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Magnetic graphene oxide-chitosan composite material as well as preparation method and application thereof

A composite material and oxide stone technology is applied in the field of magnetic graphene oxide-chitosan composite material and its preparation, which can solve the problems of limited adsorption capacity of adsorbents, and achieves many adsorption sites, large specific surface area, and easy separation and recovery. Effect

Inactive Publication Date: 2018-08-03
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Studies in recent years have shown that magnetic graphene oxide materials are easy to achieve solid-liquid separation after adsorption due to the loading of magnetic nanoparticles, and have good application prospects, but the adsorption capacity of the adsorbent is limited.

Method used

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  • Magnetic graphene oxide-chitosan composite material as well as preparation method and application thereof
  • Magnetic graphene oxide-chitosan composite material as well as preparation method and application thereof
  • Magnetic graphene oxide-chitosan composite material as well as preparation method and application thereof

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Experimental program
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Effect test

Embodiment 1

[0034] The preparation method of magnetic graphene oxide-chitosan composite material comprises the following steps:

[0035] 1) Ultrasonic disperse 50mL of 1mg / mL graphene oxide for 30min. 0.5g FeCl 3 ·6H 2 O and 0.2gFeCl 2 4H 2 O was added into 25ml of ultrapure water and stirred to obtain an iron salt solution. Under the conditions of 60°C constant temperature water bath and nitrogen gas, add the graphene oxide dispersion liquid after ultrasonic in the round bottom three-neck flask, then add the iron salt solution, and then quickly add 30% ammonia water to make the pH of the mixed solution reach 10, at 300r The reaction was continued for 1 h with stirring. The obtained product was separated and collected by a magnet, washed five times with ultrapure water and absolute ethanol, and dried in a vacuum oven at 40° C. to obtain magnetic graphene oxide.

[0036] 2) Add 0.05 g of the prepared magnetic graphene oxide into 50 mL of ultrapure water for ultrasonic dispersion for ...

Embodiment 2

[0039] The magnetic graphene oxide-chitosan composite material prepared by embodiment 1 is applied to the adsorption treatment of Co(II), comprising the following steps: the background ion NaCl concentration is respectively 0.1mol / L, 0.01mol / L, 0.001mol / L In the case of L, add Co(II) solution in the magnetic graphene oxide-chitosan composite material solution, the concentration of magnetic graphene oxide-chitosan composite material in the mixed solution is 0.5g / L, Co(II) The concentration is 10mg / L; add HCl or NaOH to adjust the pH of the solution to 2-11 respectively; put it in an electrothermal constant temperature water bath shaking water tank for 300min to achieve adsorption equilibrium of Co(II) on magnetic graphene oxide-chitosan ; After separating the solid-liquid with a magnet, measure the unadsorbed Co(II) concentration in the solution at a wavelength of 578nm by using a UV spectrophotometer; calculate its adsorbed percentage according to the concentration difference o...

Embodiment 3

[0041] The magnetic graphene oxide-chitosan composite material prepared by embodiment 1 is applied to the adsorption treatment of Co(II), comprising the following steps: under the situation that the background ion NaCl concentration is 0.01mol / L, in the magnetic graphene oxide- Add Co(II) solution in the chitosan composite solution, the concentration of magnetic graphene oxide-chitosan composite in the mixed solution is 0.5g / L, and the Co(II) concentration is 10mg / L; add HCl or NaOH to adjust the solution pH to 7; placed in an electrothermal constant temperature water bath oscillating water tank for 5-300min respectively; after separating the solid-liquid with a magnet, measure the unadsorbed Co(II) concentration in the solution at a wavelength of 578nm with a UV spectrophotometer; The concentration difference of Co(II) in the solution, calculate the percentage of its adsorption, the result is as follows Figure 7 shown. It can be seen that: the adsorption reaction time is wi...

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Abstract

The invention discloses a magnetic graphene oxide-chitosan composite material as well as a preparation method and application thereof. The composite material is prepared from graphene oxide, surface-loaded magnetic nano particles, and chemically-cross-linked high polymer material chitosan. The preparation method comprises the following steps: firstly, directly synthesizing magnetic nano particlesFe3O4 in a graphene oxide dispersion solution under a nitrogen protection condition, loading the magnetic nano particles onto the surface of the graphene oxide, and thus obtaining the magnetic graphene oxide material (M / Go); and then cross-linking the magnetic graphene oxide and the chitosan by adopting a secondary chemical cross-linking method, and thus obtaining the magnetic graphene oxide-chitosan composite material (MGC). The composite material used as an absorbent has the characteristics of large specific surface area, high absorption capacity, short absorption balance time, high magneticfield intensity and the like, is easy for rapidly absorbing Co(II) in the waste water and for separating solid and liquid, and is good in effect.

Description

technical field [0001] The invention belongs to the technical field of nanocomposite new technology and radioactive wastewater treatment, and specifically relates to a magnetic graphene oxide-chitosan composite material and its preparation method and application. Background technique [0002] The safe treatment and disposal of radioactive waste is an important guarantee for the healthy and sustainable development of the nuclear industry. The entire industrial chain of the nuclear industry and the radioactive liquid waste produced in nuclear research and medical treatment must be effectively treated in order to reduce the radioactive hazards to the environment and the public. As a new type of carbon material, graphene has the advantages of large specific surface area, strong adsorption capacity, and short adsorption equilibrium time, and has attracted much attention in the field of radioactive wastewater treatment. A large number of oxygen-containing tube energy groups such ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/24B01J20/30B01J20/28C02F1/28C02F1/62C02F101/20
CPCB01J20/06B01J20/20B01J20/24B01J20/28009B01J2220/46B01J2220/4806B01J2220/4825C02F1/281C02F1/286C02F2101/20
Inventor 赵耀林邓佳杨琳陈忠村柳文波李永宏
Owner XI AN JIAOTONG UNIV
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