g-C3N4/TiO2@montmorillonite photocatalyst and preparation method thereof

Abstract

The invention relates to a g-C3N4 / TiO2@montmorillonite photocatalyst and a preparation method thereof, and belongs to the field of deep processing of nonmetallic mineral materials and environment engineering. With organic montmorillonite interlayer space as a micro reaction area, precursors of g-C3N4 and TiO2 are induced by a modifying agent in the interlayer space to enter a montmorillonite interlayer, nanometer g-C3N4 / TiO2 heterojunction is generated in the montmorillonite interlayer through further hydrolysis, dehydroxylation and crystallization, and then the visible-light response montmorillonite-based composite photocatalysis material is obtained. By means of the method, the combination of montmorillonite and the visible-light response g-C3N4 / TiO2 heterojunction is achieved, the pollutant adsorption and capture performance of the material and the dispersibility of the catalyst are improved through the carrier effect of montmorillonite. The load type photocatalysis material has excellent photocatalysis activity under visible light, and has great potential application value in the field of deep processing of organic waste water.

Description

technical field [0001] The invention relates to a montmorillonite composite g-C 3 N 4 / TiO 2 heterojunction (g-C 3 N 4 / TiO 2 The invention discloses a montmorillonite) photocatalyst and a preparation method thereof, which belong to the field of deep processing of non-metallic mineral materials and environmental engineering. Background technique [0002] In today's society, environmental pollution is a major challenge that human beings face and urgently need to be solved. Photocatalytic technology can use solar energy to degrade and mineralize various pollutants in water and air, and is an ideal environmental pollution control technology. TiO 2 Due to its non-toxicity, good stability, and excellent catalytic ability, photocatalytic materials have always been a hot spot in research and development at home and abroad, but in the process of large-scale practical use, there are still the following problems: low quantum efficiency, photogenerated electron-hole polarity Ea...

AI Technical Summary

Problems solved by technology

TiO 2 Due to its non-toxicity, good stability, and excellent catalytic ability, photocatalytic materials have always been a hot spot in research and development at home and abroad, but in the process of large-scale practical use, there are still the following problems: low quantum efficiency, photogenerated electron-hole polarity Easy to recombine; high band gap energy (Eg 锐钛型 =3.2eV), can only use ultraviolet light accounting for about 4% of sunlight; small specific surface area, poor adsorption capacity; small particle size, difficult to separate and recover

The ammonium fluoride used in the preparation process of this preparation method is a highly toxic substance, and the requirements for reaction equipment are relatively high, so there are certain potential safety hazards

The following two documents: (1) N.Boonprakob, N.Wetchakun, S.Phanichphant, D.Waxler, P.Sherrell, A.Nattestad, J.Chen, B.Inceesungvorn, Enhancedvisible-lightphotocatalyticactivityofg-C 3 N 4 / TiO 2 films, Journal of Colloid and Interface Science, 417 (2014) 402-409; (2) S. Zhao, S. Chen, H. Yu, X. Quan, g-C 3 N 4 / TiO 2 hybrid photocatalyst with wide absorption wavelength range and effective photogenerated charge separation, Separation and Purification Technology, 99 (2012) 50-54. The g-C 3 N 4 / TiO 2 composite catalysts, but most of these studies are only g-C 3 N 4 with TiO 2 However, there are no literature reports on how to solve the problems of easy agglomeration, small specific surface area and difficult recovery of catalysts.

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