Magnetic nano-chitosan microspheres and preparation method thereof

A chitosan microsphere, magnetic nanotechnology, applied in chemical instruments and methods, water/sludge/sewage treatment, biological water/sewage treatment, etc., can solve the difficulty of solid-liquid separation, difficult industrial application, and low adsorption strength and other problems, to achieve the effect of narrow particle size distribution, good biocompatibility, and large specific surface area

Active Publication Date: 2018-10-12
FUQING BRANCH OF FUJIAN NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Using free living bacteria as a biosorbent has the advantages of larger contact area, better mass transfer performance, and faster reaction, but it needs to maintain certain conditions such as temperature, nutrition, and pH during the adsorption process to ensure the growth of microor

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Embodiment 1: the preparation method of magnetic nano chitosan microsphere, comprises the steps:

[0029] ① Preparation of magnetic nanoparticles: Add dropwise 3mol / L sodium hydroxide aqueous solution to 80ml, 0.0375mol / L ferric chloride solution, adjust its pH value to 12, filter out the initial precipitate after the solution is layered, and use Alternately wash with absolute ethanol and deionized water for 3 times, place the primary precipitate in absolute ethanol and disperse with ultrasound;

[0030] Mix 20ml of octadecene and 13.5ml of oleic acid and ultrasonically disperse to prepare a dispersion liquid. Mix the primary precipitate dispersed in absolute ethanol with the dispersion liquid, ultrasonicate again for 30 minutes, and dry at 100°C for 5.5 Remove absolute ethanol within 1 hour to obtain the dispersed phase of primary precipitation;

[0031] The dispersed phase of the primary precipitation was placed in an autoclave, and reacted at 230° C. for 12 hours to...

Embodiment 2

[0034] Embodiment 2: the preparation method of magnetic nano chitosan microsphere, comprises the steps:

[0035] ① Preparation of magnetic nanoparticles: Add dropwise 3mol / L sodium hydroxide aqueous solution to 80ml, 0.0375mol / L ferric chloride solution, adjust its pH value to 11, filter out the initial precipitate after the solution is layered, and use Alternately wash with absolute ethanol and deionized water for 3 times, place the primary precipitate in absolute ethanol and disperse with ultrasound;

[0036]Mix 20ml of octadecene and 14.3ml of oleic acid and ultrasonically disperse to prepare a dispersion liquid, mix the primary precipitate dispersed in absolute ethanol with the dispersion liquid, ultrasonicate again for 30 minutes, and dry at 100°C for 5 Remove absolute ethanol within 1 hour to obtain the dispersed phase of primary precipitation;

[0037] The dispersed phase of the primary precipitation was placed in an autoclave, and reacted at 210° C. for 14 hours to ob...

Embodiment 3

[0040] Embodiment 3: the preparation method of magnetic nano-chitosan microsphere, comprises the steps:

[0041] ① Preparation of magnetic nanoparticles: Add dropwise 3mol / L sodium hydroxide aqueous solution to 80ml, 0.0375mol / L ferric chloride solution, adjust its pH value to 13, filter out the initial precipitate after the solution is layered, and use Alternately wash with absolute ethanol and deionized water for 3 times, place the primary precipitate in absolute ethanol and disperse with ultrasound;

[0042] Mix 20ml of octadecene and 12.5ml of oleic acid and ultrasonically disperse to prepare a dispersion liquid, mix the primary precipitate dispersed in absolute ethanol with the dispersion liquid, ultrasonicate again for 30 minutes, and dry at 100°C for 6 Remove absolute ethanol within 1 hour to obtain the dispersed phase of primary precipitation;

[0043] The dispersed phase of the primary precipitation is placed in an autoclave, and reacted at 250°C for 10 hours to obta...

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PUM

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Abstract

The invention discloses magnetic nano-chitosan microspheres and a preparation method thereof, and belongs to the technical field of preparation of magnetic nanomaterials. The preparation method comprises the following steps: (1) adding NaOH into a ferric chloride solution for adjusting to alkaline, filtering initial precipitate, mixing the initial precipitate with a dispersion solution, and removing ethanol to obtain a dispersion phase of the initial precipitate; placing the dispersion phase of the initial precipitate into a high-pressure reaction kettle for reacting to obtain a dispersion phase of secondary precipitate, wherein the secondary precipitate is magnetic nanoparticles; (2) adding the magnetic nanoparticles into a chitosan solution, then adding an emulsifier and a fixative, separating to obtain a ternary precipitate, drying the ternary precipitate to obtain the magnetic nano-chitosan microspheres. The invention intends to provide a magnetic nanocarrier which has the characteristics of high biological property, carrying of various active groups, large specific surface area, porosity, narrow particle size distribution and the like. The magnetic nano-chitosan microspheres can perform rapid movement and separation under the action of an external magnetic field, so that the microspheres have the advantages of easiness in recovery, reproducibility and the like.

Description

technical field [0001] The invention relates to the technical field of magnetic nano material preparation, in particular to a magnetic nano chitosan microsphere and a preparation method thereof. Background technique [0002] Cr(VI) widely exists in industrial wastewater such as leather manufacturing, electroplating, printing, and metallurgy. It is very harmful to human body and environment, and is listed as the first type of toxic pollution element. important issue of environmental protection. For the treatment of chromium-containing wastewater, biological methods, ion exchange methods, electrolysis methods, chemical precipitation methods and adsorption methods are mainly used at present. [0003] Commonly used biosorbents include bacteria, fungi, algae, etc. The more studied microbial adsorbents include Motileum, Arthrobacter, filamentous fungi, yeasts, and algae, while the research on sheath bacteria as microbial adsorbents is relatively limited. Less, mainly because the...

Claims

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Application Information

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IPC IPC(8): C02F3/10C02F3/34C02F101/22
CPCC02F3/107C02F3/108C02F3/109C02F3/34C02F2101/22Y02W10/10
Inventor 郑虹杜可韩艳丽张雨婷
Owner FUQING BRANCH OF FUJIAN NORMAL UNIV
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