Oxalic acid and genipin cross-linked hydrogel filter membrane and application thereof in molecular ion separation under high salinity

A molecular ion and genipin technology, applied in membrane separation, filtration membrane, functional materials, high-salinity wastewater treatment, hydrogel field, can solve the problems of poor stability and mechanical strength

Active Publication Date: 2021-01-26
TIANJIN POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Zhao Kongyin and others have prepared a series of calcium alginate-based hydrogel filtration membranes. These calcium alginate-based filtration mem...

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] e) preparing an aqueous solution of a mixture of sodium alginate and 0.5% carboxymethyl chitosan at a mass percentage concentration of 1%, and standing for defoaming to obtain a casting solution;

[0018] f) preparing an aqueous solution of oxalic acid with a mass percent concentration of 1% as a crosslinking solution 1; preparing an aqueous solution of genipin with a mass percent concentration of 2% as a crosslinking solution 2;

[0019] g) Pour the casting solution obtained in step a) onto a dry and clean glass plate, scrape it flat with a glass rod with a diameter of 20 μm copper wires wound at both ends, and then immediately soak the glass plate and the scraped film into step b) The obtained cross-linking solution 1 was cross-linked for 5 minutes to obtain a preliminary cross-linked hydrogel film; the preliminary cross-linked hydrogel film was taken out, soaked in the cross-linking solution 2 obtained in step b) and cross-linked for 10 min. Fully wash the membrane w...

Embodiment 2

[0022] a) preparing an aqueous solution of a mixture of sodium alginate with a mass percentage concentration of 5% and 3.5% sericin, and standing for defoaming to obtain a casting solution;

[0023] b) preparing an aqueous solution of oxalic acid with a mass percentage concentration of 10% as crosslinking solution 1; preparing an aqueous solution of genipin with a mass percentage concentration of 0.01% as crosslinking solution 2;

[0024] c) Pour the film casting solution obtained in step a) onto a dry and clean glass plate, scrape it flat with a glass rod with a diameter of 1500 μm copper wire wound at both ends, and then immediately soak the glass plate and the scraped film into step b) The obtained cross-linking solution 1 was cross-linked for 600 min to obtain a preliminary cross-linked hydrogel film; the preliminary cross-linked hydrogel film was taken out, soaked in the cross-linking solution 2 obtained in step b) and cross-linked for 1800 min, and used to Fully wash the...

Embodiment 3

[0027] a) preparing an aqueous solution of a mixture of sodium alginate and 1% polyvinyl alcohol with a mass percentage concentration of 4%, and standing for defoaming to obtain a casting solution;

[0028] b) preparing an aqueous solution of oxalic acid with a mass percent concentration of 5% as a crosslinking solution 1; preparing an aqueous solution of genipin with a mass percent concentration of 1% as a crosslinking solution 2;

[0029]c) Pour the casting solution obtained in step a) onto a dry and clean glass plate, scrape it flat with a glass rod with a diameter of 100 μm copper wires wound at both ends, and then immediately soak the glass plate and the scraped film into step b) The obtained cross-linking solution 1 was cross-linked for 60 min to obtain a preliminary cross-linked hydrogel film; the preliminary cross-linked hydrogel film was taken out, soaked in the cross-linking solution 2 obtained in step b) for cross-linking for 60 min, and used to Fully wash the membr...

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PUM

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Abstract

A calcium alginate hydrogel film has good anti-pollution performance and molecular interception performance. However, the calcium alginate hydrogel is poor in stability and mechanical strength in a high-salinity aqueous solution. The invention discloses an oxalic acid and genipin cross-linked hydrogel filter membrane and application of the oxalic acid and genipin cross-linked hydrogel filter membrane in molecular ion separation under high salinity. The method comprises the following steps: preparing a mixture aqueous solution of sodium alginate and a polymer reinforcing agent as a membrane casting solution, scraping the membrane casting solution to form a membrane, and conducting crosslinking with oxalic acid and a genipin aqueous solution. Oxalic acid is simultaneously crosslinked with hydroxyl on the polymer reinforcing agent and hydroxyl on the alginate, and genipin is crosslinked with hydroxyl on the polymer reinforcing agent, amino and hydroxyl on the alginate. The obtained oxalicacid and genipin cross-linked hydrogel filter membrane can tolerate a high-concentration inorganic salt solution. The filter membrane has a low rejection rate on inorganic salt, has a high rejectionrate on body type molecules with the molecular weight of more than 650, and is particularly suitable for separation of molecular ions under high salinity.

Description

technical field [0001] The invention relates to a preparation method of a hydrogel filtration membrane crosslinked by oxalic acid and genipin, and belongs to the field of functional materials and membrane separation. [0002] The invention relates to the technical fields of filter membrane, hydrogel, high-salinity wastewater treatment and the like. Specifically relates to a preparation method of a hydrogel filtration membrane cross-linked by oxalic acid and genipin. Background technique [0003] In the past thirty years, earth-shaking changes have taken place in our country, and people's living standards have been greatly improved. However, development has brought about environmental problems, among which water pollution is the most serious. As a high-energy and water-consuming industry, the printing and dyeing industry has a relatively large amount of printing and dyeing wastewater, and the water requirement for each ton of textile products printed and dyed is 100-200 tons...

Claims

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Application Information

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IPC IPC(8): B01D67/00B01D71/06B01D71/76B01J13/00
CPCB01D71/76B01D71/06B01D67/0006B01J13/0065
Inventor 赵孔银谢文宾徐立静祖晨明李佳成李子逸刘海怡郝建颖翟海旭
Owner TIANJIN POLYTECHNIC UNIV
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