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A kind of 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 effects of many adsorption sites, broad application prospects and low cost

Active Publication Date: 2021-11-19
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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  • A kind of preparation method of pyridine functionalized sodium alginate adsorbent
  • A kind of preparation method of pyridine functionalized sodium alginate adsorbent
  • A kind of preparation method of pyridine functionalized sodium alginate adsorbent

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Embodiment 1

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

[0031] S1: In a 1000mL three-neck flask, add 0.5g polyethyleneimine (M.W. 10000, 99%, Shanghai Merrill Chemical Technology Co., Ltd.), 2g sodium alginate (AR, Shanghai Merrill Chemical Technology Co., Ltd.), 500mL distilled water, Stir with a mechanical stirrer at high speed for about 1 h in an oil bath at 20°C (400r / min at a speed of 400r / min) until evenly stirred, then cool to room temperature in air to obtain a mixed mother liquor of sodium alginate and polyamine;

[0032] S2: Slowly add 1mL of epichlorohydrin to the mixed mother liquor obtained in step S1 (dropping speed is about 20d / min), stir at a speed of 300r / min during the reaction, and exchange in an oil bath at 20°C Linkage reaction 10h, obtain mixed crosslinking mother liquor;

[0033] S3: Add the mixed crosslinking mother liquor obtained in S2 dropwise into 1000mL coagulation bath...

Embodiment 2

[0038] The preparation method of pyridine functionalized sodium alginate adsorbent in this embodiment comprises the following steps:

[0039] S1: In a 1000mL three-neck flask, add 10g polyethyleneimine (M.W. 10000, 99%, Shanghai Merrill Chemical Technology Co., Ltd.), 2g sodium alginate (AR, Shanghai Merrill Chemical Technology Co., Ltd.), 500mL distilled water, in Stir at a high speed of about 1 h with a mechanical stirrer in an oil bath at 50°C (400r / min at a speed of 400r / min) until evenly stirred, then cool to room temperature in the air to obtain a mixed mother liquor of sodium alginate and polyamine;

[0040]S2: Slowly add 10mL of epichlorohydrin dropwise to the mixed mother liquor obtained in step S1 (dropping speed is about 20d / min), stir at a speed of 300r / min during the reaction, and exchange in an oil bath at 50°C Linkage reaction 4h, obtain mixed crosslinking mother liquor;

[0041] S3: Add the mixed cross-linking mother liquor obtained in S2 dropwise into 1000mL ...

Embodiment 3

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

[0046] S1: In a 1000mL three-necked flask, add 20g polyethyleneimine (M.W. 10000, 99%, Shanghai Merrill Chemical Technology Co., Ltd.), 10g sodium alginate (AR, Shanghai Merrill Chemical Technology Co., Ltd.), 500mL distilled water, In an oil bath at 80°C, use a mechanical stirrer to stir at high speed for about 1 h (rotation speed: 400r / min) until the stirring is uniform, and then cool to room temperature in the air to obtain a mixed mother liquor of sodium alginate and polyamine;

[0047] S2: Slowly add 25mL of epichlorohydrin dropwise to the mixed mother liquor obtained in step S1 (dropping speed is about 20d / min), stir at a speed of 300r / min during the reaction, and exchange in an oil bath at 80°C Linkage reaction 8h, obtain mixed crosslinking mother liquor;

[0048] S3: Add the mixed cross-linking mother liquor obtained in S2 dropwise int...

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Abstract

The invention discloses a preparation method of a pyridine functionalized sodium alginate adsorbent, comprising the following steps: S1: using polyethyleneimine and sodium alginate to prepare a mixed mother liquor of sodium alginate and polyamine; S2: mixing epoxy chloride Propane is added dropwise to the mixed mother liquor obtained in step S1, and a crosslinking reaction is carried out to obtain a mixed crosslinked mother liquor; S3: the mixed crosslinked mother liquor obtained in S2 is added dropwise to a coagulation bath, and composite microspheres are obtained by precipitation and solidification; S4: the composite microspheres in step S3 are extracted through a Soxhlet extractor; S5: the microspheres obtained in S4, 2-chloromethylpyridine hydrochloride and sodium carbonate are placed in an aqueous solution of ethanol, in The reaction was stirred in an oil bath, the obtained microspheres were washed until neutral, and dehydrated to obtain a pyridine functionalized sodium alginate adsorbent. The adsorbent prepared by the above method has more nitrogen-containing functional groups, more adsorption sites, and larger pore size. Multiple nitrogen atoms on the pyridyl and amine groups can coordinate and chelate heavy metals, and generate hydrogen bonds and ion exchanges for antibiotics. And so on.

Description

technical field [0001] The invention relates to a preparation method of a pyridine functionalized sodium alginate adsorbent, belonging to the field of synthesis of modified adsorbents. Background technique [0002] Sodium alginate (SA) is a polysaccharide polymer containing amino groups and carboxyl groups. It can form a three-dimensional network hydrogel with calcium ions and other metal ions, and can be prepared into microspheres. It is widely used in the field of water treatment. There are some hydroxyl groups, carboxyl groups or amino groups on the molecular chain of sodium alginate, but its active functional group density is low and relatively single, the uptake 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, due to the small number of functional groups and small pore size o...

Claims

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Application Information

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Patent Type & Authority Patents(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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