摘要
以钛酸四丁酯[CH3(CH2)3O]4Ti]为钛源,硝酸铁[Fe(NO3)3-9H2O]为改性剂,采用溶胶-凝胶法合成了掺铁纳米TiO2催化剂.纳米TiO2的最佳掺铁量为0.05%,最佳煅烧温度为500℃.采用X射线衍射、热重-差热、紫外-可见光谱对其结构进行了表征.结果表明,500℃时煅烧的掺铁0.05%的TiO2为锐钛矿型,晶粒粒径为17.5nm,其光谱吸收边带发生了红移,吸收强度增大.对50mg/L氧化乐果溶液的光催化降解实验表明,当光催化剂的最佳用量为0.2g/L、溶液pH为8.6时,250W高压汞灯照射2.5h,乐果的降解率达到了85.23%,降解反应符合一级动力学方程.
Titanium dioxide sol was synthesized by sol-gel method with adulteration of Fe（NO3）3.9H2O. The samples were characterized by XRD, DTA-TG and UV-Vis. The results show that the diameter of particles is 17.5 nm and pure anatase. From the UV-Vis spectra the absorption edge of iron-doped titania has a red shift and the absorption intensities are increased. The degradation rate of omethoate reaches 85.23% when the dosage of photocatalyst is optimally 0.2 g/L, pH=8.6 and 2.5 h illumination with high-voltage mercury lamp. The photocatalytic degradation kinetics follows the pseudo-first order reaction.
出处
《过程工程学报》
CAS
CSCD
北大核心
2009年第6期1115-1120,共6页
The Chinese Journal of Process Engineering
基金
重庆市自然科学基金重点资助项目(编号:CSTC
2008BA4012)
重庆市科技攻关基金资助项目(编号:CSTC
2009AC4066)
关键词
光催化
二氧化钛
铁掺杂
乐果
photocatalysis
TiO2
iron doped
omethoate
