Visible photoactivating photo catalyst and light-column type packed bed reaction unit

Abstract

The invention relates to a nitrogen-doped visible photosensitized TiO2 photocatalyst making method as well as its light-array type filling-fixed-bed photocatalysis fluid processing method and device. It evenly produces water and ammonia at the same time in the system by ammonium bicarbonate thermolysis, to make titanium tetrachloride carry out even hydrolysis and ammonolysis reactions to produce nitrogen-doped metatitanic acid fore body, which is treated at the nitrogen atmosphere under low temperature to obtain visible photosensitized nitrogen-doped nano TiO2 film or powder. The glass-tube ultraviolet light cannulas are uniformly distributed in the light-array type reactor, where the load-type photocatalyst is filled in the huddling mode in the air gap between the cannulas. It has advantages of moderate reacting condition, low heat treating temperature, etc. The photocatalysis reactor has advantages of continuous running, convenient operation, high efficiency, etc; can be applied to sewage treatment, drinking water's deep purification, waste gas treatment, etc.

Description

technical field [0001] The invention relates to a visible light sensitized photocatalyst preparation method for photocatalytic water treatment and air purification and a column lamp type filled fixed bed photocatalytic reaction device. Background technique [0002] Photocatalytic water treatment and air purification technology is a very promising environmental pollution control technology, and has some practical applications. At present, the photocatalyst that has been extensively studied and considered to have the most application value is TiO 2 . Under the excitation of light, TiO 2 The valence band electrons of the photocatalyst are excited to its conduction band, photogenerated holes and electrons are generated in the valence band and conduction band respectively, and these photogenerated carriers migrate to TiO 2 The surface of the particles is captured by surface species (such as -OH, adsorbed water and oxygen, etc.), generating reactive oxy...

AI Technical Summary

Problems solved by technology

[0005] Japanese patent JP 2002166176A2 loads the photocatalyst on a carrier such as glass beads with a particle size of 0.3-5 mm, and then constructs a concentric annular packed bed reactor with an ultraviolet lamp placed in the center of the inner tube. The allowable annular gap width of this reactor is Very narrow, it is difficult to give a solution for enlarged applications

Japanese patent JP 2001239257A2 coats the photocatalyst on the inner wall of the glass tube, and then forms these glass tubes into a tubular reactor, and the fluid to be treated (exhaust gas or waste water) flows through the tube. The disadvantage of this type of reactor is the specific surface area of ​​the photocatalyst Very low, the contact effect between the fluid and the catalyst surface (i.e. mass transfer) is poor, and there are also problems with the uniform irradiation of the light source

Images