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A kind of expanded graphite/zinc oxide composite photocatalyst and preparation method thereof

A technology of expanded graphite and zinc oxide, which is applied in the field of zinc oxide composite photocatalyst and its preparation, can solve the problems of complex process system, small particle size of zinc oxide, difficult precipitation and separation, and increased equipment investment, so as to achieve simple, safe and good preparation process. Application prospect, effect of preventing heavy accumulation

Inactive Publication Date: 2011-12-07
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method has a complex process system, and due to the increase of the thermal decomposition process, the equipment investment increases, the energy consumption increases, and the product cost increases.
[0004] The nano-zinc oxide photocatalytic reaction device includes a fluidized bed, a fixed plate, a circulation tower, and a membrane reactor, but the particle size of zinc oxide is small and difficult to precipitate and separate

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Add 0.1 g of expanded graphite to 100 mL of sodium hydroxide solution with a concentration of 1 mol / L, and stir at room temperature for 3 hours; configure 100 mL of zinc acetate solution with a concentration of 0.5 mol / L, slowly add it dropwise to the above solution, and heat at 60 °C Stir at low temperature for 2 hours; vacuum filter the mixed solution, and dry the filter residue at 60° C. to obtain an expanded graphite / zinc oxide composite photocatalyst (25% expanded graphite, 75% zinc oxide), and the particle size of the zinc oxide particle is 30nm. Afterwards, the composite photocatalyst was used to degrade methyl orange simulated wastewater under the irradiation of ultraviolet light, and the absorbance of methyl orange before and after degradation was measured by ultraviolet spectrophotometer, and the degradation rate of methyl orange was obtained as 58.12%.

Embodiment 2

[0023] Add 0.5 g of expanded graphite to 100 ml of sodium hydroxide solution with a concentration of 0.7 mol / L, and stir at room temperature for 0.5 hours; prepare 100 mL of zinc acetate solution with a concentration of 0.3 mol / L, and slowly add it dropwise to the above solution, at 50 Stir at ℃ for 3 hours; vacuum filter the mixed solution, and dry the filter residue at 70 ℃ to obtain an expanded graphite / zinc oxide composite photocatalyst (45% expanded graphite, 55% zinc oxide), and the particle size of the zinc oxide particle is 10nm. Afterwards, the composite photocatalyst was used to degrade methyl orange simulated wastewater under ultraviolet light irradiation, and the absorbance before and after methyl orange degradation was measured with an ultraviolet spectrophotometer, and the degradation rate of methyl orange was 78.93%.

Embodiment 3

[0025] Add 1.0 g of expanded graphite to 100 mL of sodium hydroxide solution with a concentration of 0.5 mol / L, and stir at room temperature for 0.5 hours; prepare 100 mL of zinc acetate solution with a concentration of 0.2 mol / L, slowly add it dropwise to the above solution, and Stir at ℃ for 4 hours; vacuum filter the mixed solution, and dry the filter residue at 80 ℃ to obtain an expanded graphite / zinc oxide composite photocatalyst (60% expanded graphite, 40% zinc oxide), and the particle size of the zinc oxide particle is 70nm. Afterwards, the composite photocatalyst was used to degrade methyl orange simulated wastewater under ultraviolet light irradiation, and the absorbance of methyl orange before and after degradation was measured with an ultraviolet spectrophotometer, and the degradation rate of methyl orange was obtained as 86.84%.

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Abstract

The invention relates to an expanded graphite zinc oxide composite photocatalyst and a preparation method thereof. The composite photocatalyst comprises: 10%-99% of expanded graphite and 1%-90% of zinc oxide by weight percentage. The preparation method comprises: (1) adding expanded graphite to sodium hydroxide solution at a mass volume ratio of 1-2 g: 100 ml, and stirring at room temperature for 0.5-3 hours to obtain a reaction liquid; : Add 0.1-5 zinc acetate solution into the above reaction solution, react at 50°C-90°C for 2-6 hours, vacuum filter the mixed solution, and dry the filter residue at 60°C-120°C. The invention not only avoids the agglomeration of its own particles, but also effectively prevents the reaccumulation of expanded graphite sheets; the raw materials of the preparation method are common and easy to obtain, the cost is low, and it has good application prospects.

Description

technical field [0001] The invention belongs to the field of zinc oxide composite photocatalyst and its preparation, in particular to an expanded graphite / zinc oxide composite photocatalyst and its preparation method. Background technique [0002] At present, the removal and degradation of pollutants by photocatalytic oxidation has become an active research direction in the field of environment. Compared with the physical methods in traditional water treatment technologies, photocatalytic oxidation technology has outstanding features such as high efficiency, low energy consumption, easy operation, mild reaction conditions, wide application range, and thorough degradation of pollutants. It is widely used in environmental governance. of favor. Compared with the commonly used titanium dioxide photocatalyst, zinc oxide can not only absorb ultraviolet light in sunlight, but also absorb a large amount of visible light, and the preparation process is simple. Therefore, zinc oxide...

Claims

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Application Information

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IPC IPC(8): B01J21/18B01J23/06
Inventor 李登新董金慧朱敏聪张迎晨金程张舒
Owner DONGHUA UNIV
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