Preparation method of core-shell cobalt oxide/cobalt photocatalyst

A photocatalyst, cobalt oxide technology, applied in physical/chemical process catalysts, chemical instruments and methods, chemical/physical processes, etc., can solve problems such as single structure of cobalt oxide, achieve good catalytic effect, and promote catalytic effect.

Inactive Publication Date: 2017-07-28
CHANGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a method for preparing a core-shell type cobalt oxi

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0010] Example 1

[0011] Dissolve 4g cetyltrimethylammonium bromide in 20mL toluene, add 5g of cobalt oxide powder passed through a 100-mesh sieve, ultrasonically disperse for 100min, add 20mL of water, and add 1g of sodium borohydride at 600 rpm , Continue to stir for 8 min, precipitate and separate to obtain a core-shell cobalt oxide / cobalt photocatalyst.

[0012] The prepared core-shell cobalt oxide / cobalt photocatalyst is used to treat acid scarlet wastewater: the obtained core-shell cobalt oxide / cobalt photocatalyst is placed in 50 mL of acid scarlet wastewater with a concentration of 20 mg / L to be treated. Under the irradiation of a 300W metal halide lamp, the decolorization rate was 97.1% after reacting for 60 minutes.

Example Embodiment

[0013] Example 2

[0014] Dissolve 1g of cetyltrimethylammonium bromide in 20mL of toluene, add 4g of cobalt oxide powder passed through an 80-mesh sieve, ultrasonically disperse for 20min, add 5mL of water, and add 0.5g of borohydride at 400 rpm Sodium, continue to stir for 4 minutes, precipitate and separate, and obtain a core-shell type cobalt oxide / cobalt photocatalyst.

[0015] The prepared core-shell type cobalt oxide / cobalt photocatalyst is used to treat methylene blue-containing wastewater: the obtained core-shell type cobalt oxide / cobalt photocatalyst is placed in 50mL wastewater containing methylene blue with a concentration of 20mg / L, and the temperature is 300W. Under the irradiation of the metal halide lamp, the decolorization rate was 94.7% after reacting for 60 minutes.

Example Embodiment

[0016] Example 3

[0017] Dissolve 3g of cetyltrimethylammonium bromide in 20mL of toluene, add 5g of cobalt oxide powder passed through an 80-mesh sieve, ultrasonically disperse for 80min, add 10mL of water, and add 0.8g of borohydride at a rotation speed of 600 rpm Sodium, continue to stir for 8 minutes, precipitate and separate to obtain a core-shell type cobalt oxide / cobalt photocatalyst.

[0018] The prepared core-shell type cobalt oxide / cobalt photocatalyst is used to treat rhodamine B-containing wastewater: the obtained core-shell type cobalt oxide / cobalt photocatalyst is placed in 50 mL of 20mg / L rhodamine B-containing wastewater to be treated Under the irradiation of a 300W metal halide lamp, the decolorization rate was 96.4% for 60 minutes.

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Abstract

The invention discloses a preparation method of a core-shell cobalt oxide/cobalt photocatalyst. The preparation method includes following steps: dissolving 1-4g of cetyl trimethyl ammonium bromide into 20mL of methylbenzene; adding 4-5g of cobalt oxide powder after going through a sieve with 80-100 meshes, and ultrasonically dispersing for 20-100min; adding 5-20mL of water, adding 0.5-1g of sodium borohydride at a rotating speed of 400-600rpm, and continuing stirring for 4-8min; precipitating and separating to obtain the core-shell cobalt oxide/cobalt photocatalyst. Cobalt oxide serves as both a precursor for preparing elemental cobalt and a carrier to provide an active site function supporting nucleation and growth of nanoparticles and a surfactant to control growth of the nanoparticles as a template function; a reducing agent is added into a mixture containing supporting-template double-function microreaction environment, and a part on the surface of the mixture is reduced to obtain a core-shell catalyst with cobalt oxide as a core and cobalt on the surface; cobalt oxide and cobalt are synergistic, thereby being capable of better promoting catalytic effect.

Description

technical field [0001] The invention relates to the development of new materials for environmental pollution control, in particular to a method for preparing a core-shell type cobalt oxide / cobalt photocatalyst. Background technique [0002] Industrial wastewater such as domestic sewage, food processing, and papermaking contains organic substances such as carbohydrates, proteins, oils, and lignin. These substances exist in the sewage in a suspended or dissolved state and can be decomposed by the biochemical action of microorganisms. Oxygen-depleting pollutants are called oxygen-depleting pollutants because they consume oxygen during their decomposition. This pollutant can reduce dissolved oxygen in the water, affecting the growth of fish and other aquatic organisms. After the dissolved oxygen in the water is exhausted, the organic matter undergoes anaerobic decomposition, producing unpleasant odors such as hydrogen sulfide, ammonia and mercaptans, which deteriorate the wate...

Claims

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Application Information

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IPC IPC(8): B01J23/75B01J35/02C02F1/30C02F101/34C02F101/36C02F101/38
CPCB01J23/75B01J35/004B01J35/02C02F1/30C02F2101/34C02F2101/36C02F2101/38C02F2101/40C02F2305/10
Inventor 倪清卓马建锋
Owner CHANGZHOU UNIV
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