Preparation method of copper and cerium composite silver halide/silver photocatalyst and flue gas demercuration method adopting photocatalyst

Abstract

The invention provides a preparation method of a copper and cerium composite silver halide / silver photocatalyst. The preparation method of the copper and cerium composite silver halide / silver photocatalyst comprises the following steps of mixing a ready Ce(NO3)3 solution with a Cu(NO3)2 solution, and then adding citric acid into an obtained first mixture, and heating insolating, grinding and sieving an obtained second mixture in sequence to obtain solid powder CuyCe1-yOz; adding the solid powder CuyCe1-yOz into an AgNO3 solution to obtain a solution A, and then adding a Na2CO3 solution into the solution A; afterwards, adding 0.1 mol of potassium chloride (KCl), potassium bromide (KBr) or potassium iodide (KI) into an obtained third mixture to obtain a solution B; culturing the solution B through a heating device, and then adding ethanediol into the cultured solution B to obtain a solution C; washing, drying, grinding and sieving the solution C to obtain the copper and cerium composite silver halide / silver photocatalyst. A flue gas demercuration method adopting the copper and cerium composite silver halide / silver photocatalyst comprises the following steps of making reaction liquid containing a copper and cerium codoped silver halide / silver photocatalyst; irradiating the reaction liquid and a mercury-containing flue gas by visible light to carry out demercuration. The preparation method of the copper and cerium composite silver halide / silver photocatalyst and the flue gas demercuration method adopting the copper and cerium composite silver halide / silver photocatalyst have the characteristics of good demercuration effect, low cost and the like, and can be widely applied to the field of atmospheric controlling.

Description

technical field [0001] The invention relates to pollutant prevention technology, in particular to a method for preparing a copper-cerium composite silver halide / silver photocatalyst and a flue gas demercuration method using the catalyst. Background technique [0002] As a green technology, photocatalysis has been paid more and more attention by researchers, and it has important application prospects in energy regeneration and environmental governance. Because semiconductor materials can generate electrons and holes with strong redox ability under the excitation of light, they are often used as photocatalytic materials. However, compared with semiconductor materials, the photosensitive material silver halide AgX has a better photocatalytic effect: AgX is more likely to absorb electron-hole pairs generated by photons, and noble metal Ag, Au and other nanoparticles have surface plasmon resonance effect, with stronger absorption in the visible range. Here, X represents the hal...

AI Technical Summary

Problems solved by technology

There are three main ways to remove mercury: the first is adsorption, which uses activated carbon to adsorb mercury, but it cannot be used for a long time because of its adsorption capacity, and the price is relatively expensive, which affects the commercial value of fly ash; the second is It is a catalytic oxidation method, that is, metal oxides and HCl or O 2 elemental mercury Hg 0 Catalytic oxidation to divalent mercury Hg 2+ After that, it is removed by the absorption liquid, but because this method needs to add an additional mercury removal device, it will increase the operating cost of the coal-fired power station, and the placement of the catalyst is also an urgent problem to be solved; the third method is to use conventional pollutant removal Removal equipment, which removes divalent mercury Hg through wet desulfurization and dedusting equipment 2+ and particulate mercury Hg p , but the method is not sensitive to Hg 0 little effect on removal

[0004] It can be seen that in the prior art, the flue gas mercury removal method has the problem of poor mercury removal effect or high cost.

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