Preparation method for stannous sulfide/graphene compound photocatalyst

A graphene composite and photocatalyst technology, applied in chemical instruments and methods, light water/sewage treatment, water/sludge/sewage treatment, etc., can solve the problem of weak redox ability, ineffective degradation of pollutants, band gap Narrow width and other issues, to achieve the effect of wide absorption spectrum range, strong market application value, and stable performance

Inactive Publication Date: 2017-04-19
HENAN NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In the technology of degrading dye wastewater, nano-semiconductor photocatalytic oxidation technology is attracting more and more attention. Among them, stannous sulfide is a photocatalyst that can respond to visible light. Its forbidden band width is 1.3eV, and it can be excited to produce Electron-hole pairs, but their bandgap width is narrow, redox ability is also weak, electron-hole pairs are easy to recombine, and cannot effectively degrade pollutants, so it is a good idea to improve its photocatalytic efficiency by recombining with other substances an effective way

Method used

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  • Preparation method for stannous sulfide/graphene compound photocatalyst

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Experimental program
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Effect test

Embodiment 1

[0010] 1.127g SnCl 2 2H 2 O was dissolved in 50mL of ethylene glycol, and then 0.381g of thiourea was added to the above solution under the condition of magnetic stirring. After continuing to stir for 2h, the mixture was transferred to a polytetrafluoroethylene reactor, and hydrothermally reacted at 160°C for 6h. After the reaction was completed, it was naturally cooled to room temperature, separated by filtration, washed three times with water and ethanol, and then dried in a constant temperature drying oven at 60°C to obtain a stannous sulfide visible light catalyst, marked as GS-0. After 3h 500w Xe lamp visible light irradiation, the decolorization rate of stannous sulfide to RhB was 39.2%.

Embodiment 2

[0012] Add 0.008g of graphene oxide into 50mL of ethylene glycol, sonicate until completely dispersed, then magnetically stir for 2h, and 1.127g of SnCl 2 2H 2 O was added to the above solution, and then 0.381g of thiourea was added to the above solution under the condition of magnetic stirring, and the magnetic stirring was continued for 2 hours, then the mixed solution was transferred to a polytetrafluoroethylene reactor, and hydrothermally reacted at 160°C for 6 hours , naturally cooled to room temperature after the reaction was completed, separated by filtration, washed three times with water and ethanol, and then dried to obtain a stannous sulfide / graphene composite photocatalyst with a mass ratio of graphene and stannous sulfide of 1:100, marked as GS- 1. After 3h 500w Xe lamp visible light irradiation, the decolorization rate of RhB by the stannous sulfide / graphene composite photocatalyst was 42.8%.

Embodiment 3

[0014] Add 0.038g of graphene oxide into 50mL of ethylene glycol, sonicate until it is completely dispersed, then magnetically stir for 2h, and 1.127g of SnCl 2 2H 2 O was added to the above solution, and then 0.381g of thiourea was added to the above solution under the condition of magnetic stirring, and after continuing magnetic stirring for 2h, the mixed solution was transferred to a polytetrafluoroethylene reactor, and reacted hydrothermally at 160°C for 6h, After the reaction was completed, it was naturally cooled to room temperature, separated by filtration, washed three times with water and ethanol, and then dried to obtain a stannous sulfide / graphene composite photocatalyst with a mass ratio of graphene and stannous sulfide of 1:20, marked as GS-2 . After 3h 500w Xe lamp visible light irradiation, the decolorization rate of RhB by the stannous sulfide / graphene composite photocatalyst was 50.7%.

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Abstract

The invention discloses a preparation method for a stannous sulfide / graphene compound photocatalyst. The preparation method includes the specific steps that 0.008-0.377 g of graphene oxide is added in 50 mL of ethanediol, is subjected to ultrasonic processing till being completely dispersed and is then magnetically stirred for 2 h; 1.127 g of SnCl2.2H2O is added in the solution mentioned above; then, 0.381 g of thiourea is added in the solution mentioned above under the magnetic stirring condition; magnetic stirring continues to be conducted for 2 h, and the mixed liquid is transferred in a polytetrafluoroethylene reaction kettle; hydrothermal reaction is conducted for 6 h at the temperature being 160 DEG C; the mixture is naturally cooled to the room temperature after the reaction is completed; filtration and separation are conducted; water washing is conducted three times, and ethyl alcohol washing is conducted three times; and then, drying is conducted, and the stannous sulfide / graphene compound photocatalyst is obtained. The prepared stannous sulfide / graphene compound photocatalyst can improve the light absorptivity, has the beneficial effects of being wide in absorption spectrum range, stable in performance, free of toxin, efficient, low in price, and the like, can be applied to degrading of organic pollutant which is difficult to biodegrade, and has high market application value.

Description

technical field [0001] The invention belongs to the technical field of synthesis of stannous sulfide photocatalytic materials, and in particular relates to a preparation method of a stannous sulfide / graphene composite photocatalyst. Background technique [0002] Dye wastewater is organic wastewater with complex components and difficult to biodegrade. The effective treatment and disposal of dye wastewater is a hot spot for researchers. In the technology of degrading dye wastewater, nano-semiconductor photocatalytic oxidation technology is attracting more and more attention. Among them, stannous sulfide is a photocatalyst that can respond to visible light. Its forbidden band width is 1.3eV, and it can be excited to produce Electron-hole pairs, but their bandgap width is narrow, redox ability is also weak, electron-hole pairs are easy to recombine, and cannot effectively degrade pollutants, so it is a good idea to improve its photocatalytic efficiency by recombining with other ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/04C02F1/30C02F101/30
CPCB01J27/04C02F1/30C02F2101/308
Inventor 孙剑辉禹崇菲董淑英褚亮亮谭露丁旭辉岳小萍杨鹏艳
Owner HENAN NORMAL UNIV
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