【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.更多还原

【Abstract】 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.更多还原