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Preparation and application of CdS/Nd2S3 nano composite photocatalytic material with visible-light response

A visible light and photocatalytic technology, which is applied in physical/chemical process catalysts, light water/sewage treatment, water/sludge/sewage treatment, etc., can solve the problems of CdS not being stable enough and not having many applications, and achieve the expansion of photoresponse Effects of range, controlled growth and uniformity, controlled generation rate

Active Publication Date: 2017-09-01
HUNAN INSTITUTE OF SCIENCE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since CdS is not stable enough under light irradiation
Neodymium trisulfide (2.7eV) is a narrow bandgap semiconductor with good chemical stability, but a single Nd 2 S 3 There are not many applications in photocatalytic technology
To overcome the above-mentioned problems of photocatalysts, it is an effective method to adopt modification, modification and compounding.

Method used

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  • Preparation and application of CdS/Nd2S3 nano composite photocatalytic material with visible-light response
  • Preparation and application of CdS/Nd2S3 nano composite photocatalytic material with visible-light response
  • Preparation and application of CdS/Nd2S3 nano composite photocatalytic material with visible-light response

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] (1) Weigh 0.005 mol cadmium nitrate (Cd(NO 3 )·4H 2 O) and 0.01 mmol neodymium nitrate (Nd(NO 3 )·6H 2 O) be dissolved in 100 mL ethylene glycol solution as A solution;

[0026] (2) Add PEG-1000 to the mixed nitrate solution prepared in step (1) as a dispersant, the amount added is 2% of the mass of Cd-Nd-S that can be obtained in reaction theory, stir well until it is completely dissolved ;

[0027](3) Dissolve 0.0051 mol thioacetamide in 100 mL ethylene glycol solution, and use it as solution B after it is completely dissolved;

[0028] (4) Slowly drop solution B into solution A under vigorous stirring, and pass nitrogen gas for 30 minutes after dropping to remove the rest of the gas in the solution;

[0029] (5) Transfer the mixed alcohol solution obtained in step (4) into the reaction kettle, seal it and place it at 120°C for 24 hours of reaction, then take out the reaction kettle, cool it to room temperature, and wash the obtained sample with deionized water a...

Embodiment 2

[0033] (1) Weigh 0.005 mol of cadmium nitrate and 0.02 mmol of neodymium nitrate and dissolve them in 100 mL of glycerol solution as solution A;

[0034] (2) Add PEG-600 to the mixed nitrate solution prepared in step (1) as a dispersant, the amount added is 4% of the mass of Cd-Nd-S that can be obtained in reaction theory, stir well until it is completely dissolved ;

[0035] (3) Dissolve 0.006 mol of thiourea in 100 mL of glycerol solution, and use it as solution B after it is completely dissolved;

[0036] (4) Same as step (4) in implementation example 1;

[0037] (5) Transfer the mixed alcohol solution obtained in step (4) into the reaction kettle, seal it and place it at 140°C. After reacting for 12 hours, take out the reaction kettle and cool it to room temperature. Washing with water several times, drying at 60°C overnight to obtain the sulfide sample precursor;

[0038] (6) Weigh the sample obtained in step (5) and heat it up to 300 °C at a heating rate of 2 °C / min u...

Embodiment 3

[0041] (1) Weigh 0.006 mol of cadmium nitrate and 0.03 mmol of neodymium nitrate and dissolve them in 100 mL of 1,2-propylene glycol solution as solution A;

[0042] (2) Add PEG-400 to the mixed nitrate solution prepared in step (1) as a dispersant, the amount added is 6% of the mass of Cd-Nd-S that can be obtained in reaction theory, stir well until it is completely dissolved ;

[0043] (3) Dissolve 0.008 mol thiosemicarbazide in 100mL of 1,2-propylene glycol solution, and use it as B solution after it is completely dissolved;

[0044] (4) Same as step (4) in implementation example 1;

[0045] (5) Transfer the mixed alcohol solution obtained in step (4) into the reaction kettle, seal it and place it at 130°C. After reacting for 18 hours, take out the reaction kettle and cool it to room temperature. The obtained sample is centrifuged and then deionized Washed with water several times, dried overnight at 60°C to obtain sulfide samples;

[0046] (6) Weigh the sample obtained ...

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Abstract

The invention discloses a preparation method of a CdS / Nd2S3 nano composite photocatalytic material with excellent photocatalytic performance under visible light. The method comprises the following steps: controlling a mass ratio of the substances Cd to Nd to be 100: (0.1-1.0), wherein the addition amount of PEG (Polyethylene glycol) is 2-10% of the mass of the Cd-Nd-S; taking a micro-molecular organic sulfur-containing compound as a sulfur source, wherein the addition ratio of n(M): n(S) is (1.0):(1.0-4.0); taking an alcohol as a solvent, reacting at the temperature of 110-160 DEG C in a reactor for 12-36 hours, washing the product, drying, performing staged temperature programming under gas shield, roasting to the temperature of 300-800 DEG C, and maintaining the temperature for 1-6 hours, thereby obtaining the CdS / Nd2S3 composite sulfide. The invention provides a preparation method of the composite sulfide photocatalytic material, and organic matters can be well degraded under the visible light.

Description

technical field [0001] The invention belongs to the technical field of new materials and their preparation, and relates to a nanocomposite CdS / Nd 2 S 3 Preparation of inorganic materials, which have good photocatalytic properties under visible light irradiation. Background technique [0002] Environmental pollution has become one of the main problems restricting the rapid development of the global economy, especially in terms of water pollution. Countries need to invest a lot of manpower and material resources to deal with it every year. The application of green and environmentally friendly photocatalytic technology to solve this problem has attracted scientists. widespread attention. Photocatalytic technology uses sunlight to decompose or oxidize and reduce organic and inorganic pollutants in water into non-polluting substances. It has the characteristics of low energy consumption and green environmental protection. As far as the existing research is concerned, most phot...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/04C02F1/30
CPCC02F1/30B01J27/04C02F2305/10B01J35/40B01J35/39Y02W10/37
Inventor 张丽梁青满阎建辉戴超华周民杰
Owner HUNAN INSTITUTE OF SCIENCE AND TECHNOLOGY
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