title: Application of nano-TiO2/LDPE composite film on photocatalytic oxidation degradation of dichloromethane.
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%.
authors.affiliation: Department of Environmental Engineering, Faculty of Engineering, Kasetsart University, Bangkok 10900, Thailand.
authors.forename: Kowit
authors.initials: K
authors.lastname: Suwannahong
authors.forename: Winai
authors.initials: W
authors.lastname: Liengcharernsit
authors.forename: Wipada
authors.initials: W
authors.lastname: Sanongraj
authors.forename: Jittiporn
authors.initials: J
authors.lastname: Kruenate
mesh_terms: D000393:Air Pollutants / Q000737:chemistry*; D016902:Air Pollution, Indoor; D002384:Catalysis; D007700:Kinetics; D008752:Methylene Chloride / Q000737:chemistry*; D008956:Models, Chemical; D010084:Oxidation-Reduction; D020959:Polyethylene / Q000737:chemistry*; D014025:Titanium / Q000737:chemistry*; D014466:Ultraviolet Rays; D014961:X-Ray Diffraction
chemical_list: D000393:Air Pollutants; C009495:titanium dioxide; D008752:Methylene Chloride; D020959:Polyethylene; D014025:Titanium