Porous magnetic chitosan gel microsphere with controllable particle size and preparation method thereof

A technology of chitosan gel and chitosan, which is applied in chemical instruments and methods, other chemical processes, water/sludge/sewage treatment, etc., can solve the problems of high preparation costs, extremely high requirements for reaction preparation conditions, and unsuitable acidity Wastewater treatment and other issues, to achieve the effect of simple preparation method and low preparation cost

Pending Publication Date: 2017-10-24
CHENGDU UNIVERSITY OF TECHNOLOGY +1
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Most of these methods have extremely high requirements on the reaction preparation conditions [13], or the preparation of gel microspheres needs to be completed through a complicated preparation process [14]. Not only the preparation cost is high, but also the emulsifier, crosslinking Poisonous and harmful chemical reagents such as reagents and initiators [15] ha

Method used

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  • Porous magnetic chitosan gel microsphere with controllable particle size and preparation method thereof
  • Porous magnetic chitosan gel microsphere with controllable particle size and preparation method thereof
  • Porous magnetic chitosan gel microsphere with controllable particle size and preparation method thereof

Examples

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Effect test

example 1

[0045] Example 1: Add 0.4g chitosan to a beaker, add 10~20ml of 2% acetic acid solution, dissolve and stir with a magnetic stirrer for 30min (3000r / min), and prepare Fe 2+ (0.5~1M), Fe 3+ (1~2M) mixed solution (molar ratio is 0.1~2.0), add chitosan solution and continue to stir for 30min (3000r / min), the solution changes from bright yellow to dark red. Prepare an alkaline soaking solution with deionized water, weigh a certain mass of sodium hydroxide and sodium citrate, so that the concentrations in the dissolved solution are 1-5M and 0.01-1M respectively. Use a peristaltic pump to drop the chitosan solution dropwise into the above-mentioned alkaline soaking solution. After soaking for 24 hours, apply a magnetic field to separate the magnetic chitosan gel microspheres, and rinse them with deionized water until they are neutral. The magnetic chitosan gel microspheres were soaked in deionized water and stored for later use. The functional groups and internal structure of the a...

example 2

[0046] Example 2: Take 1mmol / L of Pb 2+ Solution 3ml, add 0.15g magnetic chitosan gel microspheres as an adsorbent, after adsorption for 12h, measure the residual concentration of lead in the solution by flame atomic absorption spectrometry, and calculate its removal rate according to formula ①. SEM was used to compare the adsorbent before and after adsorption (see attached Figure 4 C, attached Figure 4 D).

[0047] Formula ①: removal rate = (C o -C e )*V / C o *100%

[0048] where C o is the initial concentration, C e is the adsorption equilibrium concentration, and V is the volume of the lead solution.

[0049] Calculated, the adsorbent for 1mmol / L of Pb 2+ The removal rate of the solution is over 90%.

[0050] attached figure 1 Each figure in the figure is an optical photograph reflecting the different properties of porous magnetic chitosan gel microspheres, with figure 1 In figure A, the gel microspheres are scattered at the bottom of the beaker without the act...

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Abstract

The invention provides a porous magnetic chitosan gel microsphere with controllable particle size based on an in-situ co-precipitation principle and a preparation method thereof. The preparation method comprises the following main steps: firstly, carrying out a complexation reaction on a mixed solution of Fe<2+>, Fe<3+> and chitosan to prepare precursor-induced pre-sol; secondly, dropwise dripping the pre-sol into an alkaline soaking solution containing NaOH, sodium citrate and the like for coprecipitating to generate nano-Fe3O4; thirdly, carrying out a crosslinking reaction on the pre-sol and then curing, wherein the crosslinked chitosan gel microsphere is of a porous reticular structure and the Fe3O4 is uniformly distributed in the chitosan gel microsphere. The particle size of the chitosan gel microsphere is controlled by adjusting the rotating speed of a peristaltic pump and the concentration of the solution. The chitosan gel microsphere prepared by the method has the advantages of abundant pores, large specific surface area, and high adsorption and acid resistance; in addition, the preparation method has the characteristics of simplicity, wide source in raw materials, low cost, easiness in separation and recovery, no secondary pollution and the like. The porous magnetic chitosan gel microsphere disclosed by the invention can be used for enrichment, recovery and contamination remediation of metals in mines, smelting plants, electronic factories, electroplating plants and radioactive wastewater.

Description

technical field [0001] The invention belongs to the field of environmental functional materials, and relates to a porous magnetic chitosan gel microsphere with controllable particle size and a preparation method. Background technique [0002] Heavy metals have the characteristics of high toxicity, refractory degradation and easy accumulation in organisms, which have caused great harm to the ecological environment and human health [1]. At present, the treatment methods of heavy metal wastewater mainly include chemical method, physical chemical method and biological method [2]. Among them, the chemical method and physical chemical method have high treatment efficiency and are widely used [3], but they have the limitations of secondary pollution and poor treatment effect on low-concentration heavy metal wastewater. In contrast, the biosorption method has gradually attracted the attention of researchers due to its advantages of high treatment efficiency, complete reaction, and ...

Claims

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Application Information

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IPC IPC(8): B01J20/24B01J20/28B01J20/30C02F1/28C02F1/62
CPCB01J20/06B01J20/22B01J20/24C02F1/281C02F1/286C02F1/288B01J20/28009B01J20/28021B01J20/28047C02F2101/20B01J2220/4825B01J2220/4812B01J2220/4806B01J2220/46
Inventor 蒲生彦马慧朱榕鑫徐柳邓代莉
Owner CHENGDU UNIVERSITY OF TECHNOLOGY
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