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A kind of nanometer material and preparation method based on molybdenum sulfide efficient photocatalysis to prepare hydrogen

A nano-material, molybdenum sulfide technology, applied in the field of catalysis, can solve the problems of low efficiency of plasma-enhanced catalysis, achieve significant catalytic effect, improve light absorption, and reduce costs

Active Publication Date: 2018-10-19
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the plasmon-enhanced catalytic efficiency of this complex is still low

Method used

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  • A kind of nanometer material and preparation method based on molybdenum sulfide efficient photocatalysis to prepare hydrogen
  • A kind of nanometer material and preparation method based on molybdenum sulfide efficient photocatalysis to prepare hydrogen

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Experimental program
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Embodiment 1

[0021] Mix 200 μl of chloroauric acid solution (50 mg / ml) with 100 ml of deionized water, heat to boiling, then add dropwise 700 μl of sodium citrate solution (1 wt %), and heat for 10 minutes to obtain a gold nanoparticle solution. 0.5 g of cysteine ​​was dissolved in 100 ml of deionized water to obtain solution A. Dissolve 0.5-1.0 g of sodium molybdate in 100 ml of deionized water to obtain solution B. Solution A and solution B were mixed and sonicated for 2-4 hours at a volume ratio of 2:1. Add 40-80ml of gold nanoparticle solution into 10ml of 1% polyethylene glycol solution, and then mix with the above-mentioned ultrasonic mixture of A and B, and then carry out hydrothermal reaction at 200°C for 10h. After the reaction, the solution was dried in an oven at 110°C for 24 hours to obtain a gold nanoparticle / molybdenum sulfide core-shell nanomaterial.

[0022] Characterization: Take 0.1 g of gold nanoparticles / molybdenum sulfide core-shell nanomaterials and disperse them in...

Embodiment 2

[0024] Mix 200 μl of chloroauric acid solution (70 mg / ml) with 100 ml of deionized water, heat to boiling, then add dropwise 700 μl of sodium citrate solution (2 wt %), and heat for 15 minutes to obtain a gold nanoparticle solution. 0.7 g of cysteine ​​was dissolved in 100 ml of deionized water to obtain solution A. 0.7 g of sodium molybdate was dissolved in 100 ml of deionized water to obtain solution B. Solution A and solution B were mixed and sonicated for 2-4 hours at a volume ratio of 2:1. 50ml of gold nanoparticle solution was added to 20ml of 2% polyethylene glycol solution, then mixed with the ultrasonic mixture of A and B above, and then subjected to hydrothermal reaction at 200°C for 16h. After the reaction, the solution was dried in an oven at 110°C for 36 hours to obtain a gold nanoparticle / molybdenum sulfide core-shell nanomaterial.

[0025] Characterization: Take 0.1 g of gold nanoparticles / molybdenum sulfide core-shell nanomaterials and disperse them in 100 ml...

Embodiment 3

[0027] Mix 200 μl of chloroauric acid solution (80 mg / ml) with 100 ml of deionized water, heat to boiling, then add dropwise 700 μl of sodium citrate solution (3 wt %), and heat for 10 minutes to obtain a gold nanoparticle solution. 0.8 g of cysteine ​​was dissolved in 100 ml of deionized water to obtain solution A. 0.8 g of sodium molybdate was dissolved in 100 ml of deionized water to obtain solution B. Solution A and solution B were mixed and sonicated for 2-4 hours at a volume ratio of 2:1. Add 60ml of gold nanoparticle solution into 30ml, 3%, polyethylene glycol solution, and then mix with the above-mentioned ultrasonic mixture of A and B, and then carry out hydrothermal reaction at 200°C for 18h. After the reaction, the solution was dried in an oven at 110°C for 48 hours to obtain a gold nanoparticle / molybdenum sulfide core-shell nanomaterial.

[0028] Characterization: Take 0.1 g of gold nanoparticles / molybdenum sulfide core-shell nanomaterials and disperse them in 10...

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Abstract

The invention relates to a molybdenum sulfide-based nano-material for high-efficiency photocatalytic preparation of hydrogen and a preparation method thereof. According to the invention, gold nano-particles are added into a nano-material of molybdenum sulfide, so the range of visible light absorption is broadened, and a photon-generated carrier is allowed to be transported to the gold nano-particles, which enables the defect of proneness to compounding of the photon-generated carrier of molybdenum sulfide to be further overcome; and the gold nano-particles are in a polymer state, the number of the gold nano-particles is 2 to 6, and distance among the gold nano-particles is 5 to 7 nm. Such short distance enables strong coupling effect to be produced among particles, so light absorption is further improved. Meanwhile, a one-step hydrothermal method is employed for preparation, so the process of complex preparation is omitted and cost is substantially reduced. The nano-material has substantial catalytic effect as a catalyst for photocatalytic preparation of hydrogen and can further promote wide application of the technology of photocatalytic preparation of hydrogen.

Description

technical field [0001] The invention belongs to the field of catalysis, and relates to a nanometer material and a preparation method for preparing hydrogen by efficient photocatalysis based on molybdenum sulfide. Background technique [0002] In order to solve the current energy crisis, the field of photocatalytic hydrogen production has also received extensive attention and research. From the original titanium dioxide and cadmium sulfide to the widely studied two-dimensional materials, nanomaterials for photocatalytic hydrogen production have been greatly developed. However, the catalytic efficiency of the catalyst is still not effectively improved. At present, in the preparation of photocatalysts, efficient catalysts are still the focus of research and development. (X. Xie, K. Kretschmer, G. Wang, Nanoscale 2015, 7, 13278. Y. Yan, B. Xia, Z. Xu, X. Wang, ACS Catal. 2014, 4, 1693.). [0003] In recent years, molybdenum sulfide has been extensively studied as a good catal...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J27/051C01B3/04
CPCB01J27/051B01J35/004B01J35/006B01J35/0073C01B3/042C01B2203/1041Y02E60/36
Inventor 李炫华郭绍辉朱金萌仝腾腾魏秉庆
Owner NORTHWESTERN POLYTECHNICAL UNIV
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