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In-situ polymerization method modified anion exchange resin as well as preparation method and application thereof

A technology of exchange resin and in-situ polymerization, which is applied in the fields of chemistry and environment, can solve the problems of great influence of other ions and limited adsorption capacity, etc., and achieve the effect of improving adsorption capacity, increasing positive charge, and improving adsorption treatment effect

Inactive Publication Date: 2019-10-18
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Aiming at the problems that the existing anion exchange resins have limited adsorption capacity and are greatly affected by other ions, the present invention provides an anion exchange resin modified by in-situ polymerization and its preparation method and application

Method used

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  • In-situ polymerization method modified anion exchange resin as well as preparation method and application thereof
  • In-situ polymerization method modified anion exchange resin as well as preparation method and application thereof
  • In-situ polymerization method modified anion exchange resin as well as preparation method and application thereof

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Embodiment 1

[0040] The preparation method of in-situ polymerization modified anion exchange resin, the steps are as follows:

[0041] (1) Add 25.1 mL of dimethylamine aqueous solution into a three-necked flask with a stirring and condensing reflux device, and cool in an ice-water bath to reduce the temperature of dimethylamine to 8° C., and the mass concentration of dimethylamine aqueous solution is 40%;

[0042] (2) Weigh 1 g of the pretreated weakly basic anion exchange resin and place it in aqueous dimethylamine solution. With stirring, add 58.75 mL of epichlorohydrin dropwise with a constant pressure separating funnel to make the epichlorohydrin : The molar ratio of dimethylamine=1.5:1, control the dropping speed, the dropping time is controlled at 2h, strengthen cooling simultaneously, make the temperature in the reactor be controlled at 15 ℃;

[0043] (3) Continue to add 2.5 mL of ethylenediamine dropwise, so that n (ethylenediamine): n (epichlorohydrin + dimethylamine) = 3:100, the...

Embodiment 2

[0049] With the preparation method of the in-situ polymerization method modified anion exchange resin described in embodiment 1, difference is:

[0050] The amount of epichlorohydrin in step (2) is 19.58mL, and the molar ratio of epichlorohydrin: dimethylamine is 0.5:1.

[0051] Adsorb the Cr(VI) solution of 50mL, 100mg / L, add the weakly basic anion exchange resin modified in 0.03g embodiment 2, set the temperature of the constant temperature oscillation box to be 25°C, and the rotating speed is 150r / min. The removal rate of Cr(VI) is 80%, and the adsorption capacity is 137mg·g -1 .

Embodiment 3

[0053] With the preparation method of the in-situ polymerization method modified anion exchange resin described in embodiment 1, difference is:

[0054] The amount of epichlorohydrin in step (2) was 117.50 mL, and the molar ratio of epichlorohydrin: dimethylamine was 3:1.

[0055] Adsorb the Cr(VI) solution of 50mL, 100mg / L, add the weakly basic anion exchange resin modified in 0.03g embodiment 3, set the temperature of the constant temperature oscillation box to be 25°C, and the rotating speed is 150r / min. The removal rate of Cr(VI) is 86%, and the adsorption capacity is 147mg·g -1 .

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Abstract

The invention relates to an in-situ polymerization method modified anion exchange resin as well as a preparation method and application thereof. The modified anion exchange resin is prepared by usingan anion exchange resin with a tertiary amine group [-N(CH3)2] as an organic framework, epoxy chloropropane and dimethylamine as a modifier and ethylenediamine as a cross-linking agent through modification. According to the modified anion exchange resin provided by the invention, the content of amino is increased, weak alkali groups are also increased, the Zeta potential of the modified anion exchange resin is also remarkably increased, and in addition, the isoelectric point of the modified anion exchange resin is 6.62 which is far greater than that of an unmodified resin material, so that theadsorption treatment function on Cr(VI) is greatly improved, and the modified anion exchange resin has the advantages of being stable in quality, excellent in adsorption property, low in cost, simplein solid-liquid separation, large in mechanical strength, high in adsorption capacity, good in regeneration effect, free of secondary pollution, and the like.

Description

technical field [0001] The invention relates to an in-situ polymerization modified anion exchange resin and its preparation method and application, which belong to the technical fields of chemistry and environment. Background technique [0002] Chromium is considered to be one of the most toxic metals, and it mainly comes from wastewater produced by industries such as mining, metallurgy, electroplating industry, metal deep processing, steel manufacturing, tanning, dyestuff, textile industry, and chromate preparation. Chromium is a variable-valence element, and it mainly exists in two relatively stable valence states in natural water: Cr(III) and Cr(VI). Cr(VI) is soluble, usually in water as CrO 4 2- 、Cr 2 o 7 2- 、HCrO 4 - Anions with high mobility exist in the form of anions, which have strong oxidation and migration capabilities, and Cr(VI) can diffuse into cells through the cell membrane and oxidized biomolecules, which is more dangerous than Cr(III). The ecologic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J41/13C02F1/28C02F1/42C02F101/22
CPCB01J41/13C02F1/285C02F1/42C02F2001/422C02F2101/22
Inventor 高宝玉臧亚楠岳钦艳王宇
Owner SHANDONG UNIV
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