Preparation method of visible-light-responsive ashing nano-TiO2 photocatalyst

Abstract

The invention provides a preparation method of a visible-light-responsive ashing nano-TiO2 photocatalyst. The method includes the following steps that firstly, nano-TiO2 p25 powder and reduction iron powder in the molar ratio of 1:1 are weighed and put into a reactor with circulating cooling water, and at the room temperature, an ultrasonic reaction is carried out for 1 h at the power of 570 W through an ultrasonic cell crusher, wherein 100 ml of deionized water is contained in the reactor; secondly, after a reaction product is obtained, a strong magnet is attracted to the bottom of the reactor, and reaction liquid is poured out so as to remove excessive iron powder; thirdly, the reaction product is repeatedly washed 3-5 times with diluted hydrochloric acid and then washed with deionized water till magnetism disappears, which shows that iron is removed; fourthly, after filtering, vacuum drying is carried out for 8 h at 60 DEG C, and modified nano-TiO2 is obtained. The method has the advantages that the photoactivity of the modified nano-TiO2 photocatalyst only depends on the catalyst TiO2, ingredients are simple, controllability and stability are good, original ultraviolet light absorbability and strong oxidizability are kept, and the nano-TiO2 photocatalyst is responsive to visible light under the premise that the energy band position is not changed.

Description

technical field [0001] The invention belongs to the technical field of synthesis of photocatalytic products, in particular to an ashed nano-TiO that can respond to visible light 2 Preparation method of photocatalyst. Background technique [0002] Solar energy has the advantages of being cheap, clean, and renewable. Semiconductor photocatalysis technology, which focuses on efficient utilization and conversion of solar energy, and mainly uses photolysis of water to produce hydrogen and photocatalysis to eliminate environmental pollutants, is the two major tasks of human beings to deal with the environment and energy in the 21st century. important means of challenge. The key to the application of this technology is to obtain photocatalysts with high solar energy utilization efficiency and catalytic activity. [0003] At present, there are many photocatalysts with excellent performance, such as TiO 2 , BiOCl and La, Nb, Ta-based oxides, etc. Most of them are wide-bandgap sem...

AI Technical Summary

Problems solved by technology

The catalysts prepared in the literature rely on iron to enhance photoactivity, so there is uncontrollability. Iron is a variable valence state that is prone to change and has poor stability. Once titanium dioxide is separated from the composite matrix iron, the catalyst efficiency will decrease or even become inactive.

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