Acid-resistant composite nanofiltration membrane and preparation method thereof

A composite nanofiltration membrane and filtration membrane technology, applied in chemical instruments and methods, membrane, membrane technology, etc., can solve the problems of uncompared dynamic acidic salt solution separation performance, inapplicability, and the stability of composite membranes, etc., to achieve salt cut-off The effect of improving the rate or dye rejection rate, stabilizing membrane separation performance, and improving hydrophilicity

Inactive Publication Date: 2021-04-13
TIANJIN POLYTECHNIC UNIV +1
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, if the modified membrane prepared by this method is used in the field of acid salt or dye separation membrane, the stability of the composite membrane will be affected during use in different acid-base environments.
Patent CN 109999666 A uses interfacial polymerization to prepare high-throughput positively charged and acid-resistant nanofiltration membranes on the surface of polyethersulfone ultrafiltration membranes. The surface Zeta potential is 15-30mV, which is conducive to the separation of positively charged salt ions. Filter 2g / L MgCl after long immersion in hydrochloric acid solution of HCl 2 , the salt rejection rate was stable at 90%, but the separation performance of dynamic acidic salt solutions was not compared, and it was not suitable for the separation of negatively charged Na 2 SO 4 Isosaline solution

Method used

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  • Acid-resistant composite nanofiltration membrane and preparation method thereof
  • Acid-resistant composite nanofiltration membrane and preparation method thereof
  • Acid-resistant composite nanofiltration membrane and preparation method thereof

Examples

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Embodiment 1

[0020] Embodiment 1: Taking the self-made PVDF ultrafiltration membrane as an example,

[0021] (1) Carboxylation of the surface of PVDF membrane: first soak the self-made PVDF ultrafiltration membrane in methanol solution for 5 minutes, then immerse it in methanol solution with BP concentration of 0.4mol / L for 1.5 hours, take it out and let it dry naturally at room temperature ; prepare a monomer solution containing 0.3g acrylic acid, 0.05g ferrous amine sulfate, and 50mL deionized water, then pass nitrogen gas for 30min to remove oxygen, and finally put the monomer solution into a ziplock bag for preservation; put the PVDF ultrafiltration membrane into the above In a ziplock bag, transfer to a UV lamp (365nm, 8W) and irradiate at room temperature for 15min, and the obtained film is marked as PVDF / AA. After taking it out, wash it with a mixture of methanol and water to remove unreacted monomers, BP and a small amount of self-polymer, and store it in deionized water for future...

Embodiment 2

[0025] (1) PVDF film surface carboxylation modification: with embodiment 1 (1);

[0026] (2) Preparation of PVDF / CYS composite nanofiltration membrane:

[0027]First, soak the carboxylated PVDF membrane in a conical flask containing EDC-NHS buffer solution, put it into a shaker and fully react it at a speed of 100r / min for 24h, then take out and put in a cystamine flask with a content of 2.5wt%. Aqueous solution, then poured into n-hexane solution containing 0.25wt% 1,3-benzenedisulfonyl chloride, 1wt% ethylene glycol methyl ether and 1wt% triethylamine, the reaction time was 45s, and the membranes were respectively marked as PVDF / CYS; After taking it out, put it into an oven for heat treatment at 70°C for 15 minutes, then wash it with ethanol, and finally put the membrane into deionized water for storage.

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Abstract

The invention relates to an acid-resistant composite nanofiltration membrane and a preparation method thereof, and is characterized in comprising steps: taking vinyl polymers such as polytetrafluoroethylene and the like as a base membrane, and subjecting the surface of the membrane to carboxylation (-COOH) by an ultraviolet-induced graft polymerization method; then carrying out amidation reaction with water-based monomer polyamine; then carrying out interfacial polymerization reaction with an oil-phase monomer polysulfonyl chloride; and finally, forming the polysulfonyl chloride functional layer through thermocuring crosslinking. A new idea is provided for hydrophobic ultrafiltration membrane surface hydrophilic modification and acid salt solution or acid dye separation, the modified membrane has good hydrophilicity and acid resistance, high water flux and rejection rate can be kept in the nanofiltration separation process, and the modified membrane is expected to be used for seawater desalination or printing and dyeing wastewater treatment.

Description

technical field [0001] The invention relates to a modified polymer membrane material in the field of water treatment and a preparation method thereof, in particular to an acid-resistant composite nanofiltration membrane modified by an interface polymerization method and a preparation method thereof, and the method is used for acidic salt solution or acidic printing and dyeing wastewater The processing belongs to the field of separation membrane materials. Background technique [0002] Membrane separation technology has the advantages of remarkable separation effect, clean process, low energy consumption, and no secondary pollution. It is widely used in water treatment fields such as electronics, chemical industry, and medicine. Among them, nanofiltration is a new type of membrane technology between ultrafiltration and reverse osmosis, which can effectively intercept substances with a molecular weight between 200-1000Da, and is widely used in seawater desalination, printing a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D69/12B01D61/00B01D67/00B01D71/34C02F1/44
CPCB01D69/12B01D61/027B01D67/0006B01D71/34C02F1/442B01D2325/36B01D2325/30Y02A20/131
Inventor 付维贵翟高伟武家鑫孙美秀刘建超刘耀威陈熙赵义平陈莉
Owner TIANJIN POLYTECHNIC UNIV
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