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Preparation method of SiO2/chitosan-based lead ion imprinted hollow microspheres

A lead ion and chitosan technology is applied in the field of preparation of SiO2/chitosan-based lead ion imprinted composite hollow microspheres, which can solve the problems of reduced adsorption capacity and loss of reactivity of chitosan, and achieves improved adsorption performance, The effect of high porosity and high porosity

Active Publication Date: 2019-12-03
晋江瑞碧科技有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Because some of the active amino groups and carboxyl groups on chitosan react with the cross-linking agent and lose their reactivity, the adsorption capacity of chitosan is greatly reduced.

Method used

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  • Preparation method of SiO2/chitosan-based lead ion imprinted hollow microspheres
  • Preparation method of SiO2/chitosan-based lead ion imprinted hollow microspheres
  • Preparation method of SiO2/chitosan-based lead ion imprinted hollow microspheres

Examples

Experimental program
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Effect test

Embodiment 1

[0037] (1) The preparation of the quenching liquid is as follows: add 1 g of polyurethane, 3 g of acetone, and 12 g of tetrahydrofuran into a 100 mL three-neck flask, stir magnetically at 50 ° C for 2 h, and dissolve to form a homogeneous solution. 0.02 g of nano-hydroxyapatite was added to the homogeneous solution, and magnetically stirred at room temperature to obtain a quenching solution. Put the quenching solution in a refrigerator pre-cooled to -20°C for 4 hours. After quenching, quickly take it out from the refrigerator, put it in a 500mL ice-water mixture, remove acetone and tetrahydrofuran, repeatedly change distilled water, wash, and freeze-dry to obtain polyurethane Microspheres.

[0038] (2) Add 10g of ethanol, 30g of distilled water, 1.2g of sodium silicate, 0.1g of polyethylene glycol, and 0.01g of hexadecyltrimethylammonium bromide into a three-necked flask, and magnetically stir to dissolve. After the dissolution, add 0.5 g polyurethane microspheres, magnetical...

Embodiment 2

[0042](1) The preparation of the quenching solution is as follows: add 1.5 g of polyurethane, 4 g of acetone, and 8 g of tetrahydrofuran into a 100 mL three-neck flask, and stir magnetically at 50 ° C for 2 h to form a homogeneous solution. Add 0.04 g of nano-hydroxyapatite to the homogeneous solution, stir and mix evenly at room temperature to obtain a quenching solution. Put the quenching solution in a refrigerator pre-cooled to -30°C and quench for 5 hours. After quenching, quickly take it out of the refrigerator, put it into 500mL ice-water mixture, remove acetone and tetrahydrofuran, repeatedly change distilled water, wash, and freeze-dry to obtain polyurethane Microspheres.

[0043] (2) Add 25g of ethanol, 30g of distilled water, 1.5g of sodium silicate, 0.1g of polyethylene glycol, and 0.01g of hexadecyltrimethylammonium bromide into a three-necked flask, stir and dissolve with magnetic force. After the dissolution, add 0.5 g polyurethane microspheres, magnetically sti...

Embodiment 3

[0047] (1) The preparation of the quenching solution is as follows: add 1.2 g of polyurethane, 5 g of acetone, and 7 g of tetrahydrofuran into a 100 mL three-neck flask, and stir magnetically at 50 ° C for 2 h to dissolve to form a homogeneous solution. 0.03 g of nano-hydroxyapatite was added to the homogeneous solution, and magnetically stirred at room temperature to obtain a quenching solution. Put the quenching solution in a refrigerator pre-cooled to -25°C and quench for 3 hours. After quenching, quickly take it out of the refrigerator, put it into 500mL ice-water mixture, remove acetone and tetrahydrofuran, repeatedly change distilled water, wash, and freeze-dry to obtain polyurethane Microspheres.

[0048] (2) Add 20g of ethanol, 30g of distilled water, 1.8g of sodium silicate, 0.1g of polyethylene glycol, and 0.01g of hexadecyltrimethylammonium bromide into a three-necked flask, stir and dissolve with magnetic force. After the dissolution, add 0.5 g polyurethane micros...

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Abstract

The invention discloses a preparation method of SiO2 / chitosan-based lead ion imprinted hollow microspheres. The method comprises the following steps: preparing polyurethane microspheres by using a thermally induced phase separation process; uniformly mixing ethanol, distilled water, sodium silicate, polyethylene glycol and a surfactant, and adding the polyurethane microspheres to form a mixed liquid; preparing SiO2 hollow microspheres by utilizing the mixed liquid; and dissolving chitosan into an acrylic acid aqueous solution, adding lead nitrate, performing uniform mixing, adding the SiO2 hollow microspheres and ammonium persulfate, and performing a series of reactions to obtain the SiO2 / chitosan-based lead ion imprinted hollow microspheres. The method provided by the invention has the following beneficial effects: the polymer microspheres are used as a template, orthosilicic acid is supported on the surface of the template, finally calcination is performed to obtain the SiO2 hollow microspheres, and the prepared SiO2 hollow microspheres have high porosity and a large specific surface area, and can be used as a carrier of loading of a catalyst, an adsorbent and a drug.

Description

technical field [0001] The present invention relates to a SiO 2 The invention relates to a preparation method of chitosan-based lead ion imprinted composite hollow microspheres, belonging to the technical field of adsorption materials. Background technique [0002] Chitosan is the only natural alkaline polysaccharide that exists in nature. It is obtained by deacetylation of chitin, and its molecule contains a large number of active amino and hydroxyl groups. The presence of these functional groups makes it easy for chitosan to combine with various metals to form metal-organic complexes, thereby achieving the purpose of removing heavy metal ions in water. At present, chitosan mainly exists in the form of powder, and the stability of chitosan in aqueous solution is relatively poor, so its application is limited. Based on the above reasons, researchers often load chitosan on some inorganic materials with large specific surface area and high porosity, and crosslink them with c...

Claims

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Application Information

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IPC IPC(8): B01J20/26B01J20/28C02F1/28B01J20/30C02F101/20
CPCB01J20/103B01J20/268B01J20/24B01J20/28021C02F1/286C02F1/285C02F1/281C02F2101/20
Inventor 刘瑞来刘丽敏齐小宝赵升云胡家朋林皓付兴平赵瑨云
Owner 晋江瑞碧科技有限公司
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