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Preparation method of pyridine-functionalized sodium alginate adsorbent

A technology of sodium alginate and adsorbent, which is applied in the field of preparation of pyridine functionalized sodium alginate adsorbent, achieving the effect of low cost, broad application prospect and many adsorption sites

Active Publication Date: 2021-02-09
HAINAN NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In view of the fact that it is difficult for existing biomass adsorbents to simultaneously and effectively remove heavy metal ions and antibiotics of different sizes, and to solve the problem of cooperative adsorption and removal of heavy metal ions and antibiotics in a wide range of pH and salinity, the present invention provides a pyridine function Preparation method of sodium alginate adsorbent

Method used

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  • Preparation method of pyridine-functionalized sodium alginate adsorbent
  • Preparation method of pyridine-functionalized sodium alginate adsorbent
  • Preparation method of pyridine-functionalized sodium alginate adsorbent

Examples

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Embodiment 1

[0030]The preparation method of the pyridine functionalized sodium alginate adsorbent in this embodiment includes the following steps:

[0031]S1: In a 1000mL three-necked flask, add 0.5g polyethyleneimine (MW10000, 99%, Shanghai Minrel Chemical Technology Co., Ltd.), 2g sodium alginate (AR, Shanghai Minrel Chemical Technology Co., Ltd.), 500mL distilled water, Stir at a high speed with a mechanical stirrer for about 1h (speed 400r / min) in an oil bath at 20°C until the stirring is uniform, then cool to room temperature in the air to obtain a mixed mother liquor of sodium alginate and polyamine;

[0032]S2: Slowly add 1 mL of epichlorohydrin to the mixed mother liquor obtained in step S1 (the dropping rate is about 20 d / min), and stir at 300 r / min during the reaction, and carry out the delivery in an oil bath at 20°C. Linking reaction for 10 hours to obtain mixed cross-linking mother liquor;

[0033]S3: Drop the mixed crosslinking mother liquor obtained in S2 into 1000 mL of a coagulation bat...

Embodiment 2

[0038]The preparation method of the pyridine functionalized chitosan adsorbent in this embodiment includes the following steps:

[0039]S1: In a 1000mL three-necked flask, add 10g polyethyleneimine (MW10000, 99%, Shanghai Minrel Chemical Technology Co., Ltd.), 2g sodium alginate (AR, Shanghai Minrel Chemical Technology Co., Ltd.), and 500mL distilled water. Stir at a high speed with a mechanical stirrer at a 50°C oil bath for about 1 hour (speed of 400r / min) until the stirring is uniform, then cool to room temperature in the air to obtain a mixed mother liquor of sodium alginate and polyamine;

[0040]S2: Add 10 mL of epichlorohydrin slowly dropwise to the mixed mother liquor obtained in step S1 (the dropping rate is about 20 d / min), and stir at 300 r / min during the reaction, and carry out the delivery under an oil bath at 50°C. Linking reaction for 4h to obtain mixed crosslinking mother liquor;

[0041]S3: Add the mixed crosslinking mother liquor obtained in S2 dropwise to 1000mL coagulatio...

Embodiment 3

[0045]The preparation method of the pyridine functionalized sodium alginate adsorbent in this embodiment includes the following steps:

[0046]S1: In a 1000mL three-necked flask, add 20g polyethyleneimine (MW10000, 99%, Shanghai Minrel Chemical Technology Co., Ltd.), 10g sodium alginate (AR, Shanghai Minrel Chemical Technology Co., Ltd.), and 500mL distilled water. Stir at a high speed with a mechanical mixer at 80°C for about 1 hour (speed of 400r / min) in an oil bath until it is evenly stirred, then cool to room temperature in the air to obtain a mixed mother liquor of sodium alginate and polyamine;

[0047]S2: Add 25 mL of epichlorohydrin slowly dropwise to the mixed mother liquor obtained in step S1 (the dropping rate is about 20 d / min), and stir at 300 r / min during the reaction, and carry out delivery under 80°C oil bath The linking reaction is 8h to obtain the mixed crosslinking mother liquor;

[0048]S3: Add the mixed crosslinking mother liquor obtained in S2 dropwise to 1000 mL of a c...

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Abstract

The invention discloses a preparation method of a pyridine-functionalized sodium alginate adsorbent. The preparation method comprises the following steps: S1, preparing mixed mother liquor of sodium alginate and polyamine from polyethyleneimine and sodium alginate; S2, dropwise adding epoxy chloropropane into the mixed mother liquor obtained in the step S1, and carrying out a cross-linking reaction to obtain mixed cross-linked mother liquor; S3, dropwise adding the mixed cross-linked mother liquor obtained in the step S2 into a coagulating bath, and conducting precipitating and coagulating toobtain composite microspheres; S4, extracting the composite microspheres in the step S3 through a Soxhlet extractor; and S5, putting the microspheres obtained in the step S4, 2-chloromethylpyridine hydrochloride and sodium carbonate into an aqueous solution of ethanol, carrying out a stirring reaction in an oil bath, washing the obtained microspheres until the microspheres are neutral, and conducting dehydrating to obtain the pyridine-functionalized sodium alginate adsorbent. The adsorbent prepared by using the method has many nitrogen-containing functional group adsorption sites and a large pore size, and multiple nitrogen atoms on pyridyl and amido groups can play a role in coordination and chelation of heavy metals and exert hydrogen bonds, ion exchange and the like on antibiotics.

Description

Technical field[0001]The invention relates to a preparation method of a pyridine functionalized sodium alginate adsorbent, belonging to the field of modified adsorbent synthesis.Background technique[0002]Sodium alginate (SA) is a polysaccharide polymer containing amino and carboxyl groups, which can form a three-dimensional network hydrogel with metal ions such as calcium ions, and can be prepared into microspheres, and is widely used in the field of water treatment. There are some hydroxyl, carboxyl or amino groups on the molecular chain of sodium alginate, but its active functional group density is low and relatively single, and the intake of heavy metals and antibiotics is not high, and it cannot effectively remove heavy metals and antibiotics in complex water bodies. .[0003]Although there are related documents on the modification of sodium alginate adsorbent in the prior art, the prepared adsorbent has a small number of functional groups and a small pore size, which can only ads...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/22B01J20/28B01J20/30C02F1/28C02F101/20C02F101/30
CPCB01J20/22B01J20/28021C02F1/285C02F2101/20C02F2101/30
Inventor 张小朋史载锋孙诗书张花红张大帅
Owner HAINAN NORMAL UNIV
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