Authors: Nguyen Thi Hue; Dinh Thi Thuy Hang
Addresses: Institute of Environmental Technology, Vietnam Academy of Science and Technology, 18 Hoang Quoc Viet Street, Cau Giay District, Hanoi, Vietnam ' Environmental Engineering Division, Vietnam Maritime University, 484 Lach Tray Street, Ngo Quyen District, Hai Phong, Vietnam
Abstract: Anatase-TiO2 has been successfully coated on the surface of quartz cotton (SiO2) and alumina fibre (Al2O3) by the sol-gel method. The thickness of single layer of TiO2/SiO2 is 1 µm, while that of TiO2/Al2O3 is 300 nm. The TiO2 crystals are fine with the diameter varied from 20 to 25 nm. The TiO2 crystalline structure is defined by XRD method, and the thickness of the coatings by either XRD or SEM one. Benzene with the concentration of 0.44mg/m³ can be totally decomposed by TiO2/SiO2 and in about 85% by TiO2/Al2O3 after 8 hours; by increasing UV light (to 40W), the benzene can be completely decomposed after 4.5 hours by TiO2/SiO2 and after 6 hours by TiO2/Al2O3. Thus, TiO2/SiO2 and TiO2/Al2O3 are good materials for fabricating filters to treat hazardous substances in air environment.
Keywords: photocatalysts; nano-TiO2; titanium dioxide; SiO2; silicon dioxide; silica; Al2O3 fibre; aluminium oxide; alumina; sol-gel method; spraying method; benzene; photocatalytic decomposition; quartz cotton; UV light; ultraviolet; nanotechnology; filters; hazardous substances; air pollution; air quality.
International Journal of Nanotechnology, 2013 Vol.10 No.3/4, pp.214 - 221
Published online: 05 Apr 2013 *Full-text access for editors Access for subscribers Purchase this article Comment on this article