Preparation method of sodium alginate/L-cysteine/reduced graphene oxide magnetic hydrogel/aerogel

A cysteine, sodium alginate technology, applied in chemical instruments and methods, alkali metal oxides/hydroxides, inorganic chemistry, etc., can solve the problems of limited adsorption performance, inability to expand, waste of resources, etc. Reduced use and preparation time, enhanced adsorption and monitoring performance, improved surface porosity

Active Publication Date: 2018-03-06
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the preparation process requires the addition of a reducing agent, resulting in a waste of resources; at the same time, the surface pores and functional groups of the gel balls are less, resulting in limited adsorption performance; and the separatio

Method used

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  • Preparation method of sodium alginate/L-cysteine/reduced graphene oxide magnetic hydrogel/aerogel
  • Preparation method of sodium alginate/L-cysteine/reduced graphene oxide magnetic hydrogel/aerogel
  • Preparation method of sodium alginate/L-cysteine/reduced graphene oxide magnetic hydrogel/aerogel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] (1) Take a beaker, add 200mg of graphene oxide, 1000mg of sodium alginate, 200mg of L-cysteine, 200mg of nanometer iron ferric oxide, 200mg of sodium bicarbonate and 100mL of distilled water, and stir it by ultrasonic and mechanical for 2h to form a uniform mixture.

[0031] (2) Take another beaker and prepare 200mL of 10mg / mL CaCl at a temperature of 10°C 2 Solution, drop the mixed solution prepared in step (1) into CaCl with a peristaltic pump 2 In solution, unreduced gel spheres were obtained.

[0032] (3) After the unreduced gel balls prepared in step (2) were left to stand for 6 hours, they were placed in a water bath at 80° C. and heated for 3 hours to obtain reduced hydrogel balls. The obtained gel balls were soaked in distilled water for 6 h to remove surface impurities to obtain sodium alginate / L-cysteine / reduced graphene oxide magnetic hydrogel.

[0033] (4) Put the sodium alginate / L-cysteine / reduced graphene oxide magnetic hydrogel prepared in step (3) int...

Embodiment 2

[0038] (1) Take a beaker, add 1000mg graphene oxide, 7000mg sodium alginate, 2000mg L-cysteine, 2000mg nano ferric oxide, 2000mg sodium bicarbonate and 100mL distilled water, and stir it by ultrasonic and mechanical for 6h until a uniform solution.

[0039] (2) Take another beaker and prepare 200mL of 70mg / mL CaCl at 40°C 2 Solution, use a peristaltic pump to drop the mixed solution into CaCl 2 In solution, unreduced gel spheres were obtained.

[0040] (3) After the unreduced gel balls prepared in step (2) were left to stand for 12 hours, they were placed in a 90° C. water bath and heated for 12 hours to obtain reduced hydrogel balls. The obtained gel balls were soaked in distilled water for 12 hours to remove surface impurities to obtain sodium alginate / L-cysteine / reduced graphene oxide magnetic hydrogel.

[0041] (4) Put the prepared sodium alginate / L-cysteine / reduced graphene oxide magnetic hydrogel into a freeze dryer, and freeze it in a freezer at -40°C for 12 hours; the...

Embodiment 3

[0043] (1) Take a beaker, add 2000mg graphene oxide, 20000mg sodium alginate, 10000mg L-cysteine, 10000mg nano ferric oxide, 10000mg sodium bicarbonate and 100mL distilled water, and stir it by ultrasonic and mechanical for 10h to form homogeneous solution.

[0044] (2) Take another beaker and prepare 200mL of 200mg / mL CaCl at a temperature of 50°C 2 Solution, use a peristaltic pump to drop the mixed solution into CaCl 2 In solution, unreduced gel spheres are obtained.

[0045] (3) After the unreduced gel balls prepared in step (2) were left to stand for 24 hours, they were placed in a water bath at 100° C. and heated for 24 hours to obtain reduced hydrogel balls. The obtained gel balls were soaked in distilled water for 24 hours to remove surface impurities to obtain sodium alginate / L-cysteine / reduced graphene oxide magnetic hydrogel.

[0046] (4) Put the prepared sodium alginate / L-cysteine / reduced graphene oxide magnetic hydrogel into a freeze dryer, and freeze it in a fr...

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Abstract

The invention discloses a preparation method of sodium alginate/L-cysteine/reduced graphene oxide magnetic hydrogel/aerogel. The preparation method comprises the following steps: adding graphene oxide, sodium alginate, nano-iron oxide, L-cysteine and sodium bicarbonate into acidic, alkalic or neutral aqueous solution, performing ultrasonic treatment on the mixed solution and stirring the mixed solution until the mixed solution becomes uniform solution; contacting the mixed solution and divalent metal salt ion solution, so as to obtain unreduced aerogel; performing water-bath heating on the unreduced aerogel into aqueous solution, so as to obtain the sodium alginate/L-cysteine/reduced graphene oxide magnetic hydrogel; performing freeze drying on the magnetic hydrogel, so as to obtain the aerogel. The sodium alginate/L-cysteine/reduced graphene oxide magnetic hydrogel/aerogel prepared by the invention has porous and multi-networks structures and is larger in specific surface area and excellent in mechanical property, salt resistance, alkali resistance and adsorptive property, therefore, the hydrogel/aerogel is suitable for application in different fields; under the action of an external magnetic field, the material can be separated and recycled and has the application potential in more related fields.

Description

technical field [0001] The present invention aims at inventing a preparation method of sodium alginate / L-cysteine / reduced graphene oxide magnetic water / aerogel. Background technique [0002] As a natural polymer, sodium alginate passes CaCl 2 Gels prepared by solution crosslinking are widely used for dyes and heavy metals in water, and the loading of functionalized materials on sodium alginate microspheres and their application in adsorption has become a research hotspot, especially for nanomaterials and magnetic materials. [0003] L-cysteine ​​is a common amino acid in living organisms, which exists in many proteins and glutathione. It also has strong reducibility and weak acidity. When the reduction occurs, the sulfhydryl group of its side chain is opened, and a disulfide bond type cross-linking occurs. It can also interact with Ag + , Hg + , Cu + and other metal ions to form insoluble thiolates. [0004] Nanomaterials are popular materials in the field of adsorbents...

Claims

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Application Information

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IPC IPC(8): C08J3/075C08J3/24C08J9/28C08J9/08B01J20/28B01J20/24B01J20/22B01J20/20B01J20/30G01N33/00B03C1/01C08L5/04
CPCB01J20/20B01J20/22B01J20/24B01J20/28009B01J20/28047B03C1/01C08J3/075C08J3/24C08J9/0066C08J9/008C08J9/08C08J9/28C08J2201/0484C08J2203/02C08J2205/022C08J2205/026C08J2305/04G01N33/00
Inventor 马杰马垚陈君红
Owner TONGJI UNIV
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