Preparation method for novel magnetic chitosan composite microsphere antibiotic adsorbent

A technology of composite microspheres and chitosan, applied in chemical instruments and methods, alkali metal compounds, alkali metal oxides/hydroxides, etc., can solve the problems of poor mechanical properties, low density, small and wide application, etc. Simple preparation process, high adsorption capacity, good thermal stability

Inactive Publication Date: 2014-05-21
JIANGSU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the disadvantages of chitosan, such as poor mechanical properties, low density, easy caking and gel formation, and low solubility under weak acid conditions, limit its wide application in the removal of pollutants in the environment.

Method used

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  • Preparation method for novel magnetic chitosan composite microsphere antibiotic adsorbent
  • Preparation method for novel magnetic chitosan composite microsphere antibiotic adsorbent
  • Preparation method for novel magnetic chitosan composite microsphere antibiotic adsorbent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] (1) Fe 3 o 4 / HNTs complex synthesis;

[0029] 4.77 g FeCl 3 ·6H 2 O and 0.35 g of halloysite nanotube powder were added to 138 mL of distilled water, and after ultrasonic dispersion for 30 min, mechanical stirring was continued for 3 h to obtain a stable suspension. Then in N 2 2.10 g FeCl under protection 2 4H 2 Add O to the above suspension, continue to stir the mixed solution vigorously for 30 minutes, then raise the temperature to 80°C, slowly add 10-15 mL of concentrated ammonia water, and react for 0.5-1.0 h under vigorous stirring, and permanently remove the black product with Nd-Fe-B Magnet separation, the product is fully washed with distilled water until neutral, vacuum dried at 50-60°C to obtain Fe 3 o 4 / HNTs complex; Figure 1-4 Characterization of physical and chemical properties of magnetic chitosan composite microspheres.

[0030] (2) Preparation of novel antibiotic adsorbents with magnetic chitosan composite microspheres;

[0031] 0.50 g of...

experiment example 1

[0036] Take 20 ml for an initial concentration of 100 mg L -1 The tetracycline solution was added to the colorimetric tube, and 20 mg of magnetic chitosan composite microsphere adsorbent was added, and the test solution was placed at 25 o Stand in the water bath of C for 2, 4, 6, 8, 10, 20, 30, 40, 50, 60, 70 and 80 min, respectively. After the standing time is completed, the supernatant is separated and collected by Nd-Fe-B permanent magnets, and the concentration of unadsorbed tetracycline molecules is measured by an ultraviolet-visible spectrophotometer, and the adsorption capacity is calculated according to the results. Figure 5 It shows that the magnetic chitosan composite microspheres have good adsorption kinetics, and the adsorption equilibrium is basically reached within 80 minutes, and the adsorption rate is fast.

experiment example 2

[0038] Take 20ml and the initial concentration is 20, 40, 60, 80, 100, 120, 140, 160, 180, 200 mg L -1 The tetracycline solution was added to the colorimetric tube, and 20 mg magnetic chitosan composite microsphere adsorbent was added respectively, and the test solution was placed at 25 o After standing in a water bath of C for 3.0 h, the supernatant was separated and collected by a Nd-Fe-B permanent magnet, and the concentration of unadsorbed tetracycline molecules was measured by a UV-visible spectrophotometer, and the adsorption capacity was calculated based on the results. Image 6 As shown, the saturated adsorption capacity of the magnetic chitosan composite microsphere adsorbent is 38.76 mg g -1 .

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Abstract

The invention relates to a preparation method for a novel magnetic chitosan composite microsphere antibiotic adsorbent, belonging to the technical field of preparing environment materials. The preparation method comprises the following steps: by taking FeCl3.6H2O, FeCl2.4H2O and halloysite nanotubes HNTs as raw materials, preparing Fe3O4/HNTs compound through co-precipitation, then by taking glutaraldehyde as a crosslinking agent and Fe3O4/HNTs compound and chitosan as raw materials, synthesizing the magnetic chitosan composite microsphere adsorbent by adopting an emulsification crosslinking method, and separating tetracycline (TC) in water environment. The static adsorption experiments are used for researching the adsorption balance and dynamics performance of the prepared adsorbent. Results show that the obtained novel magnetic chitosan composite microsphere antibiotic adsorbent has fast adsorption dynamics property, high adsorption capacity and high magnetic separation capability.

Description

technical field [0001] The invention relates to a method for preparing a novel antibiotic adsorbent of magnetic chitosan composite microspheres, which belongs to the technical field of environmental material preparation. Background technique [0002] Over the past few decades, antibiotics have been widely used to treat diseases in humans and animals and to increase productivity in livestock and aquaculture. However, it is very difficult for these antibiotics to be completely metabolized in organisms, and the residues of antibiotics in the environment can induce the growth of drug-resistant bacteria and have adverse effects on human health. Therefore, it is necessary to find a high-efficiency and low-cost method for removing antibiotic residues in the environment. [0003] Various methods have been used to remove antibiotic residues in the environment, for example, ozonation, photo-assisted-Fenton reaction, photocatalytic degradation and adsorption, etc. Among these methods...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/24B01J20/28B01J20/30
Inventor 马威戴江栋潘建明李春香闫永胜
Owner JIANGSU UNIV
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