摘要
制备了一系列TiO2/斜发沸石催化剂(不同焙烧温度、不同粒度和不同负载量),它们在紫外光照射下可降解有机染料罗丹明B(RhB).发现焙烧温度为500℃、粒度为180—200目、TiO2实际质量分数为6.18%的催化剂样品活性较好.将其与P25对比,发现其降解速率虽低于P25(紫外光照84 min,P25COD变化率为100%,而焙烧温度为500℃的TiO2/斜发沸石催化剂经紫外光照5.5 h,COD变化率为71.8%),但是TiO2/沸石催化剂易于回收再利用,而纯P25因为颗粒细小,沉降速率慢,而不能快速分离.用XRD、TEM、BET、TG-DTA和紫外可见漫反射等方法表征了这些催化剂,结果表明催化剂比表面积增大有利于催化活性的提高.
A series of TiO2/clinoptilolite catalysts（different calcination temperature, different particle size and different loading） were prepared. The catalysts can degrade organic dye RhB under UV irradiation. The results show that they have a better catalytic reactivity when the calcination temperature is 500 ℃, the particle size is 180--200 mesh and the authentic mass fraction is 6.18 %. It was compared with P25. The results show that its degradation rate is slower than P25 ： After UV light irradiation of 84 minutes, COD change of P25 is 100 %. But after UV light irradiation of 5.5 h, COD change of TiO2/clinoptilolite calcinated at 500 ℃ is 71.8%. But TiO2/clinoptilolite catalysts are easier to reuse. Because the particle size of P25 is smaller, its sediment rate is slower and it can＇ t fastly be separated. XRD, TEM, BET, TG-DTA, UV, and Visible diffuse reflectance spectra were employed to characterize these catalysts. The experimental results show that they will have a better photocatalytic reactivity when their BET surface area is bigger.
出处
《感光科学与光化学》
EI
CAS
CSCD
2007年第4期284-295,共12页
Photographic Science and Photochemistry
基金
国家自然科学基金资助项目(20567002)
