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Photocatalytic self-cleaning loose nanofiltration membrane and preparation method and application thereof

A self-cleaning, nanofiltration membrane technology, applied in chemical instruments and methods, membranes, membrane technologies, etc., can solve the problems of low flux and low quantum efficiency in dye wastewater treatment, and achieve increased sewage treatment capacity and photocatalytic quantum efficiency. High, long life effect

Active Publication Date: 2020-06-19
ZHENGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The goal of the present invention is to realize the advanced treatment of printing and dyeing wastewater, and the purpose is to provide a photocatalytic self-cleaning loose nanofiltration membrane and its preparation method. low efficiency

Method used

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  • Photocatalytic self-cleaning loose nanofiltration membrane and preparation method and application thereof
  • Photocatalytic self-cleaning loose nanofiltration membrane and preparation method and application thereof
  • Photocatalytic self-cleaning loose nanofiltration membrane and preparation method and application thereof

Examples

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Comparison scheme
Effect test

Embodiment 1

[0027] A photocatalytic self-cleaning loose nanofiltration membrane, the preparation process is as follows:

[0028] 1) Preparation of ultra-thin nanosheet Zn-TCPP: Weigh 16mg of pyrazine, 90mg of zinc nitrate, 40mg of polyvinylpyrrolidone (PVP) and dissolve in 240ML (DMF: ethanol 3:1) mixed solution, which is recorded as mixed solution 1, Weigh 80mg of tetraphenylcarboxyporphine and dissolve it in 80ML (DMF:ethanol: 3:1) mixed solution, which is recorded as mixed solution 2. Mixed solution 2 is dropped into mixed solution 1 drop by drop, then ultrasonicated for 10min, and reacted at 80°C After 24 hours, centrifuge at 12000 r and wash with ethanol to obtain a solid. The scanning electron micrographs of the obtained Zn-TCPP nanosheets are shown in figure 1 A, it can be found that Zn-TCPP is a nanosheet with a size of several hundred nanometers;

[0029] 2) Dissolve melamine and Zn-TCPP ultra-thin nanosheets in the water phase, dissolve TMC in n-hexane (oil phase), the mass co...

Embodiment 2

[0032] The mass concentration of Zn-TCPP in the water phase in step 2) is 0.01%, and the others are the same as in Example 1.

Embodiment 3

[0034] The mass concentration of Zn-TCPP in the water phase in step 2) is 0.02%, and the others are the same as in Example 1.

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Abstract

The invention belongs to the technical field of dye wastewater treatment, and particularly relates to a photocatalytic self-cleaning loose nanofiltration membrane and a preparation method and application thereof. The preparation method comprises the following steps: dissolving melamine and Zn-TCPP nanosheets in water to obtain a water phase solution, performing suction filtration on the water phase solution to obtain a base membrane, adding an oil phase solution, performing a reaction to form a selective layer on the base membrane, and performing a thermal cross-linking reaction to obtain theloose nanofiltration membrane. According to the nanofiltration membrane provided by the invention, high-efficiency and high-flux separation of dye wastewater can be realized, the dye can be degraded by utilizing a photocatalysis method to realize self-cleaning of the membrane, and continuous use of the membrane is realized.

Description

technical field [0001] The invention belongs to the technical field of dye wastewater treatment, and in particular relates to a photocatalytic self-cleaning loose nanofiltration membrane and a preparation method and application thereof. Background technique [0002] Dye wastewater is a large source of industrial pollution in my country. The typical characteristics of dye wastewater are large amount of wastewater, deep color, and poor biodegradability. Membrane technology has been used in wastewater treatment for a long time, but due to dye pollution treatment, membrane surface scaling will result in lower treatment capacity and poor treatment effect, which reduces the service life of the membrane and increases energy consumption. The country has higher and higher requirements for wastewater discharge, but currently there is no membrane material specifically for this problem. Therefore, for dye wastewater, the high flux and self-cleaning properties of the membrane are very i...

Claims

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Application Information

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IPC IPC(8): B01D71/56B01D67/00B01D65/02C02F9/04C02F101/30
CPCB01D71/56B01D67/0006B01D65/02C02F1/30C02F1/725C02F1/442B01D2325/10B01D2321/34C02F2101/308C02F2305/10C02F2303/16
Inventor 张亚涛徐梦影王景朱军勇张翔单美霞
Owner ZHENGZHOU UNIV
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