Preparation method of stannic oxide nanocrystalline loaded tin disulfide nanosheet composite nanomaterial

Abstract

The invention discloses a preparation method of a stannic oxide nanocrystalline loaded tin disulfide nanosheet composite nanomaterial. The method comprises the following steps that S1, a tin disulfide nanosheet is prepared, wherein L-cysteine and stannic chloride are dissolved in water and are mixed evenly, light yellow sediment is obtained after a hydrothermal reaction, rinsing, centrifugal separation and drying are carried out, and the SnS2 nanosheet is obtained; S2, a composite material is prepared, wherein stannic chloride and vitamin C are dissolved in water, the SnS2 nanosheet prepared in the S1 is dispersed in the solution, then NaHCO3 is added, even mixing is carried out, a microwave reaction is carried out under the backflow condition, cooling, rinsing, centrifugal separation and drying are carried out, and the composite nanomaterial SnO2 / SnS2 is obtained. The molar ratio of the L-cysteine to the stannic chloride added in the S1 is 6-8:1, and the molar ratio of the stannic chloride added in the S2 to the SnS2 nanosheet is 1-5:1. According to the prepared SnO2 / SnS2 composite material, SnO2 nanocrystalline is evenly dispersed and firmly loaded on the SnS2 nanosheet, the caking phenomenon of the SnO2 nanocrystalline is avoided, and the obviously-enhanced catalytic property is shown.

Description

technical field [0001] The invention belongs to the technical field of preparation of inorganic micro-nano materials, and in particular relates to a preparation method of tin disulfide nanosheet-loaded tin dioxide nanocrystal composite nanomaterials. Background technique [0002] In contemporary society, photocatalytic degradation of organic pollutants and heavy metal ions in water has received extensive attention in recent years. Tin dioxide (SnO 2 ) is regarded as a commercial titania catalyst TiO due to its relatively good photocatalytic stability and catalytic activity. 2 potential substitutes. SnO 2 The catalyst performed well under ultraviolet light, but its band gap (Eg = 3.6 eV) was large, so its catalytic activity under visible light was limited. Since the proportion of ultraviolet light energy in solar energy is very small, only about 4%, but the energy of visible light reaches 43%, so the SnO 2 It is meaningful that the photoresponse range of the catalyst e...

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Problems solved by technology

In addition, SnO2 materials have an inherent defect in the process of photocatalytic degradation: the electron / hole pairs generated by SnO2 will recombine in large quantities under light irradiation, Therefore, only a small number of electron / hole pairs can be utilized by the photocatalytic reaction

The two-step method is to prepare tin dioxide nanoparticles first, and then partially vulcanize them into tin disulfide in the solution. The disadvantage is that the degree of vulcanization is difficult to control, and the nanoparticles are easy to agglomerate.

The one-step method is to react different ratios of tin salts and sulfur sources through hydrothermal reaction to prepare composite materials. Although the degree of vulcanization can be controlled, the prepared nanoparticles are still easy to agglomerate.

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