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Magnetic high-strength high-toughness hydrogel for membrane pollution washing and application method thereof

A membrane fouling, high toughness technology, applied in functional materials and environmental fields, can solve the problems of insufficient removal of sponge balls, difficulty in recycling, and easy adsorption of pollutants by sponge balls.

Active Publication Date: 2018-11-02
TIANJIN POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] In view of the deficiencies in the prior art, the technical problems to be solved by the present invention are that the membrane fouling is difficult to physically clean, the sponge ball is not strong enough to remove the membrane surface pollution, the sponge ball is easy to absorb pollutants and is difficult to recycle, and the ordinary hydrogel has poor strength and stability. And other issues
[0011] The technical solution of the present invention to solve the problems of difficult physical cleaning of the membrane pollution, insufficient cleaning force of the sponge ball on the membrane surface pollution, easy adsorption of pollutants by the sponge ball and difficult recovery, and poor strength and stability of ordinary hydrogels is to design a membrane pollution Cleaning Magnetic Composite Hydrogels

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] a) Take by weighing 5g methacrylamide, 0.5g sodium alginate, sodium alginate mass percentage is 1% sodium silicate, methacrylamide mass percentage 0.03% ethylene glycol dimethacrylate, dissolve together in 50mL of deionized water, stir and dissolve evenly, then add magnetic pure iron powder with a mass percentage of 1% polymerized monomer, and obtain a prepolymer solution after ultrasonic dispersion;

[0025] b) preparing a metal ion mass percentage of 0.01% zinc chloride aqueous solution as an ion cross-linking agent;

[0026] c) configuring a mass percentage of 0.1% glucono-δ-lactone solution as an acid treatment solution;

[0027] d) in the prepolymer solution that step a) obtains, add the ammonium persulfate of methacrylamide mass percent 0.1%, the sodium bisulfite of methacrylamide mass percent 0.1%, the methacrylamide mass percent 0.1% Tetramethylethylenediamine, after stirring and dispersing evenly, extract the above-mentioned mixed solution with a syringe, in N...

Embodiment 2

[0032] a) Weigh 15g of acrylamide, 2g of sodium alginate, 60% of sodium alginate by mass percent sodium silicate, and 0.15% by mass of acrylamide of diisocyanate, dissolve them together in 100mL of deionized water, stir to dissolve evenly, and then add propylene Magnetite with amide mass percentage of 100%, obtained prepolymer solution after ultrasonic dispersion;

[0033] b) preparing an aqueous solution of calcium chloride with a mass percentage of metal ions of 10% as an ion cross-linking agent;

[0034] c) configuring a mass percentage of 6% glucono-δ-lactone solution as an acid treatment solution;

[0035] d) Adding 5% ammonium persulfate of acrylamide mass percentage to the prepolymer solution obtained in step a), 5% sodium bisulfite of acrylamide mass percentage, and 5% tetramethylethylenediamine of acrylamide mass percentage , after stirring and dispersing evenly, draw the above mixed solution with a syringe, 2 Inject into the ionic cross-linking agent obtained in st...

Embodiment 3

[0040] a) Weigh 10g of dimethylacrylamide, 1g of sodium alginate, the mass percentage of sodium alginate is 5% sodium silicate, and the N, N'-methylenebisacrylamide with a mass percentage of 0.1% of polymerized monomers are dissolved together In 80mL deionized water, stir and dissolve evenly, then add orthoferrate with a mass percentage of polymerized monomer of 20%, and obtain a prepolymer solution after ultrasonic dispersion;

[0041] b) preparing an aqueous solution of calcium hydrogen phosphate with a mass percentage of metal ions of 3.5%, as an ion cross-linking agent;

[0042] c) configuring a mass percentage of 2% glucono-δ-lactone solution as an acid treatment solution;

[0043] d) Add dimethylacrylamide mass percentage 1% ammonium persulfate to the prepolymer solution obtained in step a), dimethylacrylamide mass percentage 0.5% sodium bisulfite, dimethylacrylamide mass percentage 1% tetramethylethylenediamine, after stirring and dispersing evenly, extract the above m...

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Abstract

Magnetic high-strength high-toughness hydrogel for membrane pollution washing and an application method thereof are provided; sodium alginate is used as a framework; acrylamide and its derivatives areused as polymeric monomers; sodium silicate, the polymeric monomers and the sodium alginate are dissolved together in water; acrylamide polymerization is initiated by ultraviolet; calcium silicate nanoparticles are generated in situ in hydrogel by calcium ion crosslinking; calcium silicate having surface mesoporous silica gel is generated by soaking via glucono delta-lactone solution; the strength and stability of the hydrogel are improved accordingly. Nano calcium silicate evenly dispersed is generated by in-situ mineralization such that strength of the hydrogel is enhanced. Micro-nano magnetic particles are used as an enhancer to prepare microspheres via an injector; since the density of the micro-nano magnetic particles are very close to water in density and have high strength, high toughness and good stability, the hydrogel gains improved washing effect in jet or low washing process; the composite hydrogel with the silicate has significantly improved stability in water and has a good application prospect in the field of membrane pollution washing.

Description

technical field [0001] The invention relates to a magnetic high-strength and high-toughness hydrogel for cleaning membrane fouling and a using method, belonging to the field of functional materials and environment. Background technique [0002] Membrane separation technology has the functions of separation, concentration, purification and refining, as well as high efficiency, energy saving, environmental protection, molecular level filtration and simple filtration process, easy to control, etc. Therefore, membrane separation has become the most important means in today's separation science one. Membrane fouling refers to the adsorption and deposition of particles, colloidal particles or solute macromolecules in water on the surface of the membrane or in the pores of the membrane due to the physical and chemical interaction or mechanical interaction with the membrane during the membrane filtration process, resulting in the reduction of the membrane pore size or Clogging caus...

Claims

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Application Information

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IPC IPC(8): B01D65/02
CPCB01D65/02
Inventor 魏俊富齐梦张天烨王捷赵孔银赵磊李淑文马开心叶昀
Owner TIANJIN POLYTECHNIC UNIV
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