Journal of South China University of Technology (Natural Science Edition) ›› 2011, Vol. 39 ›› Issue (1): 68-73.doi: 10.3969/j.issn.1000-565X.2011.01.013

• Electronics, Communication & Automation Technology • Previous Articles     Next Articles

Photocatalytic Degradation of Formaldehyde Driven by Discharge Plasma

Chen Li Ou Rui-kun Yan Zong-cheng Wang Hong-lin Ma Zhen   

  1. South China university of technology and engineering college chemistry, guangdong guangzhou 510640
  • Received:2010-01-26 Revised:2010-06-03 Online:2011-01-25 Published:2010-12-01
  • Contact: 陈砺(1958一)，男，教授，博士生导师，主要从事等离子体化学及生物质能研究 E-mail:celichen@scut．edu．cn
  • About author:陈砺(1958一)，男，教授，博士生导师，主要从事等离子体化学及生物质能研究
  • Supported by:

    广东省科技计划项目(2008B030302030)；广东省教育部产学研结合项目(2007B090400069)

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Abstract:

The degradation of formaldehyde via TiO2 photocatalysis coupled with dielectric barrier discharge was investigated, which aimed to reveal the effects of discharge voltage, catalyst support, calcination temperature and transition metal ion-doping on the degradation efficiency of formaldehyde. The results indicated that (1) TiO2/γ-Al2O3 photocatalyst improved the degradation efficiency of formaldehyde and the products selectivity significantly; (2) the degradation rate increased with increasing discharge voltage or decreasing calcination temperature; when the discharge voltage was 20.7kV and the calcination temperature was 400℃, respectively, the degradation rate reached 83.8%; (3) plasma-driven anatase TiO2 system showed the best degradation efficiency compared to the plasma-driven rutile TiO2 system and the plasma-driven mixed crystal system; (4) after Mn ion-doping, the degradation rate increased 45.7% compared to the system with plasma alone, while the ratio of CO/CO2 and O3 concentration decreased about 42.5% and 39.4%.

Key words: dielectric barrier discharge, plasma, photocatalysis, formaldehyde, Mn ion-doping