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Fabrication and study on structure, photocatalysis of TiO2:N Al2O3 material for CO, NO degradation

An Al2O3 overcoated TiO2:N layer was synthesized using the solgel method. XRD, SEM and UV-vis measurements were used to study the structure and optical properties of the material. The XRD results indicated that the TiO2:N layer was identified only as an anatase phase. | JOURNAL OF SCIENCE OF HNUE Mathematical and Physical Sci. 2013 Vol. 58 No. 7 pp. 94-99 This paper is available online at http stdb.hnue.edu.vn FABRICATION AND STUDY ON STRUCTURE PHOTOCATALYSIS OF TiO2 N Al2 O3 MATERIAL FOR CO NO DEGRADATION Ma Thi Anh Thu1 Nguyen Manh Nghia2 and Nguyen Thi Hue3 1 Faculty of Natural Sciences Cao Bang Teacher Training College 2 Faculty of Physics Hanoi National University of Education 3 Institute of Environmental Technology Vietnam Academy of Science and Technology Abstract. An Al2 O3 overcoated TiO2 N layer was synthesized using the solgel method. XRD SEM and UV-vis measurements were used to study the structure and optical properties of the material. The XRD results indicated that the TiO2 N layer was identified only as an anatase phase. SEM images showed that the diameter of particles was around 15-30 nm depending on the NH C2 H4 OH 2 concentration in the sol solution. UV-vis spectrums suggested that a TiO2 N Al2 O3 sample can absorb visible light. These results indicate that fabricated material degrades CO NO better than Degussa P25 commercial TiO2 when exposed to natural light. Keywords TiO2 Al2 O3 photocatalysis. 1. Introduction Titanium dioxide is a catalytic material that is used to treat contaminants at room temperature and normal atmospheric pressure 1 5-7 . This material is a typical photocatalyst which is capable of degrading contaminants with the aid of sunlight or artificial illumination without requiring special conditions such as high temperature or high pressure 2 3 . However the large bandgap of about 3.2 eV of pure TiO2 in the anatase phase causes the photocatalytic property of TiO2 to be limited in the ultraviolet radiation range. This is a major limitation because no more than 5 of solar radiation can be used to stimulate photocatalysis of TiO2 . Therefore improving the efficiency of TiO2 photocatalysis by expanding its absorption region to the visible radiation range has potential and is therefore attracting the