Method for inhibiting photo-corrosion of cadmium sulfide by using composite gold nanoclusters and preparation method thereof

A technology of gold nanoclusters and nanoclusters is applied in the field of photocatalytic material preparation to achieve the effects of excellent photoelectric conversion performance, simple synthesis process and mild reaction conditions

Active Publication Date: 2017-05-31
ANQING NORMAL UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] However, it is currently facing the problem of how to combine gold nanocluster materials with classical photocatalytic materials to prepare composite photocatalysts and apply them in the field of photocatalytic degradation of organic pollutants.

Method used

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  • Method for inhibiting photo-corrosion of cadmium sulfide by using composite gold nanoclusters and preparation method thereof
  • Method for inhibiting photo-corrosion of cadmium sulfide by using composite gold nanoclusters and preparation method thereof
  • Method for inhibiting photo-corrosion of cadmium sulfide by using composite gold nanoclusters and preparation method thereof

Examples

Experimental program
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Embodiment 1

[0032] This embodiment provides a CdS-Au x The preparation method of composite catalyst, it is prepared by the following steps:

[0033] Dissolve 2.6g of cadmium acetate dihydrate in 100ml of deionized water (solution A), equimolar Na 2 S·9H 2 O (2.4g) was dissolved in 100ml deionized water (solution B); extract solution A with a micro-syringe pump, inject it into solution B under stirring conditions, stir for 30min, and let stand overnight;

[0034] Filter the above overnight solution, and wash with distilled water, then transfer the washed solid product into a 100ml hydrothermal kettle, add distilled water to 60% of the volume of the hydrothermal kettle, crystallize at 200°C for 72h, filter, 60 ℃ drying for 10 hours to prepare CdS nanocrystals;

[0035] 4ml HAuCl 4 Add (0.01g / ml) into 50mL distilled water, then add 0.05g L-glutathione, stir until colorless, react at 70°C for 24h, centrifuge, filter; wash with acetonitrile and distilled water three times, place in 5mL Ul...

Embodiment 2

[0044] Dissolve 6.96g of cadmium nitrate tetrahydrate in 100ml of deionized water (solution A), 0.68g (NH 4 ) 2 S was dissolved in 100 deionized water (solution B). Use a micro-injection pump to extract solution A, inject it into solution B under stirring, stir for 30 minutes, and let it stand overnight;

[0045] Filter the above overnight solution and wash with distilled water, then transfer the washed solid product into a 100ml hydrothermal kettle, add distilled water to 60% of the volume of the hydrothermal kettle, crystallize at 120°C for 96h, filter, 70 Dry at ℃ for 8 hours to prepare CdS nanocrystals;

[0046] 5ml HAuCl 4 Add (0.03g / ml) into 50mL of distilled water, then add 0.16g of p-mercaptobenzoic acid, stir until colorless, react at 60°C for 30h, centrifuge, filter, wash with acetonitrile and distilled water three times, and disperse in 5ml of water by ultrasonic, The prepared mass fraction is the dispersion liquid of the gold nanocluster of 0.3%;

[0047] Weig...

Embodiment 3

[0050] Take cadmium chloride and cadmium sulfate 12g that mass ratio is 1:2 and be dissolved in 100ml deionized water (solution A), 0.53g Na 2 S was dissolved in 100 deionized water (solution B). Draw A into the syringe, inject it into solution B with a micro syringe pump under stirring, stir for 50 minutes, and let stand overnight;

[0051] Filter the above overnight solution, wash with distilled water, then transfer the solid to a 100ml hydrothermal kettle, add distilled water to a filling degree of 60%, crystallize at 240°C for 50h, filter, and dry at 50°C to obtain CdS nanocrystals ;

[0052] 5.5ml K(AuCl 4 ) (0.01g / ml) was added to 50mL of distilled water, and 0.075g of phenylethylmercaptan was added, stirred until colorless, reacted at 80°C for 20h, centrifuged, filtered, washed three times with acetonitrile and distilled water, dispersed in 5ml of water by ultrasonic, Forming a dispersion of gold nanoclusters;

[0053] Weigh 0.5g of CdS nanocrystals and ultrasonical...

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Abstract

The invention discloses a method for inhibiting photo-corrosion of cadmium sulfide by using composite gold nanoclusters and a preparation method thereof. The method comprises the following steps: (1) preparing CdS nano crystal grains by using a sulfur source solution and a cadmium source solution through a hydrothermal synthesis method; (2) adding a sulfydryl complex into a gold source solution to prepare a gold nanocluster dispersion solution; and (3) carrying out ultrasonic dispersion on the CdS nano crystal grains to prepare a turbid solution, adding the gold nanocluster dispersion solution, and combining the gold nanoclusters with CdS through nano self-assembly to obtain a CdS-Aux composite catalyst. Compared with the prior art, the method has the advantages that the photocatalytic activity of CdS can be improved, the photo-corrosion of CdS can be effectively inhibited, the photocatalytic activity and the photostability of CdS can be improved at the same time, the CdS is synthesized by a pure liquid phase wet process, the preparation process is simple, the reaction condition is mild, the energy consumption is low, and large-scale popularization and application can be facilitated.

Description

technical field [0001] The invention relates to the technical field of photocatalytic material preparation, in particular to a method for inhibiting cadmium sulfide photocorrosion by composite gold nano-clusters and a preparation method thereof. Background technique [0002] CdS is a good narrow-band semiconductor (2.4eV), which has excellent photoelectric conversion performance for visible light, and is widely used in photoelectric fields such as photosensitive materials, photocatalysts and solar cells. However, CdS has poor photostability and is prone to self-corrosion under light excitation, which greatly reduces the efficiency of photoelectric conversion and greatly limits its application. In addition, due to photocorrosion, part of the photogenerated charge is used to oxidize or reduce the semiconductor itself, which reduces the utilization efficiency of the photogenerated charge and destroys the bulk structure of the semiconductor, introducing toxic heavy metal ions (C...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/04B82Y30/00B82Y40/00C02F1/30C02F101/38
CPCB01J27/04B01J35/004B82Y30/00B82Y40/00C02F1/30C02F2101/38C02F2305/10
Inventor 崔晓峰张晓娜凌山王钧伟高迎春秦伟张元广
Owner ANQING NORMAL UNIV
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