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Porous two-dimensional zinc cadmium sulfide nanosheet as well as preparation method and application thereof

A technology of zinc cadmium sulfide and nanosheets, which is applied in chemical instruments and methods, inorganic chemistry, chemical/physical processes, etc., can solve the problems of complex preparation methods, difficult recycling of quantum dot systems, and high equipment requirements, so as to facilitate diffusion The effect of mass transfer, more reactive sites, and uniform distribution of pores

Active Publication Date: 2020-04-10
NORTHWEST UNIV(CN)
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Chinese patent CN 109621978 A provides a preparation method of ZnS nanosheet photocatalyst film, but its preparation method is complicated, equipment requirements are high, and cost is high; and the prepared ZnS nanosheet thickness is thicker, reaching 100nm; The photocatalytic activity is low and needs to be further improved
Chinese patent CN106622289 B discloses a nanomaterial composited with CdZnS quantum dots and carbon dots and its preparation method and is applied to photolysis of water to produce hydrogen, but the prepared CdZnSQDs / C QDS composites are severely agglomerated, resulting in optimal hydrogen production The activity is only 2063μmol·g -1 h -1 , and the quantum dot system is extremely difficult to recycle in aqueous solution
Literature (J.Mater.Chem.A,2017,5,14682, Dramatic enhancement of the photocatalytic activity of Cd 0.5 Zn 0.5 Snanosheets via phosphorization calculation for visible-light-driven H 2 evolution) reported a ZnP-loaded Cd 0.5 Zn 0.5 S nanosheets, but the prepared sample blocks are larger, thicker, and the size of the nanosheets is not uniform.

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  • Porous two-dimensional zinc cadmium sulfide nanosheet as well as preparation method and application thereof
  • Porous two-dimensional zinc cadmium sulfide nanosheet as well as preparation method and application thereof
  • Porous two-dimensional zinc cadmium sulfide nanosheet as well as preparation method and application thereof

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preparation example Construction

[0029] The invention provides a porous two-dimensional Cd x Zn 1-x The preparation method of S nanosheet, comprises the following steps:

[0030] Zinc salt, ethylenediamine aqueous solution and sulfur source are mixed, carry out the first solvothermal reaction, obtain zinc sulfide-ethylenediamine (abbreviated as ZnS(en) 0.5 )Precursor;

[0031] The ZnS(en) 0.5 Precursor, cadmium salt and organic solvent are mixed, carry out the second solvothermal reaction, obtain zinc sulfide cadmium-ethylenediamine (abbreviated as Cd x Zn 1-x S(en) y )Precursor;

[0032] the Cd x Zn 1-x S(en) y The precursor is mixed with water for hydrothermal reaction to obtain porous two-dimensional zinc cadmium sulfide (abbreviated as Cd x Zn 1-x S, wherein, 0<x<1) nanosheets.

[0033] In the present invention, unless otherwise specified, all raw material components are commercially available products well known to those skilled in the art.

[0034] In the present invention, zinc salt, ethyl...

Embodiment 1

[0059] (1) Dissolve 2mmol of zinc acetate in 70mL of ethylenediamine aqueous solution (the volume ratio of ethylenediamine and water is 6:1). After the zinc acetate is completely dissolved, add 3mmol of thiourea and stir for 30min, and place the mixed system in water In a thermal reaction tank, react at 160°C for 16h, wash the obtained precursor with ethanol 5 times, and then dry at 60°C for 6h to obtain ZnS(en) 0.5 Precursor (white powder).

[0060] (2) Dissolve 160.6mg of cadmium chloride in 70mL of ethylene glycol to obtain a cadmium chloride solution, add 180mg of ZnS(en) 0.5 After the precursor was ultrasonically dispersed for 30 min, the resulting mixed solution was placed in a hydrothermal reaction tank and reacted at 160 °C for 8 h, the obtained precursor was washed with ethanol for 5 times, and then dried at 60 °C for 6 h to obtain Cd 0.5 Zn 0.5 S(en) y Precursor (yellow powder).

[0061] (3) 100mg Cd 0.5 Zn 0.5 S(en) y The precursor was mixed with 70 mL of dei...

Embodiment 2

[0065] (1) Dissolve 2mmol of zinc acetate in 70mL of ethylenediamine aqueous solution (the volume ratio of ethylenediamine and water is 6:1). After the zinc acetate is completely dissolved, add 3mmol of thiourea and stir for 30min, and place the mixed system in water In a thermal reaction tank, react at 160°C for 16h, wash the obtained precursor with ethanol 5 times, and then dry at 50°C for 8h to obtain ZnS(en) 0.5 Precursor (white powder).

[0066] (2) Dissolve 39.7mg of cadmium chloride in 70mL of ethylene glycol to obtain a cadmium chloride solution, add 100mg of ZnS(en) 0.5 The precursor was ultrasonically dispersed for 30 minutes and then stirred for 10 minutes. The resulting mixed solution was placed in a hydrothermal reaction tank and reacted at 160°C for 8 hours. The obtained precursor was washed 5 times with ethanol, and then dried at 50°C for 8 hours. get Cd 0.22 Zn 0.78 S(en) y Precursor (yellow powder).

[0067] (3) 100mg Cd 0.22 Zn 0.78 S(en) y The precur...

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Abstract

The invention provides a porous two-dimensional zinc cadmium sulfide nanosheet as well as a preparation method and an application thereof, and belongs to the technical field of nano photocatalysts. The preparation method of the porous two-dimensional zinc cadmium sulfide nanosheet comprises the following steps: mixing a zinc salt, an ethylenediamine aqueous solution and a sulfur source, and carrying out a first solvothermal reaction to obtain a zinc sulfide-ethylenediamine precursor; mixing the zinc sulfide-ethylenediamine precursor, a cadmium salt and an organic solvent, and carrying out a second solvothermal reaction to obtain a zinc cadmium sulfide-ethylenediamine precursor; and mixing the zinc cadmium sulfide-ethylenediamine precursor with water, and carrying out a hydrothermal reaction to obtain the porous two-dimensional zinc cadmium sulfide nanosheet. The porous two-dimensional zinc cadmium sulfide nanosheet prepared by the method is uniform in surface pore passage distribution,multiple in reaction active sites, stable in performance and excellent in catalytic effect on hydrogen production by photocatalytic decomposition of water.

Description

technical field [0001] The invention relates to the technical field of nanometer photocatalysts, in particular to a porous two-dimensional zinc cadmium sulfide nanosheet and its preparation method and application. Background technique [0002] Hydrogen energy is considered to be an ideal substitute for fossil fuels due to its high calorific value and environmental protection. As a green emerging technology, photocatalytic technology has potential application prospects in the field of light energy conversion. It can directly use solar energy to split water to produce hydrogen, and can convert solar energy that is difficult to use directly into chemical energy that can be directly used. An ideal way to produce hydrogen. At present, the development of efficient and stable photocatalysts is still the key to the practical hydrogen production from water splitting. Among many photocatalytic materials, CdS is a visible light-responsive photocatalyst, compared with other monomeric ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/04B01J35/10C01B3/04
CPCB01J27/04C01B3/042B01J35/39B01J35/33B01J35/60Y02E60/36
Inventor 刘恩周薛文华樊君胡晓云白雪苗慧张德恺
Owner NORTHWEST UNIV(CN)
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