Chitosan magnetic nano particle as well as preparation method and application thereof

A technology of magnetic nanoparticles and chitosan, which is applied in chemical instruments and methods, other chemical processes, alkali metal oxides/hydroxides, etc., can solve the problems of toxic cross-linking agents, and achieve simple preparation process and good effect , time-consuming effect

Inactive Publication Date: 2012-06-13
HUNAN NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, during the synthesis of these chitosan-functionalized magnetic particles, toxic cross-linking agents were added

Method used

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  • Chitosan magnetic nano particle as well as preparation method and application thereof
  • Chitosan magnetic nano particle as well as preparation method and application thereof
  • Chitosan magnetic nano particle as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] The chitosan magnetic nanoparticle of the present embodiment is the magnetic nanoparticle of chitosan modification, and its structural formula is CTS-Fe 3 o 4 NPs with an average particle size of 8.2 nm.

[0020] The preparation method of the chitosan magnetic nanoparticles of the present embodiment may further comprise the steps:

[0021] (1) Dissolve 1.3g of chitosan in 100mL of 0.5% aqueous hydrochloric acid solution by volume, add 0.13g of sodium dodecylsulfonate, and ultrasonically stir the mixed solution at 100rpm to fully dissolve and mix well. Nitrogen deoxygenation for 30 minutes;

[0022] (2) Warm up the mixed solution treated in step (1) to 50°C, add 5.8g of ferric nitrate and 2.3g of ferrous sulfate under stirring at 1300rpm; after stirring at 1300rpm for 5min, add 10mL of 25wt% ammonia water while stirring , adjust the pH to 9, and then react for 1.5 h under the protection of nitrogen;

[0023] (3) Stop the reaction, let the mixed solution obtained in ...

reference example

[0027] Preparation of standard solution: Accurately weigh 0.15 g of analytically pure Cd(NO 3 ) 2 , Pb(NO 3 ) 2 , Cu(NO 3 ) 2 and Zn(NO 3 ) 2 In a 100 mL small beaker, add water to dissolve, then transfer to a 100 mL volumetric flask, and constant volume, these four solutions are four ion stock solutions; respectively pipette a certain amount of the four stock solutions, and dilute with water to form a mixed standard solution , and then diluted into a series of standard solutions with different concentrations, and the stock solutions and standard solutions were placed in a refrigerator at 4 °C for later use.

[0028] The chitosan magnetic nanoparticles of the present embodiment are used for the test of removing heavy metal ions in waste water, as follows:

[0029] (1) Preparation of simulated wastewater: Pipette a certain amount of four stock solutions, dilute with water to form Cd 2+ , Pb 2+ 、Cu 2+ and Zn 2+ The four heavy metal ions are all 50 ppm mixed standard s...

Embodiment 2

[0037] The chitosan magnetic nanoparticle of the present embodiment is the magnetic nanoparticle of chitosan modification, and its structural formula is CTS-Fe 3 o 4 NPs with an average particle size of 8.2 nm.

[0038] The preparation method of the chitosan magnetic nanoparticles of the present embodiment may further comprise the steps:

[0039] (1) Dissolve 1.6 g of chitosan in 100 mL of 0.5% aqueous hydrochloric acid solution, add 0.13 g of sodium dodecylsulfonate, and stir ultrasonically at 100 rpm to fully dissolve and mix, then pass through Nitrogen deoxygenation for 30 minutes;

[0040] (2) Warm up the mixed solution treated in step (1) to 50°C, then add 5.8 g of ferric nitrate and 2.3 g of ferrous sulfate under vigorous stirring at 1300 rpm, stir for another 5 minutes, and then add again under vigorous stirring at 1300 rpm Add 10 mL of 25wt% ammonia water, adjust the pH to 10, and then react for 1.5 h under the protection of nitrogen;

[0041] (3) Stop the reactio...

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Abstract

The invention relates to a chitosan magnetic nano particle as well as a preparation method and application thereof. The structural formula of the chitosan magnetic nano particle is CTS-Fe3O4NPs, and the particle size is 5-14 nm. The invention also relates to a preparation method and application of the chitosan magnetic nano particle. The chitosan magnetic nano particle provided by the invention has small particle size and large specific surface area and is very easy to be combined with a target object. The speed of removing heavy metal ions in waste water is fast, the extraction rate is high, and the chitosan magnetic nano particle can be reproduced and can be used for removing water-soluble acid dye and phenol substances in waste water. The chitosan magnetic nano particle has particular magnetic responsibility and can be directionally separated through an external magnetic field without centrifugal operation, which is beneficial to simplifying and automating the separation process. The synthetic process is simple and fast, and no toxic substance is used. The entire preparation process and the removal process are easy to operate and consume short time, the efficiency can be improved, and manpower and energy can be saved. The chitosan magnetic nano particle is especially applicable to removing heavy metal ions in waste water.

Description

technical field [0001] The invention relates to a chitosan magnetic nano particle, a preparation method and application thereof, in particular to a chitosan magnetic nano particle capable of removing heavy metal ions, a preparation method and an application thereof. Background technique [0002] Traditional methods for removing heavy metal ions in wastewater include chemical precipitation, electrochemical method, physical adsorption method, and membrane separation method. These methods have their own advantages, but they all have the disadvantages of large reagent requirements, low product recovery, and unsatisfactory economic benefits. , cumbersome operation and secondary pollution. At present, the research on magnetic particles for removing heavy metal ions has achieved certain results. CN200910050524.0 discloses a magnetic composite microsphere material with a chitosan-polyacrylamide complex as the shell and a magnetic material as the core. The material is prepared by th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/24B01J20/28B01J20/30C02F1/28C02F1/62
Inventor 马铭金红红张君芳谢青季唐浩
Owner HUNAN NORMAL UNIVERSITY
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