Graphene/ZnS-MoS2 nano solid solution photocatalyst having visible light catalytic activity

A catalytic activity and photocatalyst technology, which is applied in physical/chemical process catalysts, chemical/physical processes, light water/sewage treatment, etc., can solve the problems of few reactive sites, limited pollutant molecules, small specific surface area, etc. Achieve the effects of strong light absorption and photocatalytic ability, high stability and regeneration performance, and large specific surface area

Active Publication Date: 2018-10-23
NANCHANG HANGKONG UNIVERSITY
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] ZnS-MoS 2 Nanoparticles are large and in close contact, easy to agglomerate, have a small specific surface area, provide fewer reactive sites, and accommodate limited pollutant molecules, resulting in low photocatalytic efficiency. The purpose of the present invention is to address the existing deficiencies , proposed a one-step solvothermal method to prepare rGO / ZnS-MoS with visible light catalytic activity 2 Nano-solid solution photocatalyst, the introduction of rGO can be used as an electron carrier to promote the separation, transfer and migration of photogenerated electrons and holes, thereby inhibiting the recombination rate of photocarriers; on the other hand, the addition of graphene can inhibit the ZnS-MoS 2 Nanoparticle aggregation, making ZnS-MoS 2 Nanoparticles can grow uniformly on the graphene film, providing more and more ideal reaction sites for photocatalytic reactions

Method used

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  • Graphene/ZnS-MoS2 nano solid solution photocatalyst having visible light catalytic activity
  • Graphene/ZnS-MoS2 nano solid solution photocatalyst having visible light catalytic activity
  • Graphene/ZnS-MoS2 nano solid solution photocatalyst having visible light catalytic activity

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Experimental program
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Effect test

Embodiment 1

[0030] (1) Using graphite powder as raw material, graphene oxide was synthesized by the Hummers method, and then 0.06787 g of graphene oxide was put into 10 mL of N,N-dimethylformamide solution, and ultrasonicated for 30 minutes for later use.

[0031] (2) Add 6.0mmol of zinc acetate, 0.2mmol of sodium molybdate, and 13.3mmol of thioacetamide into 40mL of N,N-dimethylformamide solution and stir until the solution is transparent, then add the above graphene solution.

[0032] (3) Transfer the solution to a 100mL reaction kettle at 210°C for 24 hours.

[0033] (4) The reacted sample was centrifuged and washed several times with deionized water and ethanol, and the obtained sample was vacuum-dried at 60° C. for 12 hours and then ground. The obtained product is rGO / ZnS-MoS 2 Nano solid solution photocatalyst.

Embodiment 2

[0035] (1) Using graphite powder as raw material, graphene oxide was synthesized by the Hummers method, and then 0.04936 g of graphite oxide was weighed into 10 mL of ethylene glycol solution, and ultrasonicated for 40 min for later use.

[0036] (2) Add 6.0mmol of zinc chloride, 0.2mmol of sodium molybdate, and 13.3mmol of thioacetamide into 40mL of ethylene glycol solution and stir until the solution is transparent, then add the above-mentioned graphene solution.

[0037] (3) Transfer the solution to a 100mL reaction kettle at 200°C for a reaction time of 24 hours.

[0038] (4) The reacted sample was centrifuged and washed several times with deionized water and ethanol, and the obtained sample was vacuum-dried at 60° C. for 12 hours and then ground. The obtained product is rGO / ZnS-MoS 2 Nano solid solution photocatalyst.

Embodiment 3

[0040] (1) Using graphite powder as raw material, graphene oxide was synthesized by the Hummers method, and then 0.06787 g of graphene oxide was dispersed into 10 mL of ethanol solution, and ultrasonicated for 60 min for later use.

[0041] (2) Add 5.0mmol of zinc nitrate, 0.25mmol of sodium molybdate, and 11.5mmol of sodium sulfide into 40mL of ethanol solution and stir until the solution is transparent, then add the above-mentioned graphene solution.

[0042] (3) Transfer the solution to a 100mL reaction kettle at 220°C for a reaction time of 24 hours.

[0043] (4) The reacted sample was centrifuged and washed several times with deionized water and ethanol, and the obtained sample was vacuum-dried at 60° C. for 12 hours and then ground. The obtained product is rGO / ZnS-MoS 2 Nano solid solution photocatalyst.

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Abstract

The invention discloses a synthesis method of a graphene / ZnS-MoS2 nano solid solution photocatalyst having visible light catalytic activity. The method includes steps of: preparing graphene oxide (GO)through an improved Hummers method, then dispersing the GO in organic solvent and performing ultrasonic treatment to form a homogenous solution; with inorganic zinc salt, inorganic molybdenum salt and sulfur source as raw materials, successively dissolving the raw materials in an organic solution, and adding the graphene solution prepared before; performing a reaction at 180-220 DEG C so that thenano solid solution ZnS-MoS2 is uniformly adhered to the graphene thin film to form the rGO ZnS-MoS2 nano solid solution photocatalyst combined with chemical bonds. The photocatalyst, when the content of graphene is 5-14%, has excellent visible light catalytic performance. The photocatalyst has large specific surface area, narrow and continuously-adjustable energy gap, can effectively promote separation and migration of photo-induced electron-hole, and has excellent photo-absorption and photo-catalytic activity under visible light.

Description

technical field [0001] The invention relates to a graphene / ZnS-MoS with visible light catalytic activity 2 Preparation method of nanometer solid solution photocatalyst. Background technique [0002] In recent years, the rapid development of my country's industry has brought serious pollution to industrial wastewater. Industrial wastewater is characterized by complex components, high concentrations of refractory organic pollutants, high chroma, and poor biodegradability, which have negative impacts on environmental quality, ecosystem security, and human health. Therefore, how to effectively treat industrial wastewater to meet wastewater discharge standards is an important goal of environmental protection. At present, the treatment methods of industrial wastewater mainly include adsorption method, membrane treatment method, electrochemical method, activated sludge method, ozone oxidation method and photocatalytic degradation method. Among them, photocatalytic degradation te...

Claims

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Application Information

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IPC IPC(8): B01J27/051B01J35/10C02F1/30
CPCC02F1/30B01J27/051C02F2305/10B01J35/61B01J35/39
Inventor 邓芳胡秀芬刘敏
Owner NANCHANG HANGKONG UNIVERSITY
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