摘要
采用共沉淀方法制备了Si共掺杂的SiO2/TiO2光催化复合粉末,将其负载于活性炭(ACF)上。在流动化床中,考察了煅烧温度、煅烧时间、Si掺杂量、负载次数、光照条件以及甲醛初始浓度对该复合剂光催化降解甲醛效率的影响。结果发现当Si:Ti=1:4、SiO2/TiO2复合催化剂煅烧时间4h、煅烧温度400℃,ACF上负载1次,18W紫外光照射时,甲醛的降解效果最佳,对初始浓度小于0.4mg/L的甲醛气体,降解率可达90%左右。
SiO2/TiO2 composite catalyst was prepared by co -precipitation method, and loaded on activated carbon fiber （ACF）. Using this nanometer composite catalyst and in a continuous -flow reactor, the effects of amount SiO2 - doped, calcinate time and temperature, coating cycles, light condition and initial concentration of formaldehyde on photocatalytic degradation were investigated. The result showed that the performance of SiO2/TiO2 composite catalyst was best, when Si ： Ti = 1 ： 4 （ mole ratio） and calcined at 400 ℃ for 4 h, coating one film, UV irradiation with power 18 W, and the degradation percentage of formaldehyde was about 90 when the initial concentration of formaldehyde was less than O. 4 mg/L.
出处
《广州化工》
CAS
2011年第2期53-56,共4页
GuangZhou Chemical Industry
基金
集美大学预研基金资助项目(C60618)
关键词
TIO2
光催化
甲醛
TiO2
photocatalysis
formaldehyde.
