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Alpha-ketoglutaric acid modified magnetic chitosan and preparation method and application thereof in field of cadmium-containing wastewater treatment

A technology of ketoglutaric acid and chitosan, applied in the field of α-ketoglutaric acid modified chitosan, can solve the problems of slow adsorption rate and long time for equilibrium, achieve high processing rate, reduce difficulty and cost, The effect of stable physical and chemical properties

Inactive Publication Date: 2014-03-05
HUNAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Its adsorption capacities for copper ions, zinc ions and cobalt ions are respectively 245.89mg / g (pH=7), 177.63mg / g (pH=7), 65.17mg / g (pH=5), but the above methods need The longer the time, the slower the adsorption rate

Method used

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  • Alpha-ketoglutaric acid modified magnetic chitosan and preparation method and application thereof in field of cadmium-containing wastewater treatment
  • Alpha-ketoglutaric acid modified magnetic chitosan and preparation method and application thereof in field of cadmium-containing wastewater treatment
  • Alpha-ketoglutaric acid modified magnetic chitosan and preparation method and application thereof in field of cadmium-containing wastewater treatment

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Experimental program
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Embodiment 1

[0037] The α-ketoglutarate-modified magnetic chitosan of the present invention is mainly prepared by nano co-condensation method and redox method, the magnetic nanoparticles are mainly composed of ferric oxide, and carbonyl groups and and Imino groups, α-ketoglutarate is mainly connected to chitosan through imino groups, and there are a large number of network structures between particles, which increases the magnetic properties of α-ketoglutarate-modified chitosan and other substances. Contact site. The α-ketoglutarate-modified magnetic chitosan of the present invention includes ferric iron tetroxide, chitosan and α-ketoglutarate, and the saturation magnetization value is 20~25emu / g, shows that the magnetic chitosan that this invention makes The adsorbent is very magnetic. Magnetic chitosan was prepared by ferric iron tetroxide and chitosan, the weight ratio of ferric iron tetroxide and chitosan was 1: (1.5-2.5), and the weight ratio of α-ketoglutaric acid and magnetic chito...

Embodiment 2

[0040] The preparation method of the magnetic chitosan modified by α-ketoglutaric acid of the present invention may further comprise the steps:

[0041] 1. Preparation of Fe3O4 suspension

[0042] Prepare 500 mL of a mixed solution containing 0.4 mol ferrous chloride and 0.6 mol ferric chloride, then fill with nitrogen for 30 minutes, add 4 mol / L ammonia solution in a 70°C water bath and strong mechanical stirring, and adjust the pH value to 10 After reacting for 30 minutes, the solid particles were collected by magnetic separation and washed repeatedly. After vacuum drying, magnetic iron ferric oxide nanoparticles were obtained. Put 0.1125 g of the ferric iron tetroxide nanoparticles prepared above in 150 mL of pure water and ultrasonicated for 30 minutes. A suspension of ferric oxide is obtained.

[0043] 2. Preparation of magnetic chitosan:

[0044] Firstly, 0.225g of chitosan is dissolved in 22.5ml of acetic acid solution with a mass fraction of 1%, to obtain an acetic a...

Embodiment 3

[0048] The preparation method of the magnetic chitosan modified by α-ketoglutaric acid of the present invention may further comprise the steps:

[0049] 1. Preparation of Fe3O4 suspension

[0050] Put 0.09 g of ferric oxide powder in water for half an hour to ultrasonically disperse to obtain ferric oxide suspension after ultrasonic dispersion.

[0051] 2. Preparation of Magnetic Chitosan

[0052] First, 0.225g of chitosan was dissolved in 11.25ml of acetic acid solution with a mass fraction of 2%, to obtain an acetic acid solution containing chitosan, and then under the condition of mechanical stirring, the above-mentioned preparation containing The acetic acid solution of chitosan was added to the ferric oxide suspension, and finally 5.5ml of sodium tripolyphosphate solution with a mass fraction of 2% was added dropwise to the above mixed solution, and after continuous stirring for 10 hours, it was separated by a magnet and passed through Wash with ethanol and clear water ...

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Abstract

The invention provides alpha-ketoglutaric acid modified magnetic chitosan. The alpha-ketoglutaric acid modified magnetic chitosan contains ferroferric oxide, chitosan and alpha-ketoglutaric acid and has the saturated magnetization value of 20-25emu / g, wherein magnetic chitosan is prepared from ferroferric oxide and chitosan, modified magnetic chitosan is of a reticular structure, peak values of functional groups, such as Fe-O bonds and the like, appear in an infrared spectrogram, and an agglomeration phenomenon is expressed. A preparation method of the alpha-ketoglutaric acid modified magnetic chitosan comprises the steps of adding an acetic acid solution containing chitosan into a ferroferric oxide suspension, adding a sodium tripolyphosphate solution, reacting and separating, so as to obtain the magnetic chitosan; then, adding alpha-ketoglutaric acid into an acetic acid buffer solution containing the magnetic chitosan, adding a sodium borohydride solution, and separating, thereby obtaining the alpha-ketoglutaric acid modified magnetic chitosan. The alpha-ketoglutaric acid modified magnetic chitosan has stable physical and chemical properties and strong magnetism; during the treatment of wastewater containing cadmium ions, the treatment efficiency is high, and the alpha-ketoglutaric acid modified magnetic chitosan can be repeatedly used and is convenient to recover.

Description

technical field [0001] The invention relates to an alpha-ketoglutarate-modified chitosan, in particular to an alpha-ketoglutarate-modified magnetic chitosan, a preparation method and an application in the field of cadmium-containing wastewater treatment. Background technique [0002] Heavy metal ions are very harmful. For example, cadmium ions are widely found in industrial wastewater such as leather manufacturing, electroplating, printing, and metallurgy. They are highly toxic, carcinogenic, and water-soluble. At the same time, they can spread through the food chain and eventually damage the kidneys of the human body. and bones. From Toyama Prefecture, Japan, itai-itai disease, which shocked all mankind, was caused by oral administration of cadmium-containing water. Therefore, the removal of cadmium ions in water has attracted widespread attention at home and abroad. [0003] Among the many removal methods of heavy metal ions, especially cadmium ions, the adsorption method...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/24B01J20/28B01J20/30C02F1/28C02F1/62C08B37/08
Inventor 杨贵德汤琳雷晓霞曾光明蔡叶章毅周耀渝汤晶
Owner HUNAN UNIV
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