Method for enhancing photodegradation of organic dyes in wastewater by acetaldehyde

A technology of organic dyes and photodegradation, applied in chemical instruments and methods, water pollutants, special compound water treatment, etc., can solve the problems of poor recycling performance and low photocatalytic efficiency, and achieve improved photocatalytic effect and improved decomposition Efficiency, good photosensitivity effects

Active Publication Date: 2020-01-24
ZHEJIANG OCEAN UNIV
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0006] The present invention aims to overcome the defects of low photocatalytic efficiency and poor recycling performance used in the method for photodegrading organic dyes in wastewater in the prior art, and provides a method for acetaldehyde-enhanced photodegradation of organic dyes in wastewater Method, which can rapidly degrade organic dyes in water under the condition of low ultraviolet light intensity and can be recycled

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  • Method for enhancing photodegradation of organic dyes in wastewater by acetaldehyde

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Embodiment 1

[0035] A method for acetaldehyde-enhanced photodegradation of organic dyes in wastewater, the method comprising the following steps:

[0036] (1) Micro-oxidation treatment: Add 0.042% hydrogen peroxide of the wastewater quality to wastewater containing 2300ppm of organic dye methylene blue, and stir for 45 minutes to obtain oxygenated wastewater;

[0037] (2) Preparation of pre-treatment liquid: After adding 800 ppm of acetaldehyde to oxygenated wastewater, the pre-treatment liquid is obtained;

[0038] (3) Ultraviolet photocatalysis: pass the pretreatment liquid into a container with a multilayer photocatalytic board, and then irradiate the container with a wavelength of 254nm and an irradiation intensity of 140uW / cm 2 20min of ultraviolet light to obtain degraded wastewater.

[0039] The preparation method of the photocatalytic board is as follows:

[0040] (S.1) Preparation of rare earth-containing aerogel: Add tetraethoxysilane and rare earth powder to five times the volume of tetra...

Embodiment 2

[0046] A method for acetaldehyde-enhanced photodegradation of organic dyes in wastewater, the method comprising the following steps:

[0047] (1) Micro-oxidation treatment: Add 0.001% hydrogen peroxide of the wastewater quality to wastewater containing 1600ppm organic dye Rhodamine B, and stir for 90min to obtain oxygenated wastewater;

[0048] (2) Preparation of pre-treatment liquid: After adding 300 ppm of acetaldehyde to oxygenated wastewater, the pre-treatment liquid is obtained;

[0049] (3) Ultraviolet photocatalysis: pass the pretreatment liquid into a container with a multilayer photocatalytic board, and then irradiate the container with a wavelength of 254nm and an irradiation intensity of 120uW / cm 2 10min of ultraviolet light to obtain degraded wastewater.

[0050] The preparation method of the photocatalytic board is as follows:

[0051] (S.1) Preparation of rare earth-containing aerogel: Add tetraethoxysilane and rare earth powder to five times the volume of tetraethoxysilan...

Embodiment 3

[0057] A method for acetaldehyde-enhanced photodegradation of organic dyes in wastewater, the method comprising the following steps:

[0058] (1) Micro-oxidation treatment: Add 0.05% hydrogen peroxide of the wastewater quality to wastewater containing 2300 ppm organic dye neutral red, and stir for 30 minutes to obtain oxygenated wastewater;

[0059] (2) Preparation of pre-treatment liquid: After adding 1500 ppm of acetaldehyde to oxygenated wastewater, the pre-treatment liquid is obtained;

[0060] (3) Ultraviolet photocatalysis: pass the pretreatment liquid into a container with a multilayer photocatalytic board, and then irradiate the container with a wavelength of 254nm and an irradiation intensity of 150uW / cm 2 The ultraviolet light is 30min, and the degraded wastewater is obtained.

[0061] The preparation method of the photocatalytic board is as follows:

[0062] (S.1) Preparation of rare earth-containing aerogel: Add tetraethoxysilane and rare earth powder to five times the volum...

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Abstract

The invention relates to the field of sewage treatment, and in particular relates to a method for enhancing photodegradation of organic dyes in wastewater by acetaldehyde. The method includes the following steps: adding a certain amount of hydrogen peroxide into the wastewater containing the organic dyes, and performing stirring for a certain period of time to obtain micro-oxidized wastewater; andadding a certain amount of an acetaldehyde solution into the micro-oxidized wastewater to obtain a pre-treatment solution, introducing the pre-treatment solution into a container, wherein the interior of the container is provided with multiple layers of photocatalytic plates, and irradiating the container with ultraviolet light for a certain period of time to obtain degraded wastewater, wherein the surfaces of the photocatalytic plates contain a certain amount of metal silver and rare earth elements. The method overcomes the defects of lower photocatalytic efficiency and poor recycling performance of a method for photodegrading organic dyes in wastewater used in the prior art, and has the advantage of rapidly degrading the organic dyes in the water under conditions of low ultraviolet light intensity; and meanwhile, the addition content of a photocatalytic accelerator is low, and the photocatalytic efficiency is not reduced with time.

Description

Technical field [0001] The invention relates to the field of sewage treatment, in particular to a method for enhancing photodegradation of organic dyes in wastewater by acetaldehyde. Background technique [0002] The wastewater produced by the textile industry is a common and important pollution problem worldwide, and attention should be paid to the treatment of such industrial wastewater. These industries produce a variety of waste water, including a large number of pollutants such as acidic substances, corrosive substances, toxic organic and inorganic substances, soluble solids, dyes and so on. Among textile wastewater, the biodegradation of reactive dye wastewater is the most difficult. [0003] Currently the world produces about 8×10 every year 5 t dyes, these dyes are widely used in food, textile, printing and dyeing, leather manufacturing and other industries. The dye lost in the entire dye production process accounts for 15% of the total dye output. Dye wastewater has the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/32C02F1/72C02F101/30
CPCC02F1/32C02F1/725C02F1/722C02F2101/308C02F2305/10
Inventor 徐焕志张保平高佳俊吴亦茹姚冰
Owner ZHEJIANG OCEAN UNIV
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