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Heterojunction photocatalyst and preparation method thereof

A photocatalyst and heterojunction technology, which is applied in the field of photoelectrochemical materials and photocatalysis, can solve the problems of easy decomposition, difficulty in repeated collection of SnS2, and insufficient photocatalytic activity, and achieve excellent light absorption performance, strong stability, and strong The effect of the photoelectrochemical response

Active Publication Date: 2017-08-11
GUILIN UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although SnS with a narrow bandgap energy 2 It can efficiently utilize visible light and has high photocatalytic activity, and is regarded as a photocatalyst with great application potential; however, SnS 2 The photocatalytic activity is still not high enough, and it is easy to decompose itself
In addition, after the photocatalytic reaction, SnS 2 It is more difficult to collect again and again

Method used

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  • Heterojunction photocatalyst and preparation method thereof
  • Heterojunction photocatalyst and preparation method thereof
  • Heterojunction photocatalyst and preparation method thereof

Examples

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Effect test

Embodiment 1

[0017] (1) Add 4mmol of tin tetrachloride and 8mmol of thioacetamide into 40mL of distilled water, mix well and add into a PTFE reactor with a volume of 50mL, react at 180°C for 24 hours, and cool naturally After reaching room temperature, they were washed by centrifugation with distilled water and absolute ethanol for 2 to 3 times, and vacuum-dried at 60°C to obtain SnS 2 Nanosheets;

[0018] (2) 0.5g SnS synthesized in step (1) 2 Put nanosheets into a 500mL beaker, measure 300mL of distilled water into the beaker, and ultrasonically disperse for 3 hours to form a uniform yellow dispersion; then measure 0.01mol / L Na 2 Add 3mL of S solution into the beaker, stir for 10 minutes, then measure 4mL of 0.1mol / L silver nitrate solution, slowly add it into the beaker drop by drop, finish adding dropwise in 30 minutes, keep stirring for 3 hours, and finally keep the temperature at 30°C for 2 hours, a brown precipitate was obtained, which was Ag 2 S / SnS 2 heterojunction photocataly...

Embodiment 2

[0021] (1) Add 2mmol of tin tetrachloride and 4mmol of sodium sulfide into 40mL of distilled water, mix well and add into a 50mL polytetrafluoroethylene reactor, react at 180°C for 24 hours, and cool to room temperature naturally Afterwards, they were centrifuged and washed 2 to 3 times with distilled water and absolute ethanol respectively, and vacuum-dried at 60°C to obtain SnS 2 Nanosheets;

[0022] (2) 0.5g SnS synthesized in step (1) 2 Put nanosheets into a 500mL beaker, measure 300mL of distilled water into the beaker, and ultrasonically disperse for 3 hours to form a uniform yellow dispersion; then measure 0.01mol / L Na 2 Add 3 mL of S solution into the beaker, stir for 10 minutes, then measure 1 mL of 0.1 mol / L silver acetate solution, slowly add it into the beaker drop by drop, finish adding in 30 minutes, keep stirring for 3 hours, and finally keep the temperature at 30°C for 2 hours, a brown precipitate was obtained, which was Ag 2 S / SnS 2 heterojunction photocat...

Embodiment 3

[0024] (1) Add 10mmol of tin tetrachloride and 20mmol of thiourea into 40mL of distilled water, mix well and add into a polytetrafluoroethylene reactor with a volume of 50mL, react at 180°C for 24 hours, and cool to room temperature naturally Afterwards, they were centrifuged and washed 2 to 3 times with distilled water and absolute ethanol respectively, and vacuum-dried at 60°C to obtain SnS 2 Nanosheets;

[0025] (2) 0.5g SnS synthesized in step (1) 2 Put nanosheets into a 500mL beaker, measure 300mL of distilled water into the beaker, and ultrasonically disperse for 3 hours to form a uniform yellow dispersion; then measure 0.01mol / L Na 2 Add 3 mL of S solution into the beaker, stir for 10 minutes, then measure 4 mL of 0.1 mol / L silver benzoate solution, slowly add it to the beaker drop by drop, finish adding in 30 minutes, still stir for 3 hours, and finally 30 ℃ Keep the temperature for 2 hours to get a brown precipitate, which is Ag 2 S / SnS 2 heterojunction photocatal...

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Abstract

The invention discloses an Ag2S / SnS2 heterojunction photocatalyst and a preparation method thereof. The preparation method comprises the following steps: synthesizing SnS2 nanosheets through a hydrothermal technology, adding silver ions into an aqueous solution containing the SnS2 nanosheets, and carrying out an ion exchange reaction on the silver ions and tin disulfide to obtain the Ag2S / SnS2 heterojunction composite photocatalyst. The combination of Ag2S nanoparticles and the SnS2 nanosheets significantly enhances the photoelectric properties and the photocatalytic properties of the Ag2S nanoparticles and the SnS2 nanosheets, and the photovoltaic density of the Ag2S(8wt%) / SnS2 compound is 2 times that of the SnS2. The methyl orange photocatalytic degradation activity of the heterojunction is obviously better than that of the Ag2S and the SnS2 nanosheets. The method has the advantages of simplicity in operation, mild conditions and high yield; and the prepared SnS2 ultrathin nanosheets have very high photocatalytic activity.

Description

technical field [0001] The technical field of the invention belongs to the technical field of photocatalysis and photoelectrochemical materials, and particularly relates to the development and preparation method of tin disulfide heterojunction photocatalyst. Background technique [0002] SnS 2 As a semiconductor material with good optoelectronic properties, its direct band gap is 1.91-2.4eV, and the two-dimensional layered SnS 2 It has optical anisotropy and excellent chemical stability. 2D SnS 2 Due to the relatively large layer spacing and lattice vacancies of nanosheets, SnS 2 It is also used as a photocatalyst to decompose organic pollutants or heavy metal ions in wastewater, mainly because of its high light absorption, non-toxicity, high oxidation resistance and chemical stability. Although SnS with narrow bandgap energy 2 It can efficiently utilize visible light and has high photocatalytic activity, and is regarded as a photocatalyst with great application potenti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/04C02F1/30C02F101/30
CPCC02F1/30B01J27/04B01J37/031C02F2101/308C02F2305/10B01J35/39Y02W10/37
Inventor 刘勇平耿鹏吕慧丹王吉祥林剑飞
Owner GUILIN UNIVERSITY OF TECHNOLOGY
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