Method for preparing cadmium sulfide graphite-like carbon nitride compound photocatalyst

A graphite phase carbon nitride and photocatalyst technology, applied in the direction of physical/chemical process catalysts, chemical instruments and methods, chemical/physical processes, etc., can solve the problems of low photocatalytic efficiency, catalyst failure to achieve high-efficiency catalysis, and sunlight utilization Low rate and other issues

Inactive Publication Date: 2016-05-11
TIANJIN UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, photocatalysts generally have defects such as low utilization rate of sunlight and low photocatalytic efficiency.
This makes the catalyst unable to achieve the ability to catalyze efficiently

Method used

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  • Method for preparing cadmium sulfide graphite-like carbon nitride compound photocatalyst
  • Method for preparing cadmium sulfide graphite-like carbon nitride compound photocatalyst
  • Method for preparing cadmium sulfide graphite-like carbon nitride compound photocatalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] (1) Preparation of graphite-like phase carbon nitride g-C by polycondensation method 3 N 4 catalyst:

[0029] 1) Put about 15g of urea in a crucible with a lid, and dry at 80°C for 4h.

[0030] 2) Move the crucible to the muffle furnace, set the heating rate to 10°C min -1 , Calcined at 550°C for 3h.

[0031] 3) After the calcination is completed, wait for the muffle furnace to drop to room temperature, collect the light yellow product in the crucible and grind it into a bag to obtain g-C 3 N 4 Catalyst for later use.

[0032] (2) Preparation of CdS / g-C by hydrothermal method 3 N 4 (1:1) composite photocatalyst:

[0033] 1), take 0.1g of g-C prepared above 3 N 4 The catalyst was placed in a 100 mL round bottom flask containing 30 mL of deionized water and stirred in an electric heating mantle for 1 h to obtain a suspension.

[0034] 2) Dissolve 7mL of 0.1M cadmium nitrate solution and 7mL of 0.15M thioacetamide solution (molar ratio Cd:S=1:1.5) into the above...

Embodiment 2

[0041] (1) Preparation of graphite-like phase carbon nitride g-C by polycondensation method 3 N 4 Catalyst is identical with embodiment 1.

[0042] (2) Preparation of CdS / g-C by hydrothermal method 3 N 4 (1:2) composite photocatalyst

[0043] 1), take 0.1g of g-C prepared above 3 N 4 The catalyst was placed in a 100 mL round bottom flask containing 30 mL of deionized water and stirred in an electric heating mantle for 1 h to obtain a suspension.

[0044] 2) Dissolve 3.5mL of 0.1M cadmium nitrate solution and 3.5mL of 0.15M thioacetamide solution (molar ratio Cd:S=1:1.5) into the suspension.

[0045] 3) Control the above reaction temperature at 90° C. and magnetically stir for 5 hours.

[0046] 4), the reaction is completed, and the mixture is transferred to a centrifuge tube for centrifugation after the round-bottomed flask is cooled to room temperature.

[0047] 5), the obtained product is washed several times with ethanol and deionized water.

[0048] 6) Place the p...

Embodiment 3

[0051] (1) Preparation of graphite-like phase carbon nitride g-C by polycondensation method 3 N 4 Catalyst is identical with embodiment 1.

[0052] (2) Preparation of CdS / g-C by hydrothermal method 3 N 4 (1:5) composite photocatalyst

[0053] 1), take 0.1g of g-C prepared above 3 N 4 The catalyst was placed in a 100 mL round bottom flask containing 30 mL of deionized water and stirred in an electric heating mantle for 1 h to obtain a suspension.

[0054]2) Dissolve 1.4mL of 0.1M cadmium nitrate solution and 1.4mL of 0.15M thioacetamide solution (molar ratio Cd:S=1:1.5) into the suspension.

[0055] 3) Control the above reaction temperature at 90° C. and magnetically stir for 5 hours.

[0056] 4), the reaction is completed, and the mixture is transferred to a centrifuge tube for centrifugation after the round bottom flask is cooled to room temperature.

[0057] 5), the obtained product is washed several times with ethanol and deionized water.

[0058] 6) Place the prod...

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Abstract

The invention discloses a method for preparing a cadmium sulfide graphite-like carbon nitride compound photocatalyst. The photocatalyst is applied to the field of carbon dioxide reduction achieved through photocatalysis. Urea is placed in a quartz crucible drying box to be dried, and then a crucible is moved to a muffle furnace to be forged; after forging ends, the crucible is naturally cooled, and a g-C3N4 catalyst is obtained; the g-C3N4 catalyst is taken and placed in a round-bottom flask containing deionized water to be stirred to obtain suspension, and then a cadmium nitrate solution and a thioacetamide solution with the molar ratio being 1:1.5 are weighed and have a constant-temperature reaction in the suspension; after the reaction, the product is cooled to room temperature, centrifuged and washed with alcohol and deionized water for many times, the product is dried, ground and put into a bag, and the CdS/g-C3N4 compound photocatalyst is obtained. Raw materials used in the method are cheap and easy to obtain, operation is easy and convenient, activity evaluation is conducted on the prepared photocatalyst, results show that the photocatalyst can effectively reduce CO2, and the activity of the photocatalyst is greatly improved compared with a pure CdS catalyst and a pure g-C3N4 catalyst.

Description

technical field [0001] The invention relates to the preparation of a composite photocatalyst, which is used in the field of photocatalytic reduction of carbon dioxide. Background technique [0002] Due to the reduction in atmospheric CO 2 The content of carbon dioxide is of great significance to alleviate the worsening global climate problem and develop various raw material chemical industries. The conversion of carbon dioxide into useful substances has attracted great attention. However, CO 2 The chemical inertness is relatively large, which makes CO 2 conversion is very challenging. Photocatalysis is a cutting-edge research topic for converting solar energy into chemical energy. In the current study, using photocatalytic technology in different systems, CO 2 can be reduced to produce CH 3 OH, HCHO, HCOOH, CH 4 and other useful chemicals. photocatalytic reduction of CO 2 Catalysts play a vital role in catalysis, so finding catalysts with high catalytic activity and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/24
CPCB01J35/004B01J27/24
Inventor 尹晓红杨晓晓邵啸韩啸
Owner TIANJIN UNIVERSITY OF TECHNOLOGY
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