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Preparation method for SnO2/SnS2 heterostructure photocatalyst

A photocatalyst and heterojunction technology, which is applied in the field of preparation of SnO2/SnS2 heterojunction photocatalysts, can solve the problems of low probability of charge transfer and separation, narrow absorption and utilization wavelength range, and difficult dispersion of semiconductors, etc., to achieve stable contact to conduct charges, the preparation process is simple, and the effect of good photocatalytic activity

Inactive Publication Date: 2012-09-19
SHANGHAI NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But SnO 2 There are still many shortcomings in practical applications: First, although its photochemical properties are relatively stable, due to its wide band gap (the forbidden band width is 3.62eV), the wavelength range for light absorption is narrow, and mainly in In the ultraviolet region, the utilization rate of sunlight is very low; secondly, the semiconductor is not easy to disperse in the organic phase, which will affect its surface area effect, quantum size effect and volume effect, etc., which will lead to high carrier recombination rate and quantum efficiency. lower
However, simply mixing two semiconductor materials cannot make them tightly combined, and they will separate and agglomerate when dispersed in a solution, so the probability of charge transfer and separation at the interface of physically mixed compound semiconductor materials is quite low

Method used

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  • Preparation method for SnO2/SnS2 heterostructure photocatalyst
  • Preparation method for SnO2/SnS2 heterostructure photocatalyst
  • Preparation method for SnO2/SnS2 heterostructure photocatalyst

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Experimental program
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Effect test

Embodiment 1

[0025] (1) Weigh 3.5mmol of SnCl 2 .2H 2 O, ultrasonically dissolved in 10 mL of tert-butanol, added 5 mL of glycerin and 2.25 mL of cyclohexane, stirred, put in a kettle, and put it in an oven at 200 ° C for 18 hours. Centrifuge, wash the precipitate, vacuum dry at 80°C, and then bake at 500°C for 4 hours to obtain SnO 2 nanoparticles.

[0026] (2) At room temperature, select SnO 2 Nanoparticles were dispersed in deionized water, and a sufficient excess of thioacetamide was added thereto, stirred for 30 min, the solution was transferred to a 50 mL hydrothermal kettle, placed in an oven at 160°C for 30 h, and washed repeatedly with deionized water and ethanol, Centrifuge and dry in vacuum at 80°C to obtain the sample.

[0027] attached figure 1 The XRD pattern of the sample obtained for Example 1, compared with the standard XRD card, the SnS 2 It belongs to the hexagonal phase. Depend on figure 2 It can be seen that SnS 2 For the hexagonal nanosheet structure, SnO 2...

Embodiment 2

[0031] The operation steps of Example 1 were repeated, except that L-cysteine ​​was added instead of thioacetamide in step (2). The result was similar to Example 1, but the crystallinity of the sample obtained in Example 1 was lower.

Embodiment 3

[0033] The operation steps of Example 1 were repeated, except that the temperature of the ion exchange reaction in the oven in step (2) was set to 140°C. The result was similar to Example 1, but the crystallinity of the sample obtained in Example 1 was lower.

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Abstract

The invention discloses a preparation method for SnO2 / SnS2 heterostructure photocatalyst. The preparation method includes following steps: (1) preparing SnO2 nanometer particles by an alcohothermal method; and (2) and performing in-situ synthesis for SnO2 / SnS2 into heterostructure in an ion exchange method. The preparation method has the advantages that a preparation process is simple and convenient, controllability of reaction conditions is high, more importantly, SnO2 and SnS2 can be uniformly compounded, and accordingly more stable contact is provided to conduct charge and prevent auto-agglutination. When illuminated by visual light (>420nm), the SnO2 / SnS2 heterostructure photocatalyst has good photocatalysis activity, the photocatalysis activity is the best after the SnO2 / SnS2 heterostructure photocatalyst is heated by a kettle for 30 hours, the degradation degree of the SnO2 / SnS2 heterostructure photocatalyst can basically reach 100% after the SnO2 / SnS2 heterostructure photocatalyst is heated by the kettle for 4 hours, and the preparation method has a potential application value in the aspect of comprehensive ecological improvement, particularly dye wastewater pollution treatment.

Description

technical field [0001] The present invention relates to a kind of SnO 2 / SnS 2 A method for preparing a heterojunction photocatalyst, specifically a SnO with visible light absorption 2 / SnS 2 Preparation method of heterojunction photocatalyst. Background technique [0002] TiO has been reported by Fujishima and Honda since 1972 2 Photocatalytic H production 2 Since then, various semiconductor photocatalytic materials have been successfully prepared, and the research on non-titanium photocatalysts has become increasingly popular in recent years. Among many non-titanium semiconductor materials, SnO 2 It has attracted much attention because of its unique electrical properties, optical properties and chemical stability. But SnO 2 There are still many shortcomings in practical applications: First, although its photochemical properties are relatively stable, due to its wide band gap (the forbidden band width is 3.62eV), the wavelength range for light absorption is narrow, ...

Claims

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Application Information

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IPC IPC(8): B01J27/04
Inventor 李贵生吴玲张岩琛李芳李和兴
Owner SHANGHAI NORMAL UNIVERSITY
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