Titanium dioxide/carbon nitride/Cu-ZSM-5 photocatalyst and preparation method of titanium dioxide/carbon nitride/Cu-ZSM-5 photocatalyst

Abstract

The invention discloses a titanium dioxide / carbon nitride / Cu-ZSM-5 photocatalyst and a preparation method of the titanium dioxide / carbon nitride / Cu-ZSM-5 photocatalyst. The photocatalyst is prepared from the following components in parts by weight: 85-90 parts of catalyst carrier, 10-15 parts of sodium silicate, 5-10 parts of anatase phase titanium oxide, and 0.5-2.0 parts of graphite phase carbonnitride. The preparation method comprises the following steps: (1) washing and drying the catalyst carrier Cu-ZSM-5 for later use; (2) preparing a TiO2 precursor with tetrabutyl titanate as a titanium source; (3) mixing the prepared TiO2 precursor and Cu-ZSM-5 evenly and performing ultrasound treatment for 0.5-1h before drying; (4) mixing a dried product in step (3) with the graphite phase carbonnitride precursor evenly, and roasting by one-step roasting method. (5) soaking a roasted product in step (4) with a sodium silicate solution, pressing for molding, and drying to obtain a formed TiO2 / g-C3N4 / Cu-ZSM-5 photocatalyst. For the preparation method, a doped modified molecular sieve is used as a carrier, anatase phase titanium dioxide is supported by a sol-gel method, and graphite phase carbon nitride is doped, thereby improving photocatalytic desulfurization and denitration efficiency of the catalyst through the synergistic action of the two.

Description

technical field [0001] The present invention relates to a preparation method of photocatalyst, more specifically relates to a method for removing SO in flue gas 2 A photocatalyst for NOx and a preparation method thereof belong to the technical field of environmental protection. Background technique [0002] With the development of industrial production and the increase of motor vehicles, the emissions of sulfur oxides (SOx), nitrogen oxides (NOx) and industrial waste gas VOCs are increasing year by year, causing serious harm to the natural environment and human life. In recent years, on the basis of the exhaust gas part of the original "Industrial "Three Wastes" Emission Trial Standards" and other industry-related national air pollutant emission standards, China has formulated more stringent exhaust gas emission standards. New requirements were put forward. [0003] At present, wet method (lime-gypsum method) desulfurization and SCR denitrification are widely used in indus...

AI Technical Summary

Problems solved by technology

And wet desulfurization treatment of SO 2 A large amount of CO is emitted during the 2 , which is contrary to the content of the Paris Agreement

[0006] 3) Now widely used V 2 o 5 / TiO 2 Catalysts have the disadvantages of easy wear and poisoning, which have not been solved so far

TiO 2 with g-C 3 N 4 There are limitations such as wide band gap, low quantum efficiency, and high recombination rate of electrons and holes, which lead to a single load of TiO 2 with g-C 3 N 4 The catalytic efficiency of photocatalysts is low

At present, the existing photocatalysts often have problems such as agglomeration of active components and weak loading of photocatalysts after mass production due to complex preparation conditions, which makes their actual catalytic efficiency far from the ideal value.

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