Zinc oxide/carbon composite photocatalyst and preparation method thereof

A photocatalyst and carbon composite technology, which is applied in the field of photocatalysis, can solve the problems of secondary pollution, difficulty in recycling and reusing granular photocatalysts, and achieve the effects of accelerating separation and transmission, improving photocatalytic efficiency, and increasing contact area

Inactive Publication Date: 2019-09-03
ZHEJIANG SCI-TECH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In addition, granular photocatalysts are difficult to recycle and reuse, and are likely to cause secondary pollution

Method used

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  • Zinc oxide/carbon composite photocatalyst and preparation method thereof
  • Zinc oxide/carbon composite photocatalyst and preparation method thereof
  • Zinc oxide/carbon composite photocatalyst and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] The preparation method of the zinc oxide / carbon composite photocatalyst of the present embodiment comprises the following steps:

[0035] Add 3.0 grams of zinc acetate, 1.2 grams of polyvinylpyrrolidone, and 1.2 grams of starch into 10 grams of deionized water, stir magnetically for 3 hours to completely dissolve the zinc acetate, polyvinylpyrrolidone, and starch, and then put the solution in a refrigerator at -20°C Freeze for 5 hours to obtain a composite material of zinc acetate, polyvinylpyrrolidone, starch and ice; immediately put the frozen composite material into a freeze dryer, and freeze-dry in a vacuum at a temperature of -60°C and a pressure of 3 Pa After 48 hours, obtain a porous composite material composed of zinc acetate, polyvinylpyrrolidone and starch, i.e. an intermediate product;

[0036] The obtained porous composite material was transferred to a clean ceramic ark, then placed in a tube furnace, heated at a rate of 2 °C / min in an air atmosphere to 270 ...

Embodiment 2

[0040] The preparation method of the zinc oxide / carbon composite photocatalyst of the present embodiment comprises the following steps:

[0041] Add 4.0 grams of zinc acetate, 1.2 grams of polyvinylpyrrolidone and 0.24 grams of starch into 10 grams of deionized water, stir for 3 hours to completely dissolve the zinc acetate, polyvinylpyrrolidone and starch, and then put the solution in the refrigerator at -80 °C Freeze for 3 hours at lower temperature to obtain zinc acetate, polyvinylpyrrolidone, starch and ice composite material; immediately put the frozen composite material into a freeze dryer, and freeze-dry it for 54 hours at -60 ° C under 10 Pa to obtain zinc acetate, polyvinylpyrrolidone, and polyvinylpyrrolidone. Composite porous material composed of vinylpyrrolidone and starch.

[0042] The obtained porous material was transferred to a clean ceramic ark, then placed in a tube furnace, heated at a rate of 0.5 °C / min in an air atmosphere to 200 °C for 4 hours, and then h...

Embodiment 3

[0046] The preparation method of the zinc oxide / carbon composite photocatalyst of the present embodiment comprises the following steps:

[0047] Add 0.5 g of zinc acetate, 0.4 g of polyvinylpyrrolidone, and 2.0 g of starch into 10 g of deionized water, stir magnetically for 3 hours to completely dissolve the zinc acetate, polyvinylpyrrolidone, and starch, and then put the solution in liquid nitrogen-196 Freeze at ℃ for 2 hours to obtain zinc acetate, polyvinylpyrrolidone, starch and ice composite material; immediately put the frozen composite material into a freeze dryer, and freeze-dry at -60 ℃ for 36 hours under 10 Pa to obtain zinc acetate, Composite porous material composed of polyvinylpyrrolidone and starch;

[0048] The obtained composite porous material was transferred to a clean ceramic ark, then placed in a tube furnace, heated at a rate of 10 °C / min to 300 °C for 1 hour in an air atmosphere, and then heated at 10 °C in a nitrogen atmosphere. The temperature was rais...

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Abstract

Belonging to the technical field of photocatalysis, the invention in particular relates to a zinc oxide / carbon composite photocatalyst and a preparation method thereof. The preparation method includesthe steps of: S1, adding zinc acetate, starch and polyvinylpyrrolidone into water, and performing stirring to obtain a mixed solution; S2, freezing the mixed solution and then conducting vacuum freeze drying to obtain an intermediate product; and S3, carrying out pre-oxidation treatment and carbonization treatment on the intermediate product in order to obtain the zinc oxide / carbon composite photocatalyst. According to the invention, zinc oxide is anchored on a porous carbon material, the high specific surface area, high porosity and good conductivity of a porous carbon material are utilizedto increase the contact area of a photocatalyst and dye, and accelerate the photoelectron-hole separation and transmission, thereby improving the photocatalytic efficiency; moreover, the photocatalystcan be simply extracted from an aqueous solution directly for recovery, and then can be used repeatedly. Moreover, in the carbonization process, carbon is doped with zinc oxide to expand the spectralresponse of zinc oxide and make zinc oxide absorb visible light.

Description

technical field [0001] The invention belongs to the technical field of photocatalysis, and in particular relates to a zinc oxide / carbon composite photocatalyst and a preparation method thereof. Background technique [0002] In recent years, a large amount of sewage containing organic pollutants has flowed into lakes and rivers, seriously threatening human health and the living environment. Therefore, wastewater treatment has become a global concern. As a potential water treatment technology, photocatalytic technology is attributed to its fast reaction speed and non-selectivity. [0003] The current photocatalysts mainly use semiconductor oxide nanoparticles, such as zinc oxide and titanium dioxide, etc., for which reference can be made to the patent documents published with publication numbers CN108014779A and CN106732817A. Such catalysts tend to absorb only ultraviolet light. Therefore, the development of photocatalysts with visible light response can effectively promote...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/06B01J35/10
CPCB01J23/06B01J35/60B01J35/39
Inventor 宋立新王天伟熊杰荆婉如
Owner ZHEJIANG SCI-TECH UNIV
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