）, UV-visible absorption spectroscopy （UV-Vis）and BET nitrogen adsorption. Photocatalysis of the catalyst was evaluated by photodegradation of phenol under visible light. Comparing to the carbon-doped TiO2 prepared with sucrose as carbion source,the catalyst can effectively prevent TiO2 nanoparticles agglomerated in calcination process using phenolic resin,and with small particle size,large specific surface area, the obviously absorption wavelength red shift. Over 90 % of phenol can be degradated after 3h under visible light irradiation,which was more effective than commercial P25.