Preparation method of CoWO4-CdS one-dimensional nano composite photocatalyst and application of photocatalyst

A nano-composite, photocatalyst technology, applied in the field of photocatalysis, can solve the problems of fast photo-generated carrier recombination rate, reduce visible light catalytic activity, etc., to achieve the effect of improving photocatalytic water splitting efficiency, promoting separation and transfer, and simple equipment

Pending Publication Date: 2021-03-26
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the shortcomings of cadmium sulfide itself, such as the fast recombination rate of photogenerated carriers, reduce its catalytic activity under visible light. Therefore, it is necessary to develop a cadmium sulfide composite material that inhibits the recombination of photogenerated electron-hole pairs to improve its photocatalytic activity.

Method used

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  • Preparation method of CoWO4-CdS one-dimensional nano composite photocatalyst and application of photocatalyst
  • Preparation method of CoWO4-CdS one-dimensional nano composite photocatalyst and application of photocatalyst
  • Preparation method of CoWO4-CdS one-dimensional nano composite photocatalyst and application of photocatalyst

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Experimental program
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Embodiment 1

[0026] 1) Weigh 2mmol of cadmium chloride and 4mmol of sodium diethyldithiocarbamate into a 100mL beaker, add 50mL of deionized water, and stir at a speed of 500r / min for 60min to obtain a suspension A.

[0027] 2) The suspension A was separated by centrifugation at a centrifugal speed of 7000r / min, and the separated solid matter was dried in an oven at 60°C to obtain the precursor B.

[0028] 3) Take 1.124g of precursor B, add 40mL of ethylenediamine, stir at a speed of 400r / min for 60min to form a uniform and stable solution, transfer to a 50mL hydrothermal reaction kettle, keep at 180°C for 24h, cool to room temperature, and obtain a suspension Turbid liquid C.

[0029] 4) Separating the cadmium sulfide in the suspension C by suction filtration, washing with water and alcohol for several times, drying the separated solid matter in an oven at 60° C. to obtain cadmium sulfide nanowires.

[0030] 5) Weigh 100 mg of cadmium sulfide nanowires, add 40 ml of deionized water, and ...

Embodiment 2

[0035] 1) Weigh 2mmol of cadmium chloride and 4mmol of sodium diethyldithiocarbamate into a 100mL beaker, add 50mL of deionized water, and stir at a speed of 500r / min for 60min to obtain a suspension A.

[0036] 2) The suspension A was separated by centrifugation at a centrifugal speed of 7000r / min, and the separated solid matter was dried in an oven at 60°C to obtain the precursor B.

[0037] 3) Take 1.124g of precursor B, add 40mL of ethylenediamine, stir at a speed of 400r / min for 60min to form a uniform and stable solution, transfer to a 50mL hydrothermal reaction kettle, keep at 180°C for 24h, cool to room temperature, and obtain a suspension Turbid liquid C.

[0038] 4) Separating the cadmium sulfide in the suspension C by suction filtration, washing with water and alcohol for several times, drying the separated solid matter in an oven at 60° C. to obtain cadmium sulfide nanowires.

[0039] 5) Weigh 100 mg of cadmium sulfide nanowires, add 40 ml of deionized water, and ...

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Abstract

The invention discloses an in-situ preparation method of a CoWO4-CdS one-dimensional nano composite photocatalyst, which mainly comprises the steps of putting cadmium sulfide nanowires into a certainamount of deionized water, carrying out ultrasonic dispersion, adding cobalt nitrate and sodium tungstate, stirring, transferring into a hydrothermal reaction kettle, keeping at the temperature of 150-200 DEG C for 5-10h, cooling, carrying out suction filtration, washing, drying, and obtaining the CoWO4-CdS one-dimensional nano composite photocatalyst. The composite photocatalyst prepared by adopting an in-situ synthesis method forms heterojunctions between nanowires and nanoparticles, separation and transfer of charges can be promoted, recombination of electron-hole pairs is reduced, and theactivity of hydrogen production by water photolysis of the catalyst is further improved. The preparation method has universality, the required operation is simple, the equipment is simple, the obtained product is uniform, and the overall reaction time is short.

Description

technical field [0001] The invention relates to the technical field of photocatalysis, specifically a CoWO 4 -In situ preparation method of CdS one-dimensional nanocomposite photocatalyst and its application in hydrogen production from water splitting under visible light. Background technique [0002] With the development of industry and the massive burning of fossil fuels, environmental pollution and energy shortages have become the primary problems faced by human beings. The non-renewable and continuous consumption of fossil fuels will inevitably bring about an increasingly severe energy crisis. New energy is undoubtedly the top priority. Solar energy is a clean, non-polluting and infinitely renewable energy source in nature. Many semiconductor catalysts have been developed to produce hydrogen by decomposing water under photocatalytic conditions. Hydrogen is also a clean green energy that plays an important role in the global energy crisis and the focus on the need for a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/049C01B3/04
CPCB01J35/004B01J27/049C01B3/042C01B2203/0277C01B2203/1052Y02E60/36
Inventor 杨明辉匡婉迪孟祥建刘思奇
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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