Preparation method of low-temperature non-aqueous sol-gel of high-activity carbon-chlorine codoped titanium dioxide visible light catalyst

Abstract

The invention provides a preparation method of low-temperature non-aqueous sol-gel of a high-activity carbon-chlorine codoped titanium dioxide visible light catalyst, and titanium dioxide is in anatase or rutile structure. The method comprises the following steps of: adding titanium salts into an organic solvent of alcohols and carbon-chlorine compounds; carrying out heat treatment on the whole mixture with low-temperature non-aqueous sol-gel, and then, carrying out suction filtration to obtain solid products; washing and drying the solid products; and changing the volume ratio of the alcohols to the carbon-chlorine compounds in the reaction system to obtain corresponding carbon-chlorine codoped titanium dioxide of different crystal forms. The anatase and rutile carbon-chlorine codoped titanium dioxide obtained in the reaction has good catalytic activity under visible light and can nearly completely degrade pollutants in about 2 hours under the irradiation of visible light. The methodhas the advantages of simple synthetic route, easy control of the whole technical process, low reaction temperature, easy acquisition of raw materials and low cost, enables the yield to reach 93%, and is suitable for industrial mass production.

Description

technical field [0001] The invention relates to a low-temperature non-aqueous sol-gel method for synthesizing a carbon-chloride co-doped anatase or rutile titanium dioxide visible light catalyst. Under irradiation, nearly 100% degradation of pollutants can be achieved within 2 hours. Background technique [0002] Photocatalysis is a research field that has gradually emerged since the 1970s. In 1972, two professors Fujishima and Honda of the University of Tokyo discovered rutile TiO 2 The single crystal electrode generates electromotive force under the irradiation of xenon lamp, and electrolyzes water to generate hydrogen, indicating that TiO 2 Capable of converting light energy into chemical energy stored in hydrogen [Fujishima, A.; Honda, K., Electrochemical photocatalysis of water at a semiconductor electrode. Nature 1972, 238, 37]. This discovery immediately set off an upsurge in semiconductor photocatalysis research, TiO 2 As a new type of photocatalytic material, it...

AI Technical Summary

Problems solved by technology

In previous work, the applicant reported the use of a low-temperature controllable one-pot method to prepare a high-efficiency carbon-chlorine co-doped anatase titanium dioxide photocatalyst with adjustable doping ratio and large specific surface area. doped anatase titanium dioxide photocatalyst, but in this work, the control of doping element content has a lot to do with the content of trace water added in the reaction system, so very precise quantification is required in the reaction process[Xu , H.; Zhang, L Z., J.Phys.Chem.C.2010, 114, 940]

Images