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Chitosan nanoscale iron preparation method

A chitosan nano, chitosan technology, applied in nanotechnology, metal processing equipment, transportation and packaging, etc., can solve the problems of easy dissolution and loss of chitosan, limited application scope, etc.

Inactive Publication Date: 2018-08-28
重庆智诚知识产权服务有限公司
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Problems solved by technology

However, chitosan is easy to dissolve and lose under acidic conditions, so its application range is limited to a certain extent.

Method used

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Embodiment Construction

[0012] The present invention will be described in detail below:

[0013] The preparation method of chitosan nano-iron comprises the following steps,

[0014] S1: Dissolving chitosan in HNO 3 In solution, obtain chitosan nitric acid solution;

[0015] S2: Add the above solution to FeSO 4 ·7H 2 In the O aqueous solution, stir for 10-15 minutes to make it evenly mixed;

[0016] S3: Add KBH drop by drop 4 The solution is stirred until there are no air bubbles, the nanometer zero-valent iron particles are separated by magnetic separation, and then washed three times with distilled water and ethanol respectively to obtain chitosan-coated nanometer zerovalent iron particles.

[0017] S4: Take the chitosan-coated nanometer zero-valent iron, dilute it with deionized water, stir at 50°C for 2 hours, slowly add bentonite, continue stirring for 10 hours, centrifuge, wash, and vacuum-dry at 55°C until constant quality, to obtain chitosan nano-iron.

[0018] Dissolving the dried chit...

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Abstract

A chitosan nanoscale iron preparation method comprises the following steps that chitosan is dissolved in an HNO3 solution, and the mixture is added into an FeSO4.7H2O aqueous solution to be evenly stirred; and a KBH4 solution is added dropwise, the mixture is stirred till no bubble exists, nano zero-valent iron particles are separated out through a magnetic separation method and washed three timeswith distilled water and ethyl alcohol, nanoscale zero-valent iron coated with the chitosan is obtained, dilution is carried out through deionized water, then bentonite is added slowly, continuous stirring, centrifugal separation, washing, suction filtration and drying are carried out successively, and chitosan nanoscale iron is obtained. The problem of settling difficulty after adsorption causedby purely using bentonite powder or chitosan is overcome through the chitosan nanoscale iron, and the method is suitable for soil cadmium pollution regulation and has the application and popularization value.

Description

technical field [0001] The invention relates to the technical field of biomaterials, in particular to a preparation method of chitosan nano-iron. Background technique [0002] In the in-situ remediation technology of heavy metal-contaminated soil, the use of non-metallic minerals to passivate heavy metals in soil is a useful technology. Almost all heavy metal ions can be adsorbed and fixed by bentonite, zeolite, sepiolite, attapulgite and other non-metallic minerals, thereby reducing their bioavailability. Addition of zeolite and tough nepheline syenite particles to cadmium-contaminated soils significantly reduced cadmium concentrations in crop roots and aboveground. Bentonite is a layered porous aluminosilicate mineral with adsorption and ion exchange properties. However, due to the complex formation conditions of bentonite, the low adsorption capacity and slow adsorption rate of heavy metal ions, modification treatment is often required. Chitosan is the deacetylated pro...

Claims

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Application Information

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IPC IPC(8): B22F9/24B22F1/02B82Y40/00
CPCB82Y40/00B22F9/24B22F1/07B22F1/16
Inventor 李丽
Owner 重庆智诚知识产权服务有限公司
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