摘要
采用3种制备方法对纳米TiO2催化剂进行疏水改性,以高浓度硝基苯为处理对象,在可见光照射下,研究了催化剂的疏水改性方法及其影响因素,并进行了光催化反应影响因素研究.结果表明,滴加法和吸附法制备的催化剂具备完整的TiO2(锐钛矿)和CuO晶体衍射峰,共沉法制备的催化剂没有TiO2(锐钛矿)衍射峰出现;不同方法制备的催化剂对可见光吸收阈均达到900 nm;滴加法和吸附法制备的催化剂疏水位主要是长链烷基;共沉法制备的催化剂疏水位主要是短链烷基.降解试验发现具备长链烷基的催化剂有较佳的催化能力,滴加法氮气煅烧得到的催化剂催化性能最好,2 h硝基苯去除率可达75%.
Three preparation methods were used to modify a nano-TiO2 catalyst to have hydrophobic properties.The hydrophobicity modification methods and influencing factors,as well as influencing factors of the catalytic reaction,were researched in visible light irradiation using high-concentration nitrobenzene as the object. The results showed： the catalysts prepared using the dropping and absorbing methods had complete crystal diffraction peaks of anatase TiO2 and CuO,while catalysts prepared using the co-precipitate method did not have anatase TiO2;the absorption edges of catalysts by different methods reached 900 nm;and,the hydrophobic regions of dropping and absorbing catalysts were mostly long-chain alkyls,while those of co-precipitate catalysts were mostly short-chain alkyls.Degradation experiments showed that catalysts with long-chain alkyls had better catalytic ability,and the best catalysts were prepared by dropping method calcined under N2,which degraded 75% of nitrobenzene within 2 h.
出处
《环境科学研究》
EI
CAS
CSCD
北大核心
2009年第9期1044-1048,共5页
Research of Environmental Sciences
基金
教育部博士点基金项目(20070611009)
教育部科技创新工程重大项目培育项目(708071)
