Method for preparing CdS quantum dot/Bi2MoO6/graphene composite photocatalyst

A photocatalyst and graphene technology, applied in the direction of catalyst activation/preparation, physical/chemical process catalyst, chemical instrument and method, etc., can solve the problem of high recombination rate of photogenerated carriers, photocorrosion, and low quantum efficiency of photocatalytic hydrogen production and other problems, to achieve the effect of improving hydrogen production efficiency, low degree of agglomeration, and reducing photoetching performance

Inactive Publication Date: 2017-10-10
HENAN NORMAL UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in practical applications, the photocorrosion phenomenon of CdS quantum dots is serious, and at the same time, due to the high recombination rate of photogenerated carriers, the photocatalytic hydrogen production quantum efficiency is low.

Method used

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  • Method for preparing CdS quantum dot/Bi2MoO6/graphene composite photocatalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] (1) Under stirring conditions, dissolve 0.97g of bismuth nitrate pentahydrate and 0.242g of sodium molybdate dihydrate in 200mL of deionized water to form a mixed solution of bismuth nitrate and sodium molybdate, and combine the bismuth nitrate and sodium molybdate at room temperature. After stirring for 2h, the mixed solution was transferred to the hydrothermal reaction vessel, and then the hydrothermal reaction vessel was placed in a microwave digestion apparatus for microwave reaction at 120°C for 5 minutes. After the reaction was completed, it was cooled, washed, and dried to obtain Bi 2 MoO 6 Nano powder

[0020] (2) Prepare 200mL of 0.01mol / L cadmium acetate solution, add 0.0024mol thioglycolic acid and 0.002mol sodium sulfide to the cadmium acetate solution under stirring and nitrogen to obtain a mixed solution;

[0021] (3) React the mixed solution obtained in step (2) at 65℃ for 2h, and then add 0.135g graphene and 0.001mol of Bi obtained in step (1) 2 MoO 6 Nano pow...

Embodiment 2

[0024] (1) Under stirring conditions, dissolve 1.94g bismuth nitrate pentahydrate and 0.484g sodium molybdate dihydrate in 200mL deionized water to form a mixed solution of bismuth nitrate and sodium molybdate, and combine bismuth nitrate and sodium molybdate at room temperature After stirring for 2h, the mixed solution was transferred to the hydrothermal reaction vessel, and then the hydrothermal reaction vessel was placed in a microwave digestion apparatus for microwave reaction at 120°C for 10 minutes. After the reaction was completed, it was cooled, washed, and dried to obtain Bi 2 MoO 6 Nano powder

[0025] (2) Prepare 200mL of 0.03mol / L cadmium acetate solution, add 0.0072mol thioglycolic acid and 0.006mol sodium sulfide to the cadmium acetate solution under stirring and nitrogen to obtain a mixed solution;

[0026] (3) React the mixed solution obtained in step (2) at 65℃ for 2h, then add 0.135g graphene and 0.002mol of Bi obtained in step (1) 2 MoO 6 Nano powder obtains a sus...

Embodiment 3

[0029] (1) Under stirring conditions, dissolve 0.97g of bismuth nitrate pentahydrate and 0.242g of sodium molybdate dihydrate in 200mL of deionized water to form a mixed solution of bismuth nitrate and sodium molybdate, and combine the bismuth nitrate and sodium molybdate at room temperature. After stirring for 2h, the mixed solution was transferred to the hydrothermal reaction vessel, and then the hydrothermal reaction vessel was placed in a microwave digestion apparatus for microwave reaction at 120°C for 30 minutes. After the reaction was completed, it was cooled, washed, and dried to obtain Bi 2 MoO 6 Nano powder

[0030] (2) Prepare 200mL of 0.05mol / L cadmium acetate solution, add 0.012mol thioglycolic acid and 0.01mol sodium sulfide to the cadmium acetate solution under stirring and nitrogen to obtain a mixed solution;

[0031] (3) React the mixed solution obtained in step (2) at 65℃ for 2h, and then add 0.1g graphene and 0.001mol of Bi obtained in step (1) 2 MoO 6 Nano powder...

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Abstract

The invention discloses a method for preparing a CdS quantum dot/Bi2MoO6/graphene composite photocatalyst and belongs to the technical field of synthesis of inorganic environmental-friendly photocatalytic materials. According to key points of the technical scheme of the present invention, the method for preparing the CdS quantum dot/Bi2MoO6/graphene composite photocatalyst disclosed by the invention comprises the following step: compounding CdS quantum dots, Bi2MoO6 and graphene, to obtain the CdS quantum dot/Bi2MoO6/graphene composite photocatalyst, wherein a molar ratio of the CdS quantum dot to Bi2MoO6 is 1:(0.1-0.5); and the mass ratio of the graphene to Bi2MoO6 is (0.03-0.15):1. According to the CdS quantum dot/Bi2MoO6/graphene composite photocatalyst prepared by the method disclosed by the invention, the recombination rate of photo-induced electrons and holes is effectively reduced, photocatalytic water splitting hydrogen production catalytic activity of the CdS quantum dots is improved, and a light etching phenomenon of the CdS quantum dots in the photocatalytic water splitting process is retarded. Moreover, the method has the advantages of mild operating conditions, low agglomeration degree of the prepared product and high photocatalytic activity.

Description

Technical field [0001] The invention belongs to the technical field of synthesis of inorganic environmental protection photocatalytic materials, and specifically relates to a CdS quantum dot / Bi 2 MoO 6 / Graphene composite photocatalyst preparation method. Background technique [0002] As an efficient and clean green chemical energy, hydrogen energy is of great significance for solving the increasingly tense global energy and environmental crisis. In recent decades, researchers have been committed to the study of hydrogen production technology by photolysis of water and have developed many photocatalytic materials with hydrogen production properties. Among the many photocatalytic materials, CdS quantum dots, as a typical semiconductor nanomaterial, have a narrow band gap, good light utilization and suitable conduction band potential, which have been shown in the research of photocatalytic hydrogen production. Huge application potential. However, in practical applications, the ph...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/051B01J37/00B01J37/08B01J37/34B82Y30/00B82Y40/00C01B3/04C01G11/02C01G39/00
CPCB01J27/051B01J35/004B01J37/00B01J37/088B01J37/34B82Y30/00B82Y40/00C01B3/042C01G11/02C01G39/00C01P2004/64C01P2004/80Y02E60/36
Inventor 刘玉民任豪吕华张鹏
Owner HENAN NORMAL UNIV
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