中文摘要：

采用钛醇盐水解法与溶胶凝胶法,以氨水、尿素、三乙胺为氮源,制备了纳米TiO2-xNx光催化剂。为了在净化室内空气的同时能够装饰环境,提出了喷涂和浸泡2种工艺将光催化剂负载于室内装饰品,并在模拟太阳光的照射下对室内污染物甲醛进行降解。XRD、UV-Vis光谱及XPS分析结果表明,在烧结温度为400℃时得到的3种TiO2-xNx是锐钛矿相,其中以尿素为氮源的TiO2-xNx温度达到600℃时开始发生相转变,3种TiO2-xNx在可见光区域的400～550 nm均出现新的吸收;以氨水、尿素和三乙胺为氮源制备的TiO2-xNx的掺氮量分别为2.77%、0.29%和0.47%。以氨水为氮源制备的光催化剂,14 h降解甲醛的效率达到了95%;以三乙胺为氮源制备的光催化剂7 h降解甲醛的效率达到了96%。因此,应用喷涂法在室内装饰品上负载光催化剂降解室内污染物具有很好的应用前景。

英文摘要：

Nanocrystalline TiO2-xNx photocatalysts were prepared by hydrolysis of titanium alkoxide and sol-gel method using aqueous ammonia,urea and triethylamine as nitrogen sources,respectively.The photocatalytic activity of TiO2-xNx coated on the ornamental flowers by spray-coating and dipping methods was evaluated through a study of the decomposition of formaldehyde under simulated solar light.The obtained photocatalysts were characterized by X-ray diffraction,UV-Vis spectrum and X-ray photoelectron spectrum.The results show that three kinds of TiO2-xNx are mainly anatase phase after calcinations at 400 ℃.The TiO2-xNx prepared with urea was calcined under 600°C,the phase transformation was observed.Moreover,TiO2-xNx showed a new absorption from 400 to 550 nm in the visible light region.The XPS results show that the nitrogen content of TiO2-xNx using ammonia,urea and triethylamine as nitrogen sources was 2.77%,0.29% and 0.47%,respectively.The degradation rate of formaldehyde reached 96% and 95% for the photocatalysts prepared with triethylamine and ammonia as nitrogen source,respectively.Therefore,spray-coating process is a promising method for indoor pollution degradation.