Preparation method and application of oxidized graphene and magnetic chitosan compound

A technology of chitosan and graphene, which is applied in the field of biological adsorption materials and water treatment, can solve the problem of the reduction of magnetic chitosan adsorption capacity, etc., and achieve the effect of simple and easy operation, large-scale industrial production and abundant sources

Inactive Publication Date: 2016-09-21
HOHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, during the magnetization process, some adsorption sites of chitosan were occupied by magnetic nanoparticles and the physicochemical properties were changed, resulting in a decrease in the adsorption capacity of magnetic chitosan.

Method used

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  • Preparation method and application of oxidized graphene and magnetic chitosan compound
  • Preparation method and application of oxidized graphene and magnetic chitosan compound
  • Preparation method and application of oxidized graphene and magnetic chitosan compound

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] A preparation method of graphene oxide and magnetic chitosan composite, comprising the following steps:

[0027] Step 1, at room temperature, 1.2536g of FeCl 2 4H 2 O and 3.4624g FeCl 3 ·6H 2 Dissolve O in 50ml of ultrapure water, then add it dropwise to 200ml of ultrapure water containing 8ml of ammonia water (the concentration of ammonia water is 25%), keep stirring at 90°C for 180min, let the solution cool to room temperature, and magnetically separate The precipitate was obtained, and then washed with ultrapure water until neutral, and finally the precipitate was vacuum-dried at a temperature of 60°C to obtain magnetic particles;

[0028] Step 2. At room temperature, dissolve 0.9g of chitosan in 90ml of acetic acid (the concentration of acetic acid is 3%) solution, then ultrasonically disperse 0.3g of the magnetic particles in step 1 in the above solution, and then add 1ml of glutaraldehyde (glutaraldehyde concentration is 25%) solution, and continuously stirred...

Embodiment 2

[0031] The graphene oxide and magnetic chitosan compound prepared in embodiment 1 are applied to the removal of triclosan wastewater, comprising the following steps: first configure the initial concentration of 0.75, 1.85, 3.00, 4.15, 5.60 and 6.35mg / L 6 groups of triclosan solutions, 25ml of each group of samples, adjusting the pH of the solution to 6.5, adding the compound prepared in Example 1, the dosage of the compound is 0.28g / L, and carrying out the adsorption reaction in a rotary incubator, The rotational speed was 7 rpm, and after 36 hours, the compound was separated from the wastewater by applying an external magnetic field. The content of unadsorbed triclosan in wastewater was detected by high-performance liquid chromatography ultraviolet detector (HPLC). The model was Watets2695, and the chromatographic column model (4.6×150 mm Bridge-C18). The detection method: the mobile phase was water-acetonitrile (25:75; v:v), flow rate 1.0 mL / min, column temperature 30°C, inj...

Embodiment 3

[0036] The graphene oxide and magnetic chitosan compound prepared in embodiment 1 are applied to the removal of triclosan wastewater, comprising the following steps: first configure 5 groups of 25ml, the concentration is the triclosan solution of 1.85mg / L, adjust the solution The pH is 3.5, 5.0, 6.5, 8.0, 9.5, adding the complex prepared in Example 1, the dosage of the complex is 0.28g / L, and the adsorption reaction is carried out in a rotary incubator with a rotating speed of 7rpm. After 36h The complexes are separated from the wastewater by means of an external magnetic field. The content of unadsorbed triclosan in wastewater was detected by high performance liquid chromatography with ultraviolet detector (HPLC).

[0037] The adsorption efficiency of the complex to triclosan was measured at different pH values, as shown in Table 2 below. It can be seen from the table that when the pH of the solution is 3.5, the degradation rate is 85.28%, and when the pH of the solution is 9...

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Abstract

The invention discloses a preparation method and an application of an oxidized graphene and magnetic chitosan compound. The preparation method comprises the following steps: firstly, nano magnetic particles are prepared; the magnetic particles are taken as carriers and coated with chitosan by means of glutaraldehyde; magnetic chitosan is covalently bound to the surface of oxidized graphene, and the compound is obtained. The composite is applied in steps as follows: 0.1-1 g of the composite is added to a liter of triclosan waste water with the concentration being 0.5-10 mg / L, pH of the mixture is adjusted to range from 3 to 10, the mixture is subjected to batch adsorption at the temperature of 10-50 DEG C for 1-36 h, then the composite is separated from water by the aid of a magnet, and the composite is obtained. The oxidized graphene and magnetic chitosan compound has the advantages of high adsorption performance, low cost, quick separation and recovery, environment-friendliness and the like.

Description

technical field [0001] The invention belongs to the technical field of biological adsorption materials and water treatment, in particular to a preparation method and application of graphene oxide and magnetic chitosan composite. Background technique [0002] With the rapid development of modern medical technology, a large number of antibiotics, cardiovascular drugs, bactericidal disinfectants, etc. are widely used in people's daily life. As a widely used antibacterial agent, triclosan is widely used in the fields of medicine, detergent and cosmetics, and has been used in the development of more than 200 products. After this kind of organic matter is used by humans, it enters the sewage treatment plant through the urban drainage pipe network. Due to the low degradation rate of triclosan in the conventional biological treatment process of the current sewage treatment plant, a large amount of triclosan eventually enters the natural water environment. There are related reports ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/24B01J20/28C02F1/28C02F101/36
CPCB01J20/24B01J20/20B01J20/28009C02F1/281C02F1/286C02F1/288C02F2101/36
Inventor 纪靓靓白朝暾邓丽萍杜俊洋
Owner HOHAI UNIV
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