影像科学与光化学 ›› 2007, Vol. 25 ›› Issue (4): 284-295.DOI: 10.7517/j.issn.1674-0475.2007.04.284

• 研究简报 • 上一篇    下一篇

TiO2/斜发沸石光催化降解罗丹明B的研究

李静谊, 刘丽娜, 斯琴高娃, 白图雅   

  1. 内蒙古大学, 化学化工学院, 内蒙古, 呼和浩特, 010021
  • 收稿日期:2006-11-07 修回日期:2006-12-18 出版日期:2007-07-23 发布日期:2007-07-23
  • 通讯作者: 李静谊(1972-), 女, 博士, 副教授, 主要从事光催化研究, 通讯联系人, E-mail:.
  • 基金资助:
    国家自然科学基金资助项目(20567002).

Study of the Photocatalytic Degradation of Rhodamine B on TiO2/Clinoptilolite

LI Jing-yi, LIU Li-na, SIQIN Gao-wa, BAI Tu-ya   

  1. College of Chemistry and Chemical Engineering, Inner Mongolia University, Hohhot 010021, Inner Mongolia, P.R.China
  • Received:2006-11-07 Revised:2006-12-18 Online:2007-07-23 Published:2007-07-23

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.

关键词: TiO2/斜发沸石, 罗丹明B(RhB), 紫外光照, 光催化, 降解

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.

Key words: TiO2/clinoptilolite, RhB, UV light irradiation, photocatalytic, degradation

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