Dye-salt separation membrane and preparation method thereof

A technology of separation membrane and dyeing salt, applied in the field of nanofiltration membrane, can solve the problems of secondary pollution, complicated preparation process of dyeing and salt separation membrane, loss of packing, etc., to improve water flux, excellent dyeing and salt separation effect, avoid The effect of secondary pollution

Inactive Publication Date: 2019-09-20
NANJING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the design and synthesis of new monomer molecules will complicate the preparation process of the dyed salt separation membrane, and the introduction of nano-fillers will cause the membrane to face filler loss during the filtration process, resulting in the risk of secondary pollution

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Step 1: preparing an aqueous phase solution whose solute is a mixture of tannic acid and anhydrous piperazine with a total mass fraction of 0.2 wt%. The mass ratio of tannic acid to anhydrous piperazine in the mixture is 1:2. After the aqueous phase solution is prepared, pour it on the surface of the polyethersulfone ultrafiltration membrane and completely soak it for 5 minutes, then drain the aqueous phase solution.

[0025] Step 2: preparing a n-hexane solution whose solute is trimesoyl chloride and whose mass fraction is 0.1 wt%. After the preparation is completed, pour it on the surface of the polyethersulfone ultrafiltration membrane treated in step 1 and soak it completely for 1 minute, then drain the organic phase solution. After the organic phase solution was completely volatilized, the prepared salt-stained separation membrane was stored in deionized water.

[0026] Separation performance test 1: Install the obtained salt-stained separation membrane into a me...

Embodiment 2

[0029] Step 1: preparing an aqueous phase solution whose solute is a mixture of tannic acid and anhydrous piperazine with a total mass fraction of 0.2 wt%. The mass ratio of tannic acid to anhydrous piperazine in the mixture is 2:1. After the aqueous phase solution is prepared, pour it on the surface of the polyethersulfone ultrafiltration membrane and completely soak it for 5 minutes, then drain the aqueous phase solution.

[0030] Step 2: preparing a n-hexane solution whose solute is trimesoyl chloride and whose mass fraction is 0.1 wt%. After the preparation is completed, pour it on the surface of the polyethersulfone ultrafiltration membrane treated in step 1 and soak it completely for 1 minute, then drain the organic phase solution. After the organic phase solution was completely volatilized, the prepared salt-stained separation membrane was stored in deionized water.

[0031] Separation performance test 1: Install the obtained salt-stained separation membrane into a me...

Embodiment 3

[0034] Step 1: preparing an aqueous phase solution whose solute is a mixture of tannic acid and anhydrous piperazine with a total mass fraction of 0.2 wt%. The mass ratio of tannic acid to anhydrous piperazine in the mixture is 1:1. After the aqueous phase solution is prepared, pour it on the surface of the polyethersulfone ultrafiltration membrane and completely soak it for 5 minutes, then drain the aqueous phase solution.

[0035] Step 2: preparing a n-hexane solution whose solute is trimesoyl chloride and whose mass fraction is 0.1 wt%. After the preparation is completed, pour it on the surface of the polyethersulfone ultrafiltration membrane treated in step 1 and soak it completely for 1 minute, then drain the organic phase solution. After the organic phase solution was completely volatilized, the prepared salt-stained separation membrane was stored in deionized water.

[0036] Separation performance test 1: Install the obtained salt-stained separation membrane into a me...

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Abstract

The invention discloses a dye-salt separation membrane and a preparation method thereof. The method comprises the following steps: firstly pouring an aqueous phase solution containing tannic acid and anhydrous piperazine with a mass ration of the tannic acid to the anhydrous piperazine of 1:2 to 2:1 onto the surface of a polysulfone ultrafiltration base membrane, after the surface is completely infiltrated, draining the aqueous phase solution, pouring an organic phase solution of trimesoyl chloride onto the surface of the base membrane, and draining the organic phase solution to obtain the dye-salt separation membrane. The method provided by the invention is simple and easy to implement, and the obtained dye-salt separation membrane has higher solution permeability, high-efficiency dye retention and inorganic salt penetration, has an excellent dye-salt separation effect, and a significantly-improved water flux under the conditions of higher dye retention and salt transmittance.

Description

technical field [0001] The invention belongs to the technical field of nanofiltration membranes, and relates to a dyed salt separation membrane and a preparation method thereof. Background technique [0002] Dye salt separation technology is a membrane water treatment technology, mainly for the treatment of salty dye wastewater. The nanofiltration membrane used in this technology is generally looser than the traditional nanofiltration membrane structure, which can effectively cut off organic matter with a molecular weight of 200-1000Da (such as organic dyes), while allowing inorganic salts (such as sodium sulfate, sodium chloride) to pass through the membrane. The pores can separate the dyes and salts in the wastewater, thereby recovering the salts and water (J. Membr. Sci. 2015, 477, 183–193). [0003] At present, the method of preparing dyed salt separation membrane is mainly the interfacial polymerization method. Interfacial polymerization is to dissolve two kinds of mo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D61/02B01D67/00B01D71/68C02F1/44C02F101/30
CPCB01D71/68B01D67/0002B01D61/027C02F1/442C02F2101/308B01D71/56B01D67/0006B01D2323/12B01D69/1251B01D61/145B01D2323/46
Inventor 李健生李秦齐俊文方小峰廖志鹏王大鹏谢佳倪临寒孙秀云王连军
Owner NANJING UNIV OF SCI & TECH
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