Preparation method of magnetic chitosan composite microsphere adsorbent

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

Inactive Publication Date: 2014-07-16
JIANGSU UNIV
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  • Summary
  • Abstract
  • Description
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  • Application Information

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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 of magnetic chitosan composite microsphere adsorbent
  • Preparation method of magnetic chitosan composite microsphere adsorbent
  • Preparation method of magnetic chitosan composite microsphere adsorbent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] (1) Nano Fe 3 o 4 Synthesis;

[0025] 4.72g FeCl 3 ·6H 2 O and 1.72 g FeCl 2 4H 2 O was added to 96,6 mL of distilled water, followed by N 2 Stir mechanically under protection for 5-10 minutes to obtain a stable solution, then raise the temperature to 80°C, add concentrated ammonia water drop by drop, adjust the pH value of the solution to 10-11, react under vigorous stirring for 0.5-1.0 h, and wash the black product with Nd - Fe-B permanent magnet separation, the product is fully washed with distilled water until neutral, vacuum dried and ground at 50-60°C to obtain nano-Fe 3 o 4 .

[0026] (2) Preparation of novel magnetic chitosan composite microsphere adsorbent;

[0027] 0.50 g of chitosan was added to 25 mL of 2 % acetic acid solution to form a stable solution under mechanical stirring, and 0.1 g of Fe 3 o 4 and 0.15g kaolin were added to the above solution, and mechanically stirred for 2 h; 100 mL liquid paraffin and 4 mL Span-80 were added to the above...

experiment example 1

[0036] Take 20 ml for an initial concentration of 120 mg L -1 Add the ciprofloxacin hydrochloride solution into the colorimetric tube, add 20 mg magnetic chitosan composite microsphere adsorbent, put the test solution at 25 o Stand in the water bath of C for 2, 4, 6, 8, 10, 20, 30, 40, 50 and 60 min, respectively. After the standing time was completed, the supernatant was separated and collected by a Nd-Fe-B permanent magnet, and the molecular concentration of unadsorbed ciprofloxacin hydrochloride was measured by an ultraviolet-visible spectrophotometer, and the adsorption capacity was calculated according to the result. Figure 5 It shows that the magnetic chitosan composite microspheres have good adsorption kinetics, and the adsorption equilibrium is basically reached within 60 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 mg L -1 Add the ciprofloxacin hydrochloride solution into the colorimetric tube, add 20 mg magnetic chitosan composite microsphere adsorbent respectively, put the test solution at 25 o After standing in the water bath of C for 3.0 h, the supernatant was separated and collected by Nd-Fe-B permanent magnet, and the molecular concentration of unadsorbed ciprofloxacin hydrochloride was measured by UV-Vis spectrophotometer, and the adsorption capacity was calculated according to the results. Figure 6 It is shown that the saturated adsorption capacity of the magnetic chitosan composite microsphere adsorbent is 38.61 mg g -1 .

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Abstract

The invention relates to a preparation method of a magnetic chitosan composite microsphere adsorbent, which belongs to the technical field of environmental material preparation. The preparation method comprises the following steps: firstly with FeCl3. 6H2O and FeCl2.4H2O as raw materials, preparing nano Fe3O4 by a coprecipitation process; and secondly, with glutaraldehyde as a crosslinking agent and Fe3O4, kaolin and chitosan as raw materials, synthesizing the novel magnetic chitosan composite microsphere adsorbent by an emulsification crosslinking process. The magnetic chitosan composite microsphere adsorbent is used for separating ciprofloxacin hydrochloride out of a water environment. The adsorption performance and the dynamic performance of the prepared adsorbent are researched in a static adsorption experiment. The results show that the novel magnetic chitosan composite microsphere adsorbent obtained by the method has a rapid adsorption dynamics characteristic, a high adsorption capacity and high magnetic-separation efficiency.

Description

technical field [0001] The invention relates to a preparation method of a novel magnetic chitosan composite microsphere adsorbent, belonging to the technical field of environmental material preparation. Background technique [0002] With the rapid development of industry and the concentration of urban population, people emit more and more pollutants in production and life, and the impact of pollutants on the human environment is becoming more and more serious. Environmental issues have become one of the major issues facing the world today. Various methods have been used to remove pollutants in the environment, such as ozonation, photo-assisted-Fenton reaction, photocatalytic degradation, and adsorption. Among these methods, adsorption is considered to be one of the most effective methods due to its simple operation, high efficiency, and economy. Chitosan is a high-performance natural polysaccharide material with a large number of hydroxyl groups and amino groups, which can...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/26B01J20/28B01J20/30C02F1/28C02F101/38
Inventor 马威戴江栋潘建明朱文静于欣平李春香闫永胜
Owner JIANGSU UNIV
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