Preparation method for graphene quantum dot/SnS2 nano-sheet composite photocatalyst

A technology of graphene quantum dots and composite light, applied in the field of photoelectrochemical materials and photocatalysis, can solve the problems of easy decomposition, insufficient photocatalytic activity, difficulty in repeated collection of SnS2, etc., and achieve excellent light absorption performance, strong photoelectrochemical properties, etc. Responsiveness, the effect of large application potential

Inactive Publication Date: 2017-08-01
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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  • Preparation method for graphene quantum dot/SnS2 nano-sheet composite photocatalyst
  • Preparation method for graphene quantum dot/SnS2 nano-sheet composite photocatalyst
  • Preparation method for graphene quantum dot/SnS2 nano-sheet composite photocatalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] A simple one-step hydrothermal method is adopted: measure 2ml of graphene quantum dots with a concentration of 2mg / ml and add them to 40°C distilled water, weigh 4.4mmol of thioacetamide and 2mmol of tin tetrachloride, and put them together into The aqueous solution of quantum dots was stirred for 30 minutes, then put into a reaction kettle, and heated at 160° C. for 8 hours. Take out the reaction kettle and cool it down to room temperature, then centrifuge the solution to remove unreacted substances, obtain a precipitate and dry it in vacuum for 6 hours to obtain the product.

[0018] As-prepared SnS 2 Thin nanosheet dispersion liquid, make photoelectrode on ITO surface by spin-coating method, prepare electrode as working electrode (area is 1cm 2 ), the auxiliary electrode is a platinum electrode, and the saturated calomel electrode (SCE) is used as a reference electrode, 0.5mol / LNa 2 SO 4 In order to support the electrolyte solution, the photoelectrochemical perfor...

Embodiment 2

[0021] (1) Measure 8ml of graphene quantum dots with a concentration of 2mg / ml and add them to 40°C distilled water, weigh 8.8mmol thiourea and 4mmol tin tetrachloride, put them into the aqueous solution containing hydroxyl-graphene quantum dots and stir for 30 Minutes later, put it into a reaction kettle and heat at 120°C for 24 hours. Take out the reaction kettle and cool it down to room temperature, then centrifuge the solution to remove unreacted substances, obtain a precipitate and dry it in vacuum for 6 hours to obtain the product.

[0022] (2) Synthetic GQDs / SnS 2 The photocurrent of the heterojunction is SnS 2 3 times the photocurrent. It takes 45 minutes to degrade methyl orange to reach more than 99%.

Embodiment 3

[0024] (1) Measure 2ml of graphene quantum dots with a concentration of 2mg / ml and add them to 40°C distilled water, weigh 2.2mmol sodium sulfide and 1mmol tin tetrachloride, put them into the aqueous solution containing amino-graphene quantum dots and stir for 30 Minutes later, put it into a reaction kettle and heat at 160°C for 24 hours. Take out the reaction kettle and cool it down to room temperature, then centrifuge the solution to remove unreacted substances, obtain a precipitate and dry it in vacuum for 6 hours to obtain the product.

[0025] (2) Synthetic GQDs / SnS 2 The photocurrent of the heterojunction is SnS 2 4 times the photocurrent. It takes 35 minutes to degrade methyl orange to more than 99%.

[0026] The purity of the chemical reagents described in the above examples is chemically pure.

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Abstract

The invention discloses a GQDs / SnS2 heterojunction photocatalyst and a preparation method thereof. A simple one-step hydrothermal method comprises the following steps: adding a graphene quantum dot into an aqueous solution containing a sulfur source and stannic chloride (the molar ratio of the sulfur source to the stannic chloride is 2.2 to 1); performing a hydrothermal reaction at the temperature of 120 to 180 DEG C for a certain while to obtain the GQDs / SnS2 heterojunction photocatalyst. Through combination of GQDs and a SnS2 nanosheet, the photoelectric performance and photocatalytic performance of the GQDs and the SnS2 nanosheet are enhanced remarkably, and the photo-generated current density is 5 times that of pure SnS2. The activity in heterojunction photocatalytic degradation of methylic orange is superior to that of the SnS2 nanosheet. The method is easy and convenient to operate, is mild in conditions, and has high yield; the prepared GQDs / SnS2 ultrathin nanosheet has very high photocatalytic and photo-electrochemical oxygen evolution capabilities.

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] Tin disulfide not only has very abundant reserves on the earth, the structure of tin disulfide is similar to a sandwich, that is, tin atoms are sandwiched between two layers of close sulfur atoms to form a sandwich structure. The structure of tin disulfide makes it have excellent optical properties, electrical properties and good catalytic properties. SnS 2 As a semiconductor material with good optoelectronic properties, its direct band gap is 1.91-2.4eV, two-dimensional 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 l...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/04B82Y30/00C02F1/30C02F101/34C02F101/38C02F101/30
CPCY02W10/37B01J27/04B01J35/004B82Y30/00C02F1/30C02F2101/308C02F2101/34C02F2101/38C02F2305/10
Inventor 刘勇平米喜红吕慧丹耿鹏王吉祥林剑飞
Owner GUILIN UNIVERSITY OF TECHNOLOGY
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