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A kind of photocatalytic self-cleaning loose nanofiltration membrane and its preparation method and application

A self-cleaning, nanofiltration membrane technology, applied in chemical instruments and methods, membranes, membrane technology, etc., can solve the problems of low dye wastewater treatment flux and low quantum efficiency, and achieve more water channels, high-efficiency separation, and extended The effect of service life

Active Publication Date: 2022-07-19
ZHENGZHOU UNIV
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  • 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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  • A kind of photocatalytic self-cleaning loose nanofiltration membrane and its preparation method and application
  • A kind of photocatalytic self-cleaning loose nanofiltration membrane and its preparation method and application
  • A kind of photocatalytic self-cleaning loose nanofiltration membrane and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

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

[0028] 1) Preparation of ultrathin nanosheets of Zn-TCPP: Weigh 16 mg of pyrazine, 90 mg of zinc nitrate, and 40 mg of polyvinylpyrrolidone (PVP) and dissolve them in 240 mL of mixed solution (DMF:ethanol is 3:1), which is recorded as mixed solution 1, Weigh 80mg of tetraphenylcarboxyporphine and dissolve it in 80ML (DMF:ethanol is 3:1) mixed solution, which is recorded as mixed solution 2. Mixed solution 2 is dropped dropwise into mixed solution 1, and then ultrasonicated for 10 minutes and reacted at 80 °C. After 24h, the solid was obtained after centrifugation at 12000r and washing with ethanol. The scanning electron microscope pictures 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 hundreds of nanometers;

[0029] 2) Dissolve melamine and Zn-TCPP ultra-thin nanosheets in the water pha...

Embodiment 2

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

Embodiment 3

[0034] In step 2), the mass concentration of Zn-TCPP in the aqueous phase was 0.02%, and the others were the same as in Example 1.

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Abstract

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. Melamine and Zn-TCPP nanosheets are dissolved in water to obtain an aqueous phase solution, the aqueous phase solution is suction filtered through a base membrane, and an oil phase solution is added, and a selective layer is formed on the base membrane after the reaction, and the obtained solution is obtained through thermal cross-linking reaction. The loose nanofiltration membrane. The nanofiltration membrane provided by the invention can realize high-efficiency and high-flux separation of dye wastewater, and can degrade the dye by a photocatalytic method to realize self-cleaning of the membrane and realize the continuous use of the membrane.

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] Dyestuff wastewater is a major source of industrial pollution in my country. Large amount of wastewater, deep chromaticity and poor biochemical degradation are typical characteristics of dye wastewater. Membrane technology has been used in wastewater treatment for a long time, but due to dye pollution treatment, the surface of the membrane will be fouled, the treatment capacity will be reduced, the treatment effect will be poor, the service life of the membrane will be reduced, and the energy consumption will be increased. The country has higher and higher requirements for wastewater discharge, but there is currently no membrane material specifically for this problem. Therefore, for dye-based wastewater, the hig...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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