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Magnetic microsphere resin for removing nitrate nitrogen selectively, and preparation method thereof

A technology of magnetic microspheres and nitrate nitrogen, which is applied in the direction of microsphere preparation, microcapsule preparation, chemical instruments and methods, etc., to achieve the effects of high alkali exchange capacity, good sedimentation performance, and good selective adsorption

Active Publication Date: 2012-05-02
NANJING UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Aiming at the lack of selectivity of existing magnetic resins for the adsorption of nitrate nitrogen, the present invention provides a magnetic microsphere resin for selectively removing nitrate nitrogen and a preparation method thereof, through which common raw materials and conventional operations can be used The method realizes the uniform distribution of magnetic particles in the resin skeleton, and obtains a magnetic propylene-based strong base anion exchange microsphere resin with strong magnetism and selective adsorption for nitrate nitrogen anions.

Method used

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  • Magnetic microsphere resin for removing nitrate nitrogen selectively, and preparation method thereof
  • Magnetic microsphere resin for removing nitrate nitrogen selectively, and preparation method thereof
  • Magnetic microsphere resin for removing nitrate nitrogen selectively, and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0036] Dissolve 15g of gelatin and 120g of sodium chloride in 500g of pure water to prepare an aqueous phase and add it to a three-necked flask. Add 98g capsules of 80g methyl acrylate, 20g acrylic acid, 10g ethylene glycol dimethacrylate, 0.5g benzoyl peroxide, 0.5g azobisisobutyronitrile, 80g toluene and 25g ethyl acetate Mix ferroferric oxide magnetic particles with a diameter of about 0.1 μm evenly, control the stirring speed at 100~150rpm, add it to the water phase, and raise the temperature to 55°C, keep it for 6 hours, raise the temperature to 85°C, keep it for 10 hours, and then discharge ; Wash with methanol and dry it, add N,N-diethylethylenediamine 3 times the mass of the resin, heat it at 150°C for 6 hours, and discharge it, wash it with methanol and pure water, add alkaline aqueous solution, and add 180g of ethyl bromide was discharged at 65°C for 18 hours, washed with methanol and pure water successively and transformed with sodium chloride solution to obtain a m...

Embodiment 2

[0040] Dissolve 2g of polyvinyl alcohol and 50g of sodium chloride in 500g of pure water to prepare an aqueous phase and add it to a three-necked flask. 90g methyl methacrylate, 10g methacrylic acid, 10g trimethylolpropane trimethacrylate, 1.0g azobisisobutyronitrile, 50g toluene, 10g 200 # Add 50g of ferroferric oxide magnetic particles with a particle size of about 0.1 micron to the mixed solution of solvent oil, mix evenly, control the stirring speed at 200~250 rpm, add it to the water phase, and raise the temperature to 50°C, keep it for 4 hours, then raise the temperature to 90°C, keep it for 4 hours, and discharge it; wash it with methanol and dry it, add N,N-diethylpropylenediamine 4 times the mass of the resin, keep it at 200°C for 12 hours, and discharge it; use methanol, pure After washing with water, add alkaline aqueous solution, and add 350g of bromopropane, heat it at 100°C for 12 hours, then discharge, wash with methanol and pure water in turn, and transform wit...

Embodiment 3

[0044] 4.5g of gull gum and 80g of sodium chloride were dissolved in 500g of pure water to prepare an aqueous phase and added to a three-necked flask. 80g ethyl acrylate, 5g acrylic acid, 5g ethylene glycol dimethacrylate, 5g triallyl cyanurate, 1.2g benzoyl peroxide, 1.5g azobisisobutyronitrile, 25g xylene, 25g of isobutanol mixture, add 16g of ferroferric oxide magnetic particles with a particle size of about 0.1 microns and mix evenly, control the stirring speed at 300~350 rpm, add it to the water phase, and raise the temperature to 60°C and keep it for 10 hours , heated up to 88°C, kept for 2 hours, and discharged; washed with ethanol and dried, added N,N-diethylpropylenediamine 5 times the mass of the resin, kept at 160°C for 8 hours, and discharged; 1. After washing with pure water, add alkaline aqueous solution, and add 500g bromobutane, heat it at 110°C for 20 hours, then discharge, wash with methanol and pure water in turn, and transform with sodium chloride solution ...

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Abstract

The invention discloses magnetic microsphere resin for removing nitrate nitrogen selectively, and a preparation method thereof, and belongs to the field of ion exchange resin. The resin consists of a resin skeleton, and magnetic granules wrapped in the resin skeleton; and the resin skeleton has a basic structural formula shown in the specification, wherein B is a quaternary ammonium salt group for adsorbing the nitrate nitrogen selectively, the saturation magnetization intensity of the quaternary ammonium salt group is between 5 and 30 emu / g, the exchange capacity of strong base is between 3.0 and 4.5 mmol / g, the exchange capacity of weak base is between 0.5 and 1.5 mmol / g, and the average grain diameter of the resin is between 50 and 500 micrometers. The resin is synthesized by a suspension polymerization method; acrylate monomers are mixed with a pore-forming agent and an initiator to form an oil phase; after being mixed with the magnetic granules uniformly, the mixture is subjectedto suspension polymerization with an aqueous phase mixed with a dispersing agent to form the magnetic polymer granules, and the magnetic polymer granules are subjected to aminolysis and alkylation toform the resin serving as a finished product. The resin can adsorb negative ions such as nitrates, nitrites and the like in a water body selectively, so the magnetic microsphere resin has a bright application prospect in fields of drinking water treatment, groundwater remediation and the advanced treatment of urban domestic sewage.

Description

technical field [0001] The invention discloses a resin for selectively removing nitrate nitrogen and its synthesis method, more specifically, it is an acrylic strong base anion exchange resin which is wrapped with magnetic particles and has a preferential adsorption and removal effect on nitrate nitrogen. and its preparation method. Background technique [0002] In recent years, the problem of nitrate nitrogen pollution in surface and groundwater sources has attracted worldwide attention. The waste discharged from human life and industrial and agricultural production has led to the continuous increase of the concentration of nitrate nitrogen in the environmental water body, posing a threat to human health. For traditional anion exchange resins, anions such as chloride ions and sulfate radicals that naturally exist in water and are non-toxic will be preferentially adsorbed by the resin over nitrate anions, reducing the use efficiency of the resin. A520E resin developed by B...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J41/14B01J13/02C02F1/42
Inventor 李爱民周扬宋海欧周庆张满成双陈冬
Owner NANJING UNIV
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