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Composite graphite phase carbon nitride heterojunction photocatalyst preparation method

A photocatalyst, phase carbon nitride technology, applied in physical/chemical process catalysts, chemical instruments and methods, inorganic chemistry, etc., can solve the problems of limited surface area, low light collection efficiency, and unsatisfactory photocatalytic water splitting activity for hydrogen production , to achieve the effect of common raw materials, increased diffusion range, and excellent photocatalytic performance

Inactive Publication Date: 2019-12-31
SHENYANG INSTITUTE OF CHEMICAL TECHNOLOGY
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  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the single-component g-C 3 N 4 Due to the limited surface area, low light collection efficiency, and rapid recombination of photo-induced charge carriers, the current photocatalytic hydrogen production activity of water splitting is not ideal.

Method used

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  • Composite graphite phase carbon nitride heterojunction photocatalyst preparation method

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Experimental program
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Embodiment 1

[0018] (1) Preparation of g-C by thermal polymerization 3 N 4 . Put urea (50 g) in a covered alumina crucible, put it into a muffle furnace, heat the crucible to 250 °C for 1 h, 350 °C for 2 h, and finally 550 °C for 3 h, the heating rate 2°C / min. The obtained yellow powder was washed with nitric acid (0.1 mol / L) and distilled water to wash away any residual alkaline substances (such as ammonia) adsorbed on the surface of the product, and then the product was dried in an oven at 50 °C for 12 hours to obtain g-C 3 N 4 Nanosheets.

[0019] (2) Ag:ZnIn 2 S 4 / g -C 3 N 4 Synthesis of heterojunction photocatalysts. 148.5 mg g-C was ultrasonically 3 N 4 Disperse in 50 mL of deionized water, then add 71 μL of 0.05 mmol / mL zinc acetate solution, 71 μL of 0.1 mmol / mL indium acetate solution, 26 μL of 0.8 mmol / L silver nitrate solution, 47 μL of 0.01 mmol / mL L-half Cystine and sonicated for 10 min. The mixture was transferred to a 100 mL polytetrafluoroethylene-lined stainl...

Embodiment 2

[0021] As described in Example 1, the difference is that 354 μL of 0.05 mmol / mL zinc acetate solution, 354 μL of 0.1 mmol / mL indium acetate solution, 130 μL of 0.8 mmol / L silver nitrate solution, and 236 μL of 0.01 mmol / mL L-cysteine, 708 μL 0.1 mmol / mL thioacetamide solution, the final catalyst contains 5 wt% Ag:ZnIn 2 S 4 5 wt% of Ag:ZnIn 2 S 4 / g -C 3 N 4 .

Embodiment 3

[0023] As described in Example 1, the difference is that 708 μL of 0.05 mmol / mL zinc acetate solution, 708 μL of 0.1 mmol / mL indium acetate solution, 261 μL of 0.8 mmol / L silver nitrate solution, and 472 μL of 0.01 mmol / mL L-cysteine, 1416 μL 0.1 mmol / mL thioacetamide solution, the final catalyst contains 10 wt% Ag:ZnIn 2 S 4 10 wt% Ag:ZnIn 2 S 4 / g -C 3 N 4 .

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Abstract

The invention discloses a composite graphite phase carbon nitride heterojunction photocatalyst preparation method, relates to a catalyst preparation method, and provides a preparation method of a novel silver ion doped zinc thioindate composite graphite phase carbon nitride (Ag:ZnIn2S4 / g-C3N4) heterojunction photocatalyst for enhancing the photocatalytic activity of visible light, wherein silver nitrate, zinc acetate, indium acetate, thioacetamide and graphite-phase carbon nitride are subjected to a reaction according to a ratio under a hydrothermal condition to obtain the target photocatalyst. According to the invention, the novel visible light photocatalyst is clear in structure and definite in composition; by doping with Ag<+>, the photon utilization rate of ZnIn2S4 can be obviously enhanced; after compounding with g-C3N4, the diffusion range of photon-generated carriers can be enlarged, and the recombination of photon-generated electron-hole pairs is inhibited, so that the catalytic activity of visible light is enhanced; the Ag:ZnIn2S4 / g-C3N4 composite material has wide prospect in the field of clean energy production and energy conversion based on high visible light activity and good hydrogen production capacity; and the obtained catalyst has broad application prospect.

Description

technical field [0001] The invention relates to a preparation method of a catalyst, in particular to a preparation method of a composite graphite phase carbon nitride heterojunction photocatalyst. Background technique [0002] In recent years, environmental pollution and energy crisis have become important issues restricting human development, and solar hydrogen production is an ideal technology to solve the above problems, and has been widely studied due to its high efficiency, sustainable development and resource saving characteristics. Since the original photocatalyst TiO 2 Since its discovery, a large number of semiconductor photocatalysts for hydrogen production have been developed. However, limited photoresponse range, high material cost, complex or time-consuming preparation process, and poor stability are still problems that restrict the practical application of photocatalysts. Therefore, it is crucial to develop an efficient photocatalyst. [0003] Metal sulfides...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/24C01B3/04
CPCB01J27/24C01B3/042C01B2203/0277C01B2203/1076B01J35/39Y02E60/36
Inventor 高雨徐振和钱坤樊苗苗徐宝彤丁茯孙亚光
Owner SHENYANG INSTITUTE OF CHEMICAL TECHNOLOGY
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