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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 low reuse rate, low catalytic efficiency and activity, and difficult separation of photocatalysts. To achieve the effect of enhancing the absorption capacity, inhibiting the growth of crystal grains, and increasing the spectral response range

Active Publication Date: 2022-07-22
NANCHANG HANGKONG UNIVERSITY
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  • 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 photocatalytic degradation of organic pollutants in wastewater, comprising the following steps:

[0047] S1. Preparation of Titanium Dioxide Sol

[0048] S1.1. Take 10 mL of tetrabutyl titanate and slowly drop it into 40 mL of anhydrous ethanol, fully stir and mix 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 to obtain solution B;

[0050] S1.3, slowly dropping solution B into solution A, stirring continuously during the dropping process, and continuing to stir for 6 h after the dropping to obtain titanium dioxide sol;

[0051] S2. Preparation of Nano-ZnO Electrospun Membranes

[0052] The polymer material, acetic acid, europium nitrate, and zinc source are dispersed in ethanol in a mass ratio of 1:0.2:0.04:0.2, and after mixing uniformly, a zinc source precursor sol is obtained; wherein, the mass of ethanol in the zinc s...

Embodiment 2

[0068] The adopted device is the same as that of Example 1, and the difference from Example 1 is that,

[0069] A method for photocatalytic degradation of organic pollutants in wastewater, comprising the following steps:

[0070] S1. Preparation of Titanium Dioxide Sol

[0071] S1.1. Take 10 mL of tetrabutyl titanate and slowly drop it into 40 mL of anhydrous ethanol, fully stir and mix to obtain solution A;

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

[0073] S1.3, slowly dropping solution B into solution A, stirring continuously during the dropping process, and continuing to stir for 4 h after the dropping to obtain titanium dioxide sol;

[0074] S2. Preparation of Nano-ZnO Electrospun Membranes

[0075] The polymer material, acetic acid, europium nitrate, and zinc source are dispersed in ethanol at a mass ratio of 1:0.1:0.02:0.1, and a...

Embodiment 3

[0082] The adopted device is the same as that of Example 1, and the difference from Example 1 is that,

[0083] A method for photocatalytic degradation of organic pollutants in wastewater, comprising the following steps:

[0084] S1. Preparation of Titanium Dioxide Sol

[0085] S1.1. Take 10 mL of tetrabutyl titanate and slowly drop it into 40 mL of anhydrous ethanol, fully stir and mix to obtain solution A;

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

[0087]S1.3, slowly dropping solution B into solution A, stirring continuously during the dropping process, and continuing to stir for 8 h after the dropping to obtain titanium dioxide sol;

[0088] S2. Preparation of Nano-ZnO Electrospun Membranes

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

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Abstract

The invention provides a method and a device for photocatalytic degradation of organic pollutants in wastewater, belonging to the technical field of organic pollutant treatment. The method firstly introduces nitrogen element into titanium dioxide crystal lattice in the form of replacing nitrogen or interstitial nitrogen to obtain doped N Then, electrospinning was used to obtain the zinc source precursor sol, and the titanium dioxide was grown on the spool of the nano-zinc oxide electrospinning film in an orderly manner by the hydrothermal method to obtain the zinc oxide / titanium dioxide composite thin film catalyst. Hydrogen peroxide has a synergistic effect and has efficient catalytic ability to a variety of organic pollutants. The method has mild reaction conditions and high degradation efficiency. After 2 hours of reaction, the degradation rate can reach more than 95%. The device effectively solves the problem of difficult separation of the photocatalyst through the spirally coiled reaction tank body and the photocatalytic light source vertically inserted in the middle of the reaction tank body, and can prolong the service life of the catalyst membrane layer.

Description

technical field [0001] The invention relates to the technical field of organic pollutant treatment, in particular to a method and a device for photocatalytic degradation of 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 are the most complex and toxic. Once these organic pollutants are directly discharged, 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+), which form strong oxidizing free radicals, such as hydroxyl radicals ( OH), etc., which have stron...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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 吴美凤陈歆晏小放刘虎
Owner NANCHANG HANGKONG UNIVERSITY
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