Unlock instant, AI-driven research and patent intelligence for your innovation.

Graphite oxide/magnetic chitosan composite adsorbent and preparation method thereof

A composite adsorption and chitosan technology, applied in chemical instruments and methods, and other chemical processes, to achieve process parameter control, high adsorption capacity, and good reusability

Inactive Publication Date: 2012-03-21
WUHAN UNIV
View PDF2 Cites 13 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, chitosan has low density, soft quality, and is easily soluble in acidic solution, with poor stability, which limits its application in acidic systems.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Add 200mL of 0.25% (W / V) chitosan acetic acid solution into a 500mL three-necked flask, add 0.0025g of graphite oxide, blow in nitrogen and ultrasonically for 30min, add 44mL of iron solution (FeCl 3 · 6H 2 O 7.2g, FeCl 2 4H 2 (2.92g), stirred for 1h. At 40°C, slowly add 40 mL of 28% (W / V) ammonia water dropwise, stir rapidly, and react for 20 minutes, then raise the temperature to 60°C, add 6.6 mL of epichlorohydrin dropwise, and react for 5 hours. Magnetic separation after cooling, washing with water until neutral, soaking in 0.5wt% HAc solution for 20 min (twice), washing with water until neutral, to obtain graphite oxide / chitosan magnetic composite adsorbent, which can be oriented and separated by an external magnetic field.

[0035] Graphite oxide / chitosan magnetic adsorbent for Cu 2+ The adsorption capacity is 104mg / g, and the adsorption capacity for reactive brilliant red is 520mg / g.

Embodiment 2

[0037] Add 20 mL (dry weight 0.364 g) of graphite oxide / chitosan magnetic composite adsorbent to a three-necked flask, add 10 mL of an aqueous solution containing 0.6 g of reactive brilliant red, stir at 60°C for 30 min, add 1.6 g of sodium chloride, After reacting for 30 minutes, raise the temperature to 80°C, add sodium carbonate to make the pH value about 10, continue to react for 6 hours, cool, and magnetically separate. Wash with deionized water until it is colorless, then wash with methanol, 2 mol / L sodium chloride, 6 mol / L urea, and acetone in sequence to obtain the reactive brilliant red-coupled adsorbent, which is stored for future use.

[0038] Graphite Oxide / Magnetic Chitosan Reactive Brilliant Red Dye Ligand Composite Adsorbent for Cu 2+The adsorption capacity is 100 mg / g, the adsorption capacity for bovine serum albumin is 950 mg / g, and the adsorption capacity for methylene blue is 700 mg / g.

Embodiment 3

[0040] Add 200mL of 0.25% (W / V) chitosan acetic acid solution into a 500mL three-necked flask, add 0.0125g of graphite oxide, blow in nitrogen and ultrasonically for 30min, add 44mL of iron solution (FeCl 3 · 6H 2 O 7.2g, FeCl 2 4H 2 (2.92g), stirred for 1h. At 40°C, slowly add 40 mL of 28% (W / V) ammonia water dropwise, stir rapidly, and react for 20 minutes, then raise the temperature to 60°C, add 6.6 mL of epichlorohydrin dropwise, and react for 5 hours. Magnetic separation after cooling, washing with water until neutral, soaking in 0.5wt% HAc solution for 20 min (twice), washing with water until neutral, to obtain graphite oxide / chitosan magnetic composite adsorbent, which can be oriented and separated by an external magnetic field.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
adsorption capacityaaaaaaaaaa
adsorption capacityaaaaaaaaaa
adsorption capacityaaaaaaaaaa
Login to View More

Abstract

The invention relates to a graphite oxide / magnetic chitosan composite adsorbent and a preparation method thereof. The composition of the graphite oxide / magnetic chitosan composite adsorbent is as follows: a weight ratio of the chitosan to the graphite oxide is (40:1)-(300:1), and a weight ratio of the chitosan to iron (existing in the form of Fe3O4) is (10:1)-(1:5); the composition of a graphite oxide / magnetic chitosan dye ligand composite adsorbent is as follows: and a weight ratio of the chitosan to the graphite oxide is (40:1)-(300:1), a weight ratio of the chitosan to iron (existing in the form of Fe3O4) is (10:1)-(1:5), and a weight ratio of the dye ligand to the chitosan is (2:100)-(20:100). The invention has the characteristics that: the preparation technology of the composite adsorbent is relatively simple, and the technological parameters are easy to control. The composite adsorbent has good adsorption performance and high adsorption capacity, and can be recycled under the effect of an external magnetic field, thus having good reusability. The graphite oxide / magnetic chitosan composite adsorbent is expected to be used for disposing wastewater containing heavy metal ions, proteins and dyes.

Description

technical field [0001] The invention relates to a graphite oxide / magnetic chitosan composite adsorbent and a preparation method thereof. Background technique [0002] Adsorbents are solid substances that can effectively absorb certain components from gases or liquids, and have broad application prospects in the fields of environmental protection, biomedicine, food, and chemical engineering. Adsorbents generally have the following characteristics: large specific surface area, suitable pore structure and surface structure; strong adsorption capacity for adsorbate; can be regenerated repeatedly; have good mechanical strength, etc. Adsorbents are generally divided into inorganic and organic adsorbents. Commonly used inorganic adsorbents include molecular sieves, silica gel, activated carbon, and alumina. Inorganic adsorbents have good mechanical strength, but the adsorption capacity is not very strong, and the adsorption selectivity is poor. Organic adsorbents are mostly synt...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/24B01J20/30
Inventor 肖玲陈艺羡
Owner WUHAN UNIV