华南理工大学学报(自然科学版) ›› 2010, Vol. 38 ›› Issue (8): 142-146.doi: 10.3969/j.issn.1000-565X.2010.08.027

• 环境科学与技术 • 上一篇    下一篇

纳米TiO2光催化降解甲醛的影响因素

沈文浩 陈小泉 李东勋 龙周   

  1. 华南理工大学 制浆造纸工程国家重点实验室, 广东 广州 510640
  • 收稿日期:2009-11-06 修回日期:2009-12-01 出版日期:2010-08-25 发布日期:2010-08-25
  • 通信作者: 陈小泉(1963-),男,博士,副教授,主要从事环境化工新技术等的研究.E-mail:xqchencn@scut.edu.cn E-mail:ppwhshen@seut.edu.cn
  • 作者简介:沈文浩(1967-),女,博士,副教授,主要从事环境化工的监测及控制研究.
  • 基金资助:

    广东省重大科技专项计划项目(2008A090300016);广东省教育部产学研结合专项资金资助项目(2007A090302069)

Factors Affecting Photocatalytic Degradation of Formaldehyde by Nano-Sized Titania

Shen Wen-hao  Long Zhou  Chen Xiao-quan  Li Dong-xun   

  1. State Key Laboratory of Pulp and Paper Engineering, South China University of Technology, Guangzhou 510640, Guangdong, China
  • Received:2009-11-06 Revised:2009-12-01 Online:2010-08-25 Published:2010-08-25
  • Contact: 陈小泉(1963-),男,博士,副教授,主要从事环境化工新技术等的研究.E-mail:xqchencn@scut.edu.cn E-mail:ppwhshen@seut.edu.cn
  • About author:沈文浩(1967-),女,博士,副教授,主要从事环境化工的监测及控制研究.
  • Supported by:

    广东省重大科技专项计划项目(2008A090300016);广东省教育部产学研结合专项资金资助项目(2007A090302069)

摘要: 为了研究自制的纳米TiO2对环境空气中有机污染物的光催化降解能力,文中通过自制光催化反应系统,研究了纳米TiO2光催化降解甲醛的过程,考察了环境相对湿度、光照强度、气体流量、甲醛初始质量浓度等因素对甲醛的气相光催化降解反应的影响.结果表明:纳米TiO2光催化降解甲醛的最佳相对湿度为50%,适宜气体流量为1.20L/min;光降解率并不会随光照强度的增加无限制地增大,甲醛初始质量浓度的增加将降低光催化氧化降解速率.

关键词: 纳米二氧化钛, 光催化氧化, 甲醛, 空气

Abstract:

In order to evaluate the photocatalytic degradation capacity of self-prepared nano-sized TiO2 for the organic pollutants in the air, a self-developed photocatalytic degradation reaction system was adopted to analyze the photocatalytic degradation process of formaldehyde and to investigate the factors influencing the degradation, such as the relative humidity, the illumination intensity, the gas flowrate and the initial mass concentration of formaldehyde. The results indicate that the photocatalytic degradation performs best at a relative humidity of 50% and a gas flowrate of 1.20 L/min; and that the photocatalytie degradation rate does not increase unlimitedly with the increase in illumination intensity, but it decreases with the increase in the initial mass concentration of formaldehyde.

Key words: nano-sized titania, photocatalytic oxidization, formaldehyde, air