Preparation method of VS2/CdS composite photocatalyst

A technology of catalyst and composite light, applied in catalyst activation/preparation, physical/chemical process catalysts, chemical instruments and methods, etc., can solve the problems of inhomogeneous distribution, unfavorable large-scale promotion, expensive precious metals, etc., and achieve accelerated migration rate. , The effect of improving photocatalytic performance and increasing specific surface area

Active Publication Date: 2019-10-25
SHAANXI UNIV OF SCI & TECH
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Problems solved by technology

[0004]At present, some researchers use gold, silver, platinum and other precious metals to combine with semiconductors, which can effectively reduce the electron-hole recombination rate, but the high price of precious metals is not conducive to large-scale promotion , and the co-catalysts such as noble metals are not evenly distributed on the surface of semiconductor photocatalysts

Method used

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  • Preparation method of VS2/CdS composite photocatalyst
  • Preparation method of VS2/CdS composite photocatalyst
  • Preparation method of VS2/CdS composite photocatalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] A VS 2 The preparation method of / CdS composite photocatalyst comprises the following steps:

[0028] Step 1: Take 0.5mol cadmium acetate, 2mol ammonium metavanadate, and 8mol thioacetamide and mix to obtain a mixture;

[0029] Step 2: Add 40ml of deionized water to the mixture and stir magnetically for 15min at a rotating speed of 500r / min. At this time, the concentration of cadmium ions is 0.0125mol / L, the concentration of vanadium ions is 0.05mol / L, and the concentration of sulfide ions 0.2mol / L; then add 8ml of ammonia water and stir magnetically at 500r / min for 0.5h to obtain solution A;

[0030] Step 3: Put the solution A into the polytetrafluoroethylene liner and seal it and place it in the reactor in a homogeneous reactor, and conduct a hydrothermal reaction at 140°C for 18 hours. During this process, vanadium ions combine with sulfide ions to form disulfide Vanadium, cooled to room temperature; secondary hydrothermal reaction at 170°C for 5 hours, during this ...

Embodiment 2

[0034] A VS 2 The preparation method of / CdS composite photocatalyst comprises the following steps:

[0035] Step 1: Take 1mol cadmium acetate, 3mol ammonium metavanadate, and 9mol thioacetamide and mix to obtain a mixture;

[0036] Step 2: Add 45ml of deionized water to the mixture and stir magnetically for 15min at a rotating speed of 600r / min. At this time, the concentration of cadmium ions is 0.0222mol / L, the concentration of vanadium ions is 0.0667mol / L, and the concentration of sulfide ions 0.2mol / L; then add 9ml of ammonia water and stir magnetically at 600r / min for 1h to obtain solution A;

[0037] Step 3: Put solution A into a polytetrafluoroethylene liner and seal it and place it in a reactor in a homogeneous reactor, and conduct a hydrothermal reaction at 145°C for 19 hours. During this process, vanadium ions combine with sulfide ions to form disulfide Vanadium, cooled to room temperature; secondary hydrothermal reaction at 175°C for 6 hours, during this process, c...

Embodiment 3

[0040] A VS 2 The preparation method of / CdS composite photocatalyst comprises the following steps:

[0041] Step 1: Take 1.5mol cadmium acetate, 3.5mol ammonium metavanadate, and 9.5mol thioacetamide and mix to obtain a mixture;

[0042] Step 2: Add 50ml of deionized water to the mixture and stir magnetically for 20min at a speed of 700r / min. At this time, the concentration of cadmium ions is 0.03mol / L, the concentration of vanadium ions is 0.07mol / L, and the concentration of sulfide ions 0.19mol / L; then add 9ml of ammonia water and magnetically stir for 1h at a speed of 700r / min to obtain solution A;

[0043] Step 3: Put solution A into a polytetrafluoroethylene liner and seal it and place it in a reactor in a homogeneous reactor, and conduct a hydrothermal reaction at 150°C for 20 hours. During this process, vanadium ions combine with sulfide ions to form disulfide Vanadium, cooled to room temperature; secondary hydrothermal reaction at 170 ° C for 7 hours, during which ca...

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Abstract

The invention discloses a preparation method of a VS2 / CdS composite photocatalyst. The preparation method comprises the steps that 0.5-2 mol of cadmium acetate, 2-4 mol of ammonium metavanadate, and 8-10 mol of thioacetamide are taken and mixed, and thus a mixture is obtained; 40-60 ml of deionized water is added into the mixture, primary stirring is conducted, then 8-10 ml of ammonium hydroxide is added, secondary stirring is conducted, dissolution is conducted, and a solution A is obtained; the solution A is placed in a reaction kettle for primary hydrothermal reaction at the temperature of140-160 DEG C, the solution A is cooled to the room temperature, secondary hydrothermal reaction is conducted at the temperature of 160-180 DEG C, and the solution A is cooled to the room temperatureto obtain a solution B; and the solution B is taken out and subjected to suction filtration, then a filtered object is dried and ground into powder, and the VS2 / CdS composite photocatalyst is obtained. The preparation method is easy to operate, short in consumed time, low in preparation cost and high in product purity, and the prepared photocatalyst is excellent in performance.

Description

technical field [0001] The invention belongs to the technical field of inorganic material preparation and relates to a VS 2 / CdS composite photocatalyst preparation method. Background technique [0002] With the rapid development of industry and the massive burning of fossil fuels, the problems of environmental pollution and energy shortage faced by human beings have become increasingly prominent. Various pollutants are directly discharged into the agricultural environment, which will not only affect agricultural production, but also affect human health. At the same time, the massive consumption of fossil fuels will also bring about an increasingly severe energy crisis, and the search for new clean energy has become the goal pursued by mankind. Using solar energy is an effective way to obtain renewable resources. Photoelectric conversion, photothermal conversion, and photochemical conversion can all achieve the purpose of storing and using solar energy. Photocatalytic tech...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/04B01J35/10B01J37/10C01B3/04
CPCB01J27/04B01J37/10B01J35/004B01J35/1004C01B3/042C01B2203/1041C01B2203/0277Y02E60/36
Inventor 曹丽云牛梦凡黄剑锋冯亮亮冯永强赵亚娟肖婷张晓
Owner SHAANXI UNIV OF SCI & TECH
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