Ni掺杂介孔TiO_2的制备及其光催化降解造纸废水  

Preparation of Ni Doped Mesoporous TiO_2 and Its Application in Photocatalytic Degradation of Papermaking Wastewater

作　　者：徐会颖[1] 周国伟[1] 魏英勤[1] 乔文婷[1] 

机构地区：[1]山东轻工业学院,山东济南250353

出　　处：《中国造纸》2008年第3期28-31,共4页China Pulp & Paper

基　　金：山东省自然科学基金重点项目(No.Z2006B07);教育部留学归国人员科研启动基金项目(No.2005383)

摘　　要：采用溶胶-凝胶法合成了不同Ni掺杂量的介孔TiO2材料,用X射线衍射(XRD)、透射电子显微镜(TEM)、红外(FT-IR)和N2吸附脱附等分析技术对产物结构和组成进行了表征。结果表明,介孔骨架TiO2主要以锐钛矿存在,介孔孔径由未掺杂时的8.8nm增加到掺杂2%后的10.6nm,BET比表面积由未掺杂时的159m2/g降至136m2/g。在紫外光照射、初始pH值4、连续通氧、催化剂用量1.5g/L的反应条件下,使用不同Ni掺杂量的TiO2作为催化剂光催化降解造纸废水。实验表明,当Ni掺杂量为2%时,造纸废水的光催化降解效果最佳。以Ni掺杂量为2%的TiO2为催化剂,光催化降解造纸废水,废水的色度和CODCr去除率分别为100%和83.4%。Different Ni doped mesoporous TiO2 were prepared by using sol-gel method. The resultant materials were characterized by XRD, TEM, FT-IR and nitrogen adsorption-desorption. The results indicated that mesoporous matrix TiO2 exists in anatise, the pore diameter increases from original 8.8 nm to 10.6 nm when 2% Ni is doped, while the specific surface area decreases from 159 m^2/g to 136 m^2/g. Photocatalytic degradation of papermaking wastewater under ultraviolet radiation was carried out trader the conditions of initial pH=4, bubbling with oxygen and catalyst dosage being 1.5g/L. The results showed that the optimum level of nickel doping in mesoporous TiO2 is 2%. The chroma and CODCr removal rates for the wastewater are up to 100% and 83.4% respectively after 12 h irradiation with 2% Ni/TiO2 as catalyst.

关 键 词：介孔TIO2 Ni掺杂 光催化降解 造纸废水 

分 类 号：X793[环境科学与工程—环境工程]