Amidoxime-group pyridine chelating resin and preparation method thereof

A kind of amidoxime-based pyridine, chelating resin technology, applied in chemical instruments and methods, other chemical processes and other directions, can solve problems such as the reduction of adsorption capacity, and achieve the effects of low cost, simple operation, significant economic and environmental benefits

Active Publication Date: 2018-12-11
HAINAN NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the problems that the adsorption capacity of chelating resins in the prior art is significantly reduced in a high-acid and high-salt environment, the invention provides a kind of amidoxime-pyridine chelating resin and a preparation method thereof. The amidoxime-pyridine chelating resin can be used It is suitable for selective adsorption and separation of heavy met

Method used

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  • Amidoxime-group pyridine chelating resin and preparation method thereof
  • Amidoxime-group pyridine chelating resin and preparation method thereof
  • Amidoxime-group pyridine chelating resin and preparation method thereof

Examples

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Effect test

Embodiment 1

[0039] (a) suspension polymerization

[0040] Styrene monomer is filtered through a resin column equipped with a strong base anion exchange resin to remove the polymerization inhibitor;

[0041] In a 1000mL beaker, add 210g styrene, 20g divinylbenzene, and 140g polyvinylpyrrolidone (model PVPK30K-90, brand: BASF, Germany), stir well and set aside.

[0042]In a 1000mL three-neck flask, add 600mL of distilled water and heat up to 50°C, then add 8g of methylcellulose (M15), stir until completely dissolved, and at the same time raise the temperature to 60°C, add 2mL of methylene blue, stir well, add the above styrene , divinylbenzene and polypyrrolidone mixture, add initiator dicumyl peroxide 12.0g; adjust the appropriate stirring speed so that the size of the oil droplet is 0.5 ~ 1mm, gradually heat up to 75°C at a speed of 1°C / 5min, And keep it warm for 2 hours, gradually raise the temperature to 80°C for 2 hours at a rate of 1°C / 5min, gradually raise the temperature to 90°C fo...

Embodiment 2

[0053] Basically the same as embodiment 1, the difference is:

[0054] (a) suspension polymerization

[0055] Styrene is used as a monomer, divinylbenzene is used as a cross-linking agent, polyethylene glycol 4000 is used as a porogen, and hydroxypropyl methylcellulose (daily chemical grade, purchased from Netes Chemical) is used as a dispersant. Use dicumyl peroxide as initiator, adopt suspension polymerization method, synthesize macroporous polystyrene-divinylbenzene copolymer with low crosslinking degree, choose petroleum ether (boiling range 60-90 ℃) as solvent extraction, remove The remaining porogen in the resin channel is dried by airflow to obtain a low-crosslinked macroporous polystyrene-divinylbenzene resin, that is, white ball;

[0056] Wherein, the amount of crosslinking agent is 5% of the total amount of monomer and crosslinking agent, the amount of porogen is 50% of the weight of monomer, and the initiator accounts for 2.5% of the total amount of monomer, crossl...

Embodiment 3

[0066] Basically the same as embodiment 1, the difference is:

[0067] (a) suspension polymerization

[0068] Use styrene as a monomer, divinylbenzene as a crosslinking agent, use polyvinylpyrrolidone (model PVPK30K-90, brand: BASF, Germany) as a porogen, use magnesium hydroxide as a dispersant, and use dicumyl peroxide Using suspension polymerization as an initiator to synthesize macroporous polystyrene-divinylbenzene copolymer with low cross-linking degree, using ethanol as solvent for extraction to remove the residual porogen in the resin channels, and then air drying to obtain low cross-linking polystyrene-divinylbenzene copolymer. Liandaporous polystyrene-divinylbenzene resin, that is, white balls;

[0069] Wherein the amount of cross-linking agent is 5% of the total amount of monomer and cross-linking agent, the amount of porogen is 50% of the weight of monomer, and the initiator accounts for 4% of the total amount of monomer, cross-linking agent and porogen. The dosag...

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Abstract

The invention discloses an amidoxime-group pyridine chelating resin and a preparation method thereof. A structure unit of the amidoxime-group pyridine chelating resin is shown in the attached figure.The amidoxime-group pyridine chelating resin has the advantages that the preparation is simple, the cost is low, and the suitability to different heavy metal water bodies is strong; the oximido contains oxygen atoms and can be effectively bonded with the soft metal ions, the nitrogen atom of pyridine is difficult to protonize, and the pyridine can form feedback phi bond with the heavy metal ion, so that the removal ability on the heavy metal ions is still higher under the condition of higher acidity; the amidoxime-group pyridine chelating resin can be applied to the fields of removal of heavymetals in complicated water bodies, separation and pre-enrichment of interface heavy metals and soft metals in environment analysis, and the like; the economic benefits and environment benefits are obvious.

Description

technical field [0001] The invention relates to an amidoxime pyridine chelating resin and a preparation method thereof, belonging to the field of modified resins. Background technique [0002] Heavy metal pollution has become a major environmental problem that threatens human development, and heavy metal wastewater is the most serious environmental pollution and the most harmful industrial wastewater to humans. Heavy metals cannot be degraded by microorganisms into harmless substances, so they need to be effectively removed. [0003] Heavy metal ions in industrial wastewater usually coexist with inorganic salts and organic matter in an acidic environment. The presence of alkali (earth) metal ions and hydrogen ions will have a strong competitive effect on the adsorption sites and seriously weaken the removal efficiency of heavy metal ions. Conventional Ion exchange resins cannot effectively selectively remove and separate and recover heavy metal ions in such complex water bod...

Claims

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Application Information

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IPC IPC(8): C08F8/32C08F8/24C08F212/08C08F212/36C08F2/18B01J20/26
CPCB01J20/265C08F2/18C08F8/24C08F8/32C08F212/08C08F212/36
Inventor 张小朋史载锋王丽丽张大帅祁晓炜
Owner HAINAN NORMAL UNIV
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