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Preparation method, regeneration method and application of chelating microfiltration membrane

A microfiltration membrane and chelation technology, applied in chemical instruments and methods, membranes, ultrafiltration, etc., can solve the problems of poor pollution resistance, cumbersome modification process, low pure water flux, etc., and achieve good salt resistance. , good hydrophilicity, simple and easy-to-obtain raw materials

Active Publication Date: 2017-05-10
NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention solves the technical problems that existing commercial microfiltration membranes are mostly limited to membrane bioreactors, and its modified products have cumbersome modification process, poor improvement effect, low pure water flux and poor pollution resistance in the treatment of heavy metal wastewater. It provides Preparation method, regeneration method and application of a chelating microfiltration membrane for capturing and enriching heavy metals with large flux and high capacity

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] (1) Preparation of PVDF flat film: First add 76g N,N-dimethylacetamide to the reactor, then add 9g polyethylene glycol with a molecular weight of 400 and 15g polyvinylidene fluoride PVDF, stir until completely dissolved to obtain Casting solution. Stir the casting solution in the reactor for 12 hours, control the temperature at 80°C, and then use the TIPS phase inversion method to form a film after standing for defoaming. After forming a membrane, immerse the membrane in distilled water for 1 hour and dry it to obtain Polyvinylidene fluoride PVDF flat film;

[0027] (2) Defluorination: Add the PVDF membrane prepared in step (1) into the reactor, add 1% alkaline potassium permanganate solution to the reactor, the mass ratio of the flat film to the solution is 1:20, and the temperature is controlled at 80°C, wash and dry after reacting for 4 hours;

[0028] (3) Grafting glycidyl methacrylate: the film that step (2) makes is added in the reactor, and adding concentration...

Embodiment 2

[0032] (1) Preparation of PVDF flat film: First add 80 g of triethyl phosphate into the reactor, then add 4 g of polyvinylpyrrolidone with a molecular weight of 8000 and 16 g of polyvinylidene fluoride PVDF, and stir until completely dissolved to obtain a casting solution. Stir the casting solution in the reactor for 44 hours, control the temperature at 100°C, and then use the TIPS phase inversion method to form a film after standing for defoaming. After forming a film, immerse the film in distilled water for 3 hours and dry it to obtain Polyvinylidene fluoride PVDF flat film;

[0033] (2) Defluorination: Add the PVDF membrane prepared in step (1) into the reactor, add 0.5% alkaline potassium permanganate solution to the reactor, the mass ratio of the flat film to the solution is 1:35, and the temperature is controlled at 10°C, wash and dry after reacting for 1 hour;

[0034] (3) Graft glycidyl methacrylate: add the film prepared in step (2) into the reactor, add a toluene so...

Embodiment 3

[0038] (1) Preparation of PVDF flat film: First add 70g of trimethylolpropane into the reactor, then add 22g of polyethylene glycol with a molecular weight of 500 and 8g of polyvinylidene fluoride PVDF, stir until completely dissolved to obtain a casting solution. Stir the casting solution in the reactor for 1 hour, control the temperature at 50°C, and then use the TIPS phase inversion method to form the film after standing for defoaming. After the film is formed, immerse the film in distilled water for 2 hours, and finally put the film After drying in the air, a flat sheet film of polyvinylidene fluoride PVDF is obtained;

[0039] (2) Defluorination: Add the PVDF membrane prepared in step (1) into the reactor, add 5.0% alkaline potassium permanganate solution to the reactor, the mass ratio of the flat film to the solution is 1:40, and the temperature is controlled at 75°C, wash and dry after reacting for 25 hours;

[0040] (3) Grafting glycidyl methacrylate: Add the film pre...

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PUM

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Abstract

The invention belongs to the field of heavy metal waste water treatment, and particularly relates to a preparation method, a regeneration method and application of a chelating microfiltration membrane. The invention is characterized in that a PVDF (polyvinylidene fluoride) casting membrane solution is prepared into a flat sheet membrane by a TIPS (thermally induced phase) method; then, the PVDF membrane is defluorinated by a basic potassium permanganate solution; then, GMA (glycidyl methacrylate) is used as a grafted monomer lengthened carbon chain; finally, melamine and the GMA are used for performing nucleophilic substitution reaction to prepare high-flux high-capacity heavy metal capturing and enriching chelating microfiltration membrane. The preparation process of the chelating microfiltration membrane is simple; the cost is low; the hydrophilia is good; the pollution-resistant performance is good; the excellent capturing performance of high speed, great capacity and the like are realized on heavy metal ions; the efficient purification treatment of heavy metal waste water can be realized; the methods provided by the invention are applicable to heavy metal involving industry waste water, are also applicable to integral wastewater biochemical tail water in industrial parks, polluted surface water, underground water and the like, and have a wide application range.

Description

technical field [0001] The invention belongs to the field of heavy metal wastewater treatment, and in particular relates to a preparation method, regeneration method and application of a chelating microfiltration membrane. Background technique [0002] With the acceleration of industrialization, a large amount of wastewater containing heavy metals (copper, nickel, lead, chromium, mercury, cadmium, etc.) is difficult to effectively treat, discharge or recycle up to the standard. Heavy metal pollutants are very harmful and cannot be biodegraded and metabolized, thereby causing serious harm to aquatic ecosystems, and after entering the water body, they are easy to pollute the sediment through deposition or physical and chemical reactions. Relevant water environment quality standards at home and abroad have put forward strict discharge limits for heavy metal pollutants. Conventional treatment methods for wastewater containing heavy metals mainly include coagulation sedimentatio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D67/00B01D61/14B01D71/34C02F1/44C02F101/20
CPCB01D61/147B01D67/0002B01D71/34C02F1/444C02F2101/20B01D67/00113B01D67/00931B01D67/0013C02F1/683B01D61/14B01D67/009B01D2323/18B01D2323/38B01D2323/21817B01D2323/21829B01D2323/2183B01D2323/2185B01D2323/2187
Inventor 刘福强张艳红宋丽赵伟朱长青凌晨李爱民
Owner NANJING UNIV
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