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Method and device for photocatalytic degradation of organic pollutants in wastewater

A technology of organic pollutants and photocatalysis, applied in water pollutants, chemical instruments and methods, oxidized water/sewage treatment, etc., can solve the problems of difficult separation of photocatalysts, low catalytic efficiency and low reuse rate, etc. Achieve the effects of increasing the spectral response range, inhibiting the growth of grains, and enhancing the absorption capacity

Active Publication Date: 2020-06-09
NANCHANG HANGKONG UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] In order to solve the above problems, the object of the present invention is to provide a method and device for photocatalytic degradation of organic pollutants in wastewater, which are used to solve the problems of difficult separation of photocatalysts, low catalytic efficiency and activity, and low recycling rate

Method used

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  • Method and device for photocatalytic degradation of organic pollutants in wastewater
  • Method and device for photocatalytic degradation of organic pollutants in wastewater
  • Method and device for photocatalytic degradation of organic pollutants in wastewater

Examples

Experimental program
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Embodiment 1

[0046] A method for photocatalytically degrading organic pollutants in wastewater, comprising the following steps:

[0047] S1, preparation of titania sol

[0048] S1.1. Slowly drop 10mL of tetrabutyl titanate into 40mL of absolute ethanol, stir and mix well to obtain solution A;

[0049] S1.2. Weigh 6g of urea, add 10mL of ethanol, 8mL of deionized water and 2mL of nitric acid with a concentration of 65% respectively, and mix and stir evenly to obtain solution B;

[0050] S1.3. Slowly drop solution B into solution A, stirring continuously during the dropping process, and continue stirring for 6 hours after the dropping is completed, to obtain a titanium dioxide sol;

[0051] S2. Preparation of nano-zinc oxide electrospun membrane

[0052] Disperse the polymer material, acetic acid, europium nitrate, and zinc source in ethanol at a mass ratio of 1:0.2:0.04:0.2, and mix them uniformly to obtain the zinc source precursor sol; wherein, the mass of ethanol in the zinc source pre...

Embodiment 2

[0068] The device that adopts is identical with embodiment 1, and the difference with embodiment 1 is,

[0069] A method for photocatalytically degrading organic pollutants in wastewater, comprising the following steps:

[0070] S1, preparation of titania sol

[0071] S1.1. Slowly drop 10mL of tetrabutyl titanate into 40mL of absolute ethanol, stir and mix well to obtain solution A;

[0072] S1.2. Weigh and weigh 5g of urea, add 10mL of ethanol, 8mL of deionized water and 2mL of nitric acid with a concentration of 60% respectively, mix and stir to obtain solution B;

[0073] S1.3. Slowly drop solution B into solution A, stirring continuously during the dropping process, and continue stirring for 4 hours after the dropping is completed, to obtain a titanium dioxide sol;

[0074] S2. Preparation of nano-zinc oxide electrospun membrane

[0075] Disperse the polymer material, acetic acid, europium nitrate, and zinc source in ethanol at a mass ratio of 1:0.1:0.02:0.1, and mix th...

Embodiment 3

[0082] The device that adopts is identical with embodiment 1, and the difference with embodiment 1 is,

[0083] A method for photocatalytically degrading organic pollutants in wastewater, comprising the following steps:

[0084] S1, preparation of titania sol

[0085] S1.1. Slowly drop 10mL of tetrabutyl titanate into 40mL of absolute ethanol, stir and mix well to obtain solution A;

[0086] S1.2. Weigh 5.4g of urea, add 10mL of ethanol, 8mL of deionized water and 2mL of nitric acid with a concentration of 65% respectively, and mix and stir evenly to obtain solution B;

[0087]S1.3. Slowly drop solution B into solution A, stirring continuously during the dropping process, and continue stirring for 8 hours after the dropping is completed, to obtain a titanium dioxide sol;

[0088] S2. Preparation of nano-zinc oxide electrospun membrane

[0089] Disperse the polymer material, acetic acid, europium nitrate, and zinc source in ethanol at a mass ratio of 1:0.3:0.06:0.3, and mix ...

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Abstract

The invention provides a method and a device for photocatalytic degradation of organic pollutants in wastewater. The invention belongs to the technical field of organic pollutant treatment. The methodcomprises the steps: firstly, nitrogen element enters titanium dioxide crystal lattices in a manner of replacing nitrogen or interstitial nitrogen; the N-doped titanium dioxide sol is obtained; zincsource precursor sol is obtained in an electrostatic spinning mode, titanium dioxide grows on a spool of a nano zinc oxide electrospun film in order through a hydrothermal method, a zinc oxide / titanium dioxide composite film catalyst is obtained, the zinc oxide / titanium dioxide composite film catalyst and hydrogen peroxide have a synergistic effect, and the zinc oxide / titanium dioxide composite film catalyst has efficient catalytic capacity on various organic pollutants. The method is mild in reaction condition and high in degradation efficiency, and the degradation rate can reach 95% or aboveafter reaction is conducted for 2 h. According to the device, through a spirally coiled reaction tank body and a photocatalytic light source vertically inserted into the middle part of the reaction tank body, the problem that a photocatalyst is difficult to separate is effectively solved, and the service life of a catalyst film layer can be prolonged.

Description

technical field [0001] The invention relates to the technical field of organic pollutant treatment, in particular to a method and device for photocatalytically degrading organic pollutants in wastewater. Background technique [0002] There are many types of organic pollutants in wastewater, among which chemical wastewater, printing and dyeing wastewater, papermaking wastewater, and pharmaceutical wastewater have the most complex and toxic components. Once these organic pollutants are discharged directly, they will cause damage to the ecological environment. Therefore, how to effectively treat organic pollutants in wastewater to meet the standard of harmless discharge has become a major problem to be solved urgently. [0003] Since semiconductor catalysts such as titanium dioxide (TiO2) are easily excited by light, highly active photogenerated electrons (e - )-photogenerated holes (h+), thus forming strong oxidizing free radicals, such as hydroxyl radicals (OH), etc., which ...

Claims

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Application Information

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IPC IPC(8): C02F1/30C02F1/32C02F1/72B01J27/24B01J23/06B01J21/06C02F101/30
CPCC02F1/30C02F1/32C02F1/725C02F1/722B01J27/24B01J23/06B01J23/002B01J21/063C02F2305/10C02F2101/30B01J35/23B01J35/59B01J35/39
Inventor 吴美凤
Owner NANCHANG HANGKONG UNIVERSITY
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