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Journal of Environmental Biology

pISSN: 0254-8704 ; eISSN: 2394-0379 ; CODEN: JEBIDP

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    Abstract - Issue Sep 2012, 33 (5)                                     Back


nstantaneous and historical temperature effects on a-pinene

Application of Nano-TiO2 /LDPE composite film on photocatalytic

oxidation degradation of dichloromethane

 

Author Details

 

Kowit? Suwannahong

Department of Environmental Engineering, Faculty of Engineering , Kasetsart? University, Bangkok 10900, Thailand

Winai? Liengcharernsit

Department of Environmental Engineering, Faculty of Engineering , Kasetsart? University, Bangkok 10900, Thailand?????????

Wipada Sanongraj

(Corresponding author)??????

Department of Chemical Engineering, Faculty of Engineering, Ubon Ratchathani University,

Ubonratchathani 34190, Thailand

e-mail: wipadadechapanya@yahoo.com ?

Jittiporn? Kruenate

National Metal and Materials Technology Center, 114 Thailand Science Park, Paholyothin Road,

Klong Luang, Patumthani 12120, Thailand

 

 

 

Publication Data

Paper received:

25 February 2011

 

Revised received:

27 September 2011

 

Accepted:

17 October 2011

 

Abstract

This study focused on the photocatalytic destruction of dichloromethane (DCM) in indoor air using the nano-TiO2 /LDPE composite film as an economical photocatalyst. The nano-TiO2 was dispersed in a polyethylene matrix to form composite film. The photocatalytic activity of the nano-TiO2/LDPE composite films was evaluated through the degradation of dichloromethane (DCM) under UV-C irradiance at specific wavelength of 254 nm. The percentage of nano-TiO2 contents varied from 0, 5, and 10% (wt cat./wt LDPE composite film). The results derived from the kinetic model revealed that the photocatalytic rates of 5 and 10 wt.% nano-TiO2/LDPE composite films follow the first order reaction while the rate of the film without TiO2 followed the zero order reaction. At low concentration of DCM, the rate of photocatalytic degradation of the DCM was slower than that at high DCM concentration. The 10 wt.% of TiO2 content of the nano-TiO2/LDPE composite film yielded the highest degradation efficiency of 78%, followed by the removal efficiency of 55% for the 5 wt.% of TiO2 content of the nano-TiO2/LDPE composite film. In contrast with the composite film containing nano-TiO2, the LDPE film without adding nano-TiO2 expressed the degradation efficiency of 28%.?

 

Key words

Titanium dioxide, Nano-TiO2/LDPE composite film, Dichloromethane, Photocatalytic degradation

 

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