Preparation method, adsorbent and application of three-dimensional chitosan-metal ring complex

Abstract

The invention discloses a preparation method and an adsorbent of a three-dimensional chitosan-metal ring-shaped complex and application of the adsorbent. The preparation method comprises the following steps: (1) dissolving chitosan in an acetic acid water solution, adding metal sulfate, and continuing to stir till the solution is colloidal to finish cross-linking reaction; (2) dripping the colloidal solution into an ammonia-water solution, washing, and drying to obtain the three-dimensional chitosan-metal ring-shaped complex. From the perspective of the polymer material science, the invention provides a novel material structural form, particularly the chitosan-metal ring-shaped complex which is regular in form and compact in structure, and development of the new material form concept is facilitated. As chitosan has a very favorable economical application value per se, and the application field of chitosan is constantly widened, the metal ring-shaped complex of chitosan has a more industrialized application prospect. The prepared chitosan-metal ring-shaped complex is pure in material, simple and convenient to operate and low in economic cost, and can serve as a novel adsorbent to be applied to water treatment projects.

Description

technical field

[0001] The invention belongs to the technical field of adsorbent, and in particular relates to a preparation method, adsorbent and application of a three-dimensional chitosan-metal ring complex. Background technique

[0002] In recent years, more and more pollutants have caused a series of water pollution incidents through the discharge of urban garbage and industrial wastewater. The shortage of water resources and the pollution of water environment will definitely pose a huge, serious and potential threat to human life safety. . Therefore, people pay more and more attention to the governance of water environment. Compared with the traditional technology, the application of adsorption as a fluid separation technology in water treatment has attracted more and more attention, especially in the removal of toxic, harmful and refractory pollutants in water. The adsorption method has the advantages of less reagent consumption, The characteristics of low energy co...

Examples

Embodiment 1

[0036] Prepare 25 mL of glacial acetic acid solution with a volume fraction of 2%, slowly add 0.75 g of chitosan (molecular weight is 1 million, deacetylation degree is 91%), and continue stirring for 2 hours to fully dissolve chitosan, then slowly add 0.7102 g Na 2 SO 4And continue to stir, cross-linking reaction 4h. After fully reacting, use a 100mm inner diameter needle and a 1mL volume syringe to remove the chitosan sol dropwise and drop it into a petri dish containing 25% ammonia solution. and anhydrous ethanol were washed 3 times respectively, and dried in an oven at 50° C. for 2 hours to obtain a chitosan-metal ring complex with a compact structure.

Embodiment 2

[0038] Prepare 25 mL of glacial acetic acid solution with a volume fraction of 2%, slowly add 0.75 g of chitosan (molecular weight is 1 million, deacetylation degree is 91%), and continue stirring for 2 hours to fully dissolve chitosan, then slowly add 0.6665 g Fe 2 (SO 4 ) 3 And continue to stir, cross-linking reaction 4h. After fully reacting, use a 100mm inner diameter needle and a 1mL syringe to remove the chitosan sol drop by drop into a petri dish containing 28% ammonia solution. After the initial formation of the ring complex, pour off the ammonia solution and use water and anhydrous ethanol were washed 3 times respectively, and dried in an oven at 50° C. for 2 hours to obtain a chitosan-metal ring complex with a compact structure.

Embodiment 3

[0040] Prepare 25 mL of glacial acetic acid solution with a volume fraction of 2%, slowly add 0.75 g of chitosan (molecular weight is 1 million, deacetylation degree is 91%), and continue stirring for 2 hours to fully dissolve chitosan, then slowly add 1.3142 g NiSO 4 ·6H 2 O and continue to stir, cross-linking reaction 4h. After fully reacting, use a needle with an inner diameter of 100mm and a syringe with a capacity of 1mL to remove the chitosan sol drop by drop into a petri dish containing 27% ammonia solution. and anhydrous ethanol were washed 3 times respectively, and dried in an oven at 50° C. for 2 hours to obtain a chitosan-metal ring complex with a compact structure.

technical field

[0001] The invention belongs to the technical field of adsorbent, and in particular relates to a preparation method, adsorbent and application of a three-dimensional chitosan-metal ring complex. Background technique

[0002] In recent years, more and more pollutants have caused a series of water pollution incidents through the discharge of urban garbage and industrial wastewater. The shortage of water resources and the pollution of water environment will definitely pose a huge, serious and potential threat to human life safety. . Therefore, people pay more and more attention to the governance of water environment. Compared with the traditional technology, the application of adsorption as a fluid separation technology in water treatment has attracted more and more attention, especially in the removal of toxic, harmful and refractory pollutants in water. The adsorption method has the advantages of less reagent consumption, The characteristics of low energy co...

Examples

Embodiment 1

[0036] Prepare 25 mL of glacial acetic acid solution with a volume fraction of 2%, slowly add 0.75 g of chitosan (molecular weight is 1 million, deacetylation degree is 91%), and continue stirring for 2 hours to fully dissolve chitosan, then slowly add 0.7102 g Na 2 SO 4And continue to stir, cross-linking reaction 4h. After fully reacting, use a 100mm inner diameter needle and a 1mL volume syringe to remove the chitosan sol dropwise and drop it into a petri dish containing 25% ammonia solution. and anhydrous ethanol were washed 3 times respectively, and dried in an oven at 50° C. for 2 hours to obtain a chitosan-metal ring complex with a compact structure.

Embodiment 2

[0038] Prepare 25 mL of glacial acetic acid solution with a volume fraction of 2%, slowly add 0.75 g of chitosan (molecular weight is 1 million, deacetylation degree is 91%), and continue stirring for 2 hours to fully dissolve chitosan, then slowly add 0.6665 g Fe 2 (SO 4 ) 3 And continue to stir, cross-linking reaction 4h. After fully reacting, use a 100mm inner diameter needle and a 1mL syringe to remove the chitosan sol drop by drop into a petri dish containing 28% ammonia solution. After the initial formation of the ring complex, pour off the ammonia solution and use water and anhydrous ethanol were washed 3 times respectively, and dried in an oven at 50° C. for 2 hours to obtain a chitosan-metal ring complex with a compact structure.

Embodiment 3

[0040] Prepare 25 mL of glacial acetic acid solution with a volume fraction of 2%, slowly add 0.75 g of chitosan (molecular weight is 1 million, deacetylation degree is 91%), and continue stirring for 2 hours to fully dissolve chitosan, then slowly add 1.3142 g NiSO 4 ·6H 2 O and continue to stir, cross-linking reaction 4h. After fully reacting, use a needle with an inner diameter of 100mm and a syringe with a capacity of 1mL to remove the chitosan sol drop by drop into a petri dish containing 27% ammonia solution. and anhydrous ethanol were washed 3 times respectively, and dried in an oven at 50° C. for 2 hours to obtain a chitosan-metal ring complex with a compact structure.

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