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Film surface hydrophilicity modifying method through PVA grafting by utilizing biological preparation

A biological agent, hydrophilic modification technology, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., can solve the problems of difficult cleaning, membrane flux attenuation, etc. Simple and effective in improving water flux

Inactive Publication Date: 2014-08-13
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since most of the membrane materials currently on the market are hydrophobic substances such as PDVF and PES, when treating oily wastewater or emulsion wastewater, the flux of the membrane is often attenuated and it is difficult to clean.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] (1) Preparation of polyvinyl alcohol and amino acid graft copolymer: Take 17.6g of polyvinyl alcohol (PVA) into the reactor, add dimethyl sulfoxide (DMSO), and heat to about 50°C under magnetic stirring Let it dissolve, let stand overnight, then add concentrated H 2 SO 4 Adjust the pH to 3, then add 43g of amino acid powder, react at 110°C for 16h, and finally get a red solution with white precipitates. Suction filter the above reactant under reduced pressure, pour the filtrate into 3L acetone solution, immediately a light yellow precipitate precipitates out, and filter again under reduced pressure to obtain a yellow solid, which is dissolved in DMSO under heating and stirring, and then filtered with suction , the mother liquor was poured into 1L of acetone, a solid was precipitated immediately, and filtered again to obtain a yellow solid.

[0032] (2) put 1m 3 (1m×1m) Soak the new film in isopropanol for 0.5 hours, take it out and immerse it in pure water for 12 hou...

Embodiment 2

[0036] (1) Preparation of polyvinyl alcohol and amino acid graft copolymer: Take 17.6g of polyvinyl alcohol (PVA) into the reactor, add dimethyl sulfoxide (DMSO), and heat to about 50°C under magnetic stirring Allow it to dissolve, let stand overnight, then add concentrated H 2 SO 4 Adjust the pH to 3, then add 43g of amino acid powder, react at 120°C for 8h, and finally get a red solution with white precipitates. Suction filter the above reactant under reduced pressure, pour the filtrate into 3L acetone solution, immediately a pale yellow precipitate precipitates out, filter again under reduced pressure to obtain a yellow solid, dissolve the solid in DMSO under heating and stirring, and filter with suction , the mother liquor was poured into 1L of acetone, a solid was precipitated immediately, and filtered again to obtain a yellow solid.

[0037] (2) Soak the tubular ceramic microfiltration membrane in isopropanol for 2 hours. Take it out and soak it in pure water for 24 h...

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Abstract

The invention relates to a film surface hydrophilicity modifying method through PVA grafting by utilizing a biological preparation. The method comprises the following steps: 1, immersing a film in isopropanol and pure water respectively to complete infiltrating treatment; 2, carrying out a contact reaction of the film filtrate surface and a dopamine solution, carrying out an aeration stirring reaction by utilizing air, cleaning through flushing by water, and immersing to obtain a film coated with polymerized dopamine; and 3, immersing the film coated with polymerized dopamine in a graft copolymer solution, carrying out a stirring reaction, cleaning by flushing, and carrying out seal packaging. The method is suitable for the surface modification of flat films, hollow fiber films and tubular films, and has the advantages of only film surface coating modification, no change of the structure of the film, simple operation, and easy industrialized production; the modified film has an especially-obvious effect in the treatment of oil-containing wastewater or emulsified wastewater; and the filtrate outlet water of the film is safe and reliable, and can reach reuse water quality requirements.

Description

technical field [0001] The invention belongs to the field of membrane material modification methods, in particular to a membrane surface hydrophilic modification method for PVA grafting using biological agents. Background technique [0002] As an efficient sewage treatment technology, membrane separation technology has the advantages of good treatment effect, stable effluent quality, simple equipment, small footprint and convenient operation. Hollow fiber membranes have gradually become microfiltration membranes due to their simple manufacturing process and low cost. Compared with the mainstream of ultrafiltration membranes, microfiltration / ultrafiltration hollow fiber membrane effluent can meet the current and future requirements for sewage discharge standards. At present, when waste water resources become a trend and sewage discharge standards are becoming more and more stringent, it is undoubtedly extremely strong. development potential and market prospects. [0003] At ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D71/78B01D69/04B01D69/06B01D69/08B01D67/00C02F1/44
Inventor 李方杨林明黄礼超朱云锋潘婷李勇汪帅
Owner DONGHUA UNIV
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