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CdS/g-C3N4 composite visible light catalyst, preparation method and application

A composite catalyst, g-c3n4 technology, applied in physical/chemical process catalysts, chemical instruments and methods, chemical/physical processes, etc., can solve the problem of poor stability of CdS catalysts, inability to achieve recycling, and reduced photocatalytic activity. problems, to achieve the effect of solving energy crisis, reducing the probability of photocorrosion and oxidation, and solving environmental problems

Inactive Publication Date: 2013-07-10
NANJING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The occurrence of photocorrosion phenomenon will lead to the deterioration of the stability of CdS catalyst and the reduction of photocatalytic activity, so that it cannot be recycled, which limits its practical application.

Method used

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  • CdS/g-C3N4 composite visible light catalyst, preparation method and application
  • CdS/g-C3N4 composite visible light catalyst, preparation method and application
  • CdS/g-C3N4 composite visible light catalyst, preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Example 1: CdS / g-C 3 N 4 =3:1 (mass ratio), g-C 3 N 4 Preparation and Application of Composite Visible Light Catalyst at Calcination Temperature of 520 °C

[0029] (1) Put melamine in a crucible and bake it in a muffle furnace at 500 °C for 2 h with a heating rate of 10 °C min -1 ; then heated up to 520 ℃, roasted for 2 h, cooled and ground to obtain g-C 3 N 4 ;

[0030] (2) Add 1 g g-C 3 N 4 Add to 1 mol L -1 In NaOH solution, ultrasonically make it form a uniformly dispersed suspension;

[0031] (3) Under constant stirring conditions, 0.1mol L -1 CdCl 2 Add the solution into (2), and keep stirring for 30 min; then add 0.1 mol L -1 Na 2 S solution and keep stirring for 30 min;

[0032] (4) The product obtained in (3) was centrifuged, washed with deionized water until neutral, dried in vacuum at 70 °C, cooled, ground and dried to obtain CdS / g-C 3 N 4 =3:1.

[0033] (5) Based on the obtained CdS / g-C 3 N 4 =3:1 is a photocatalyst, which catalyzes the...

Embodiment 2

[0043] Example 2: CdS / g-C 3 N 4 =3:1 (mass ratio), g-C 3 N 4 Preparation and Application of Composite Visible Light Catalyst at Calcination Temperature of 320 °C

[0044] In Example 2, the step (1) in Example 1 was changed to: put melamine in a crucible, bake it in a muffle furnace at 300 °C for 2 h, and the heating rate was 10 °C min -1 ; then heated up to 320 ℃, roasted for 2 h, cooled and ground to obtain g-C 3 N 4 . Other steps are as embodiment 1, obtain CdS / g-C 3 N 4 =3:1 composite visible light catalyst.

[0045] The CdS / g-C 3 N 4 =3:1 is used for visible light catalytic degradation MB solution, under the same reaction conditions as in Example 1, the degradation efficiency of MB after 3 h is 83.45% (see image 3 ).

Embodiment 3

[0046] Example 3: CdS / g-C 3 N 4 =3:1 (mass ratio), g-C 3 N 4 Preparation and Application of Composite Visible Light Catalyst at Calcination Temperature of 420 °C

[0047] In Example 3, the step (1) in Example 1 is changed to: put melamine in a crucible, bake it in a muffle furnace at 400 °C for 2 h, and the heating rate is 10 °C min -1 ; then heated up to 420 ℃, roasted for 2 h, cooled and ground to obtain g-C 3 N 4 . Other steps are as embodiment 1, obtain CdS / g-C 3 N 4 =3:1 composite visible light catalyst.

[0048] The CdS / g-C 3 N 4 =3:1 is used for visible light catalytic degradation MB solution, under the same reaction conditions as in Example 1, the degradation efficiency of MB after 3 h is 85.66% (see image 3 ).

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Abstract

The invention discloses a preparation method and application of a cadmium sulfide / graphite like carbon nitride (CdS / g-C3N4) composite visible light catalyst. The preparation method of the catalyst is a chemical precipitation method which is performed in an alkaline environment, wherein g-C3N4 is taken as a matrix, and CdCl2 and Na2S are taken as raw materials. The weight ratio of CdS to g-C3N4 in CdS / g-C3N4 is (1:2)-(5:1), and when the composite visible light catalyst is used for visible light catalysis treatment of methylene blue and methyl violet solutions, a better degradation effect can be obtained; and furthermore, the catalyst can still keep higher catalytic activity after being reused for five times. The composite visible light catalyst disclosed by the invention has important significance for development of the visible light catalyst, and also has good application prospects in treatment of dye wastewater.

Description

technical field [0001] The invention belongs to the field of visible light catalysis, in particular to a CdS / g-C prepared by a chemical precipitation method 3 N 4 Composite visible light catalyst and its application in catalytic degradation of pollutants in water under visible light. Background technique [0002] As a new type of environmental pollution control method, photocatalytic technology has many unique advantages, such as mild reaction conditions, easy operation, mineralization of most organic matter, less secondary pollution, and the use of sunlight. Most of the photocatalysts reported so far have wide band gaps and only show high catalytic activity in the ultraviolet region. But ultraviolet light only accounts for 5% of the total energy of sunlight, while visible light at 400-700 nm accounts for 43% of the total energy of sunlight. Therefore, in order to make better use of solar energy, the development of catalysts with visible light activity is an inevitable tr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/24C02F1/30C02F101/38
CPCY02W10/37
Inventor 陈欢闫婷婷江芳许晨敏
Owner NANJING UNIV OF SCI & TECH
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