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Preparation method of cadmium sulfide-titanium oxide nanosheet composite photocatalyst

A titanium oxide, nanosheet technology, applied in physical/chemical process catalysts, chemical instruments and methods, chemical/physical processes, etc., can solve the problem of low quantization efficiency and limitation of photo-generated electron-hole high recombination rate titanium oxide photocatalysts. Titanium oxide photocatalyst has problems such as light energy utilization rate and unfavorable photo-generated electron transfer, so as to achieve the effect of improving atom utilization rate, ensuring photocatalytic activity and improving photocatalytic activity.

Inactive Publication Date: 2012-08-08
ZHEJIANG SCI-TECH UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, titanium oxide as a semiconductor photocatalyst has two fatal defects: on the one hand, the wide band gap makes titanium oxide photocatalyst only respond to ultraviolet light, and the ultraviolet part of sunlight accounts for less than 5% , so the utilization rate of solar energy by titanium oxide photocatalysts is low; on the other hand, the high recombination rate of photogenerated electrons and holes makes the quantization efficiency of titanium oxide photocatalysts low, which further limits the light energy utilization efficiency of titanium oxide photocatalysts.
The above method overcomes the shortcomings of the ion exchange method, but due to the surface modification of cadmium sulfide during the preparation process, there are organic substances between the cadmium sulfide and titanium oxide nanosheets in the obtained composite material, which is not conducive to the transfer of photogenerated electrons, resulting in photocatalytic low activity

Method used

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  • Preparation method of cadmium sulfide-titanium oxide nanosheet composite photocatalyst
  • Preparation method of cadmium sulfide-titanium oxide nanosheet composite photocatalyst
  • Preparation method of cadmium sulfide-titanium oxide nanosheet composite photocatalyst

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Experimental program
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Effect test

Embodiment 1

[0038] 1. Preparation of layered protonated titanate

[0039] 1) 3.22g of anhydrous potassium carbonate (commercially available), 0.55g of anhydrous lithium carbonate (commercially available), and 7.68g of titanium oxide (commercially available) were mixed and ground for 1 hour and then calcined at 1000°C for 20 hours to obtain 10g of alkali metal Layered titanate K 0.8 Ti 1.73 Li 0.27 o 4 ;

[0040] The alkali metal layered titanate is composed of negatively charged plates on the surface of titanyl octahedra and positively charged potassium ions between the layers, and lithium ions occupy the positions of some titanium atoms in the plate titanyl octahedrons;

[0041] 2) Weigh 2.3g of the above-mentioned alkali metal layered titanate K 0.8 Ti 1.73 Li 0.27 o 4 , impregnated in 200mL with a concentration of 1mol L -1 Hydrochloric acid aqueous solution and magnetic stirring, replace the hydrochloric acid aqueous solution every 24h, filter and wash after three days, and o...

Embodiment 2

[0049] Other implementation steps are the same as in Example 1, only the concentration of cadmium nitrate is changed, and the concentration of cadmium nitrate in the added cadmium nitrate aqueous solution is changed to 0.1mol / L to obtain a yellow cadmium sulfide-titanium oxide nanosheet composite photocatalyst.

[0050] The X-ray diffraction (XRD) pattern shows that the cadmium sulfide in the cadmium sulfide-titanium oxide nanosheet composite photocatalyst is a cubic phase; The morphology is a disordered stacking structure; the transmission electron microscope photos show that the size of the cadmium sulfide nanoparticles generated between the titanium oxide nanosheets is nanoscale, while the titanium oxide nanosheets still maintain their two-dimensional sheet structure; the ultraviolet-visible absorption spectrum It shows that after being sensitized by cadmium sulfide, the obtained cadmium sulfide-titanium oxide nanosheet composite photocatalyst has obvious spectral response i...

Embodiment 3

[0052] Other implementation steps are the same as in Example 1, only the concentration of cadmium nitrate is changed, and the concentration of cadmium nitrate in the added cadmium nitrate aqueous solution is changed to 0.3mol / L to obtain a yellow cadmium sulfide-titanium oxide nanosheet composite photocatalyst.

[0053]The X-ray diffraction (XRD) pattern shows that the cadmium sulfide in the cadmium sulfide-titanium oxide nanosheet composite photocatalyst is a cubic phase; The morphology is a disordered stacking structure; the transmission electron microscope photos show that the size of the cadmium sulfide nanoparticles generated between the titanium oxide nanosheets is nanoscale, while the titanium oxide nanosheets still maintain their two-dimensional sheet structure; the ultraviolet-visible absorption spectrum It shows that after being sensitized by cadmium sulfide, the obtained cadmium sulfide-titanium oxide nanosheet composite photocatalyst has obvious spectral response in...

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Abstract

The invention discloses a preparation method of a cadmium sulfide-titanium oxide nanosheet composite photocatalyst. The preparation method comprises the following steps: carrying out electrostatic self-assembly on titanium oxide nanosheets having negatively charged surfaces, and divalent cadmium ions to obtain a metal cadmium ion intercalated lamellar phase; and reacting the metal cadmium ion intercalated lamellar phase with thioacetamide to obtain the cadmium sulfide-titanium oxide nanosheet composite photocatalyst. The preparation method which allows cadmium sulfide to be intercalated into the titanium oxide nanosheets to extend the absorption spectrum to a visible light region makes a visible light response purpose be realized and the utilization rate of solar energy by the catalyst be improved. The preparation method of the invention has the advantages of simple preparation, environmental protection, low preparation cost and the like; and the prepared cadmium sulfide-titanium oxide nanosheet composite photocatalyst has the advantages of good stability, high catalytic activity and the like.

Description

technical field [0001] The invention relates to the field of photocatalyst preparation, in particular to a method for preparing a cadmium sulfide-titanium oxide nanosheet composite photocatalyst. Background technique [0002] With the development of society, energy issues and environmental issues have gradually become two major problems facing mankind in this century. Hydrogen production by photolysis of water and environmental remediation based on semiconductor photocatalysis technology are regarded as the most promising methods to solve the above two problems. Among numerous semiconductor photocatalytic materials, titanium oxide has been widely studied due to its low price, non-toxicity, easy handling, and good stability. However, titanium oxide as a semiconductor photocatalyst has two fatal defects: on the one hand, the wide band gap makes titanium oxide photocatalyst only respond to ultraviolet light, and the ultraviolet part of sunlight accounts for less than 5% , so ...

Claims

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Application Information

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IPC IPC(8): B01J27/04
Inventor 董晓平田燕龙傅杰常彬彬
Owner ZHEJIANG SCI-TECH UNIV
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