A three-dimensional flower-shaped zinc-sulfur-cadmium photocatalytic material and its preparation method and application

A photocatalytic material, flower-like body technology, applied in chemical instruments and methods, separation methods, carbon monoxide, etc., can solve the problems of carbon dioxide reduction, unreported photocatalytic system efficiency, and small specific surface area cavity structure, etc. Observable catalytic activity, abundant alkaline adsorption sites, and high light-harvesting efficiency

Active Publication Date: 2021-12-03
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

It should be pointed out that the Cd of these structures x Zn 1-x S solid solution has high-density characteristic morphology, small specific surface area cavity structure, and low light harvesting efficiency, which makes it unsatisfactory in prolonging the lifetime of photogenerated carriers and promoting the efficiency of photocatalytic systems.
In addition, regarding the three-dimensional Cd x Zn 1-x The study of direct photocatalytic reduction of carbon dioxide by S solid solution without any sacrificial agent has not been reported so far

Method used

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  • A three-dimensional flower-shaped zinc-sulfur-cadmium photocatalytic material and its preparation method and application
  • A three-dimensional flower-shaped zinc-sulfur-cadmium photocatalytic material and its preparation method and application
  • A three-dimensional flower-shaped zinc-sulfur-cadmium photocatalytic material and its preparation method and application

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Experimental program
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Effect test

Embodiment 1

[0028] A three-dimensional hierarchical flower-shaped body Cd 0.8 Zn 0.2 Preparation S light catalytic material, comprising the steps of:

[0029] Step 1 Sodium citrate 5mmol dissolved in 50mL of deionized water, uniformly stirred and mixed to obtain 0.1mol / L sodium citrate solution; cadmium chloride as a solute, water as a solvent to prepare 0.8mol / L cadmium chloride solution; zinc chloride as a solute, water as a solvent to prepare 0.2mol / L of zinc chloride solution; thiourea as a solute and water as a solvent to prepare 0.9mol / L thiourea solution;

[0030] Step 2, Step 1 was added a solution of sodium citrate prepared 10mL 10mL cadmium chloride and zinc chloride solution was stirred 20min uniformly mixed to obtain a mixture A;

[0031] Step 3, was added 5mL of concentrated aqueous ammonia (NH 2 in a mixture obtained in step A 3 · H 2 O, 28%) and 10mL of thiourea was stirred 20min uniformly mixed to obtain a mixture B;

[0032] Step 4, Step B 3 resulting mixture was stir...

Embodiment 2

[0034] Example Example 1 of the present embodiment as compared with the difference that: Step 1 formulating a concentration of cadmium chloride solution was 0.5mol / L, zinc chloride concentration of 0.5mol / L, to obtain a three-dimensional body is a flower-like hierarchical Cd 0.5 Zn 0.5 S, labeled C5Z5S.

Embodiment 3

[0036] Example Example 1 of the present embodiment as compared with the difference that: Step 1 formulating a concentration of cadmium chloride solution was 0.2mol / L, zinc chloride concentration of 0.8mol / L, to obtain a three-dimensional body is a flower-like hierarchical Cd 0.2 Zn 0.8 S, labeled C2Z8S.

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Abstract

A three-dimensional flower-shaped zinc-sulfur-cadmium photocatalytic material and its preparation method and application belong to the technical field of semiconductor photocatalytic materials. The zinc-sulfur-cadmium photocatalytic material is Cd x Zn 1‑x S, x=0.2-0.8, the shape is a three-dimensional hierarchical flower-like structure, the size of a single flower body is 2-3 μm, and the petal thickness is 2.5-3.5 nm. The zinc-sulfur-cadmium photocatalytic material of the present invention improves the photocatalytic activity from three aspects: first, the zinc-sulfur-cadmium with three-dimensional hierarchical flower-like structure has a larger specific surface area, which can provide a large number of photocatalytic reduction reaction active sites; secondly, the petals Thinner zinc-sulfur-cadmium has higher light-harvesting efficiency and can absorb and utilize more visible light; finally, the bandgap width of the three-dimensional hierarchical flower-like structure of zinc-sulfur-cadmium is about 2.4eV, and the conduction band position is lower than the reduction potential of carbon dioxide. More negative, it is beneficial to promote the migration of photogenerated electrons in the system, prolong the life of photogenerated carriers, and improve the photocatalytic activity of the system.

Description

Technical field [0001] The present invention belongs to the technical field of semiconductor photocatalytic material, and more particularly, to a light can be efficiently and selective catalytic reduction flower-shaped three-dimensional body zinc cadmium sulfur photocatalytic material and its preparation method and application of carbon dioxide. Background technique [0002] In recent years, the photocatalytic reduction of carbon dioxide is seen as a human can not only solve the problem of shortage of energy while reducing greenhouse gases, improving the new green technologies of the human environment. However, the construction of high catalytic activity and high stability of the catalytic system still faces enormous challenges. Due to the relative stability of the carbon dioxide gas, typically it requires significant catalyst activity to overcome recombination of photogenerated electron-hole pairs in the dynamics of the charge, maintaining excellent stability is also required. T...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J27/04B01J35/10B01D53/86B01D53/62C01G11/00C01B32/40
CPCB01D53/8671B01D2257/504B01J27/04B01J35/004B01J35/1004C01G11/006C01P2004/03C01P2004/04C01P2004/30C01B32/40
Inventor 向全军程蕾张怀武廖宇龙张岱南金立川李颉
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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