Beijing University of Technology

About: Beijing University of Technology is a education organization based out in Beijing, Beijing, China. It is known for research contribution in the topics: Microstructure & Computer science. The organization has 31929 authors who have published 31987 publications receiving 352112 citations. The organization is also known as: Běijīng Gōngyè Dàxué & Beijing Polytechnic University.

Photo-oxidation properties of nitrogen doped SrTiO3 made by mechanical activation

Abstract: Nitrogen doped SrTiO 3 powders were prepared by mechanochemical reaction of SrTiO 3 and 20 wt.% of three kinds of doping sources, hexamethylenetetramine, urea and ammonium carbonate using a high energy planetary ball mill. The effects of several factors such as the kinds of nitrogen doping source, milling time, content of nitrogen source in the raw material, post-grinding heat treatment temperature and post-grinding heat treatment atmosphere on the photocatalysis of the samples have been studied. The nitrogen doped SrTiO 3 had yellow color and possessed two absorption edges around 390 and 470 nm. The sample prepared by grinding the mixture of 20 wt.% hexamethylenetetramine-80 wt.% SrTiO 3 followed by heat treatment at 400 °C in air showed the best performance in the elimination of NO. The value of NO destruction under visible light ( λ >400 nm) irradiation attained to 47.8%, which was about 3.5 and 1.4 times higher than that of pure SrTiO 3 and commercial titania (Degussa P-25).