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Magnetic nano-chitosan loaded sheath bacterial composite biological adsorbent and preparation method thereof

A biosorbent, magnetic nanotechnology, applied in alkali metal compounds, chemical instruments and methods, other chemical processes, etc., can solve the problems of difficult industrial application, difficult solid-liquid separation, low adsorption strength, etc., to increase mechanical strength, The effect of high adsorption capacity and improved adsorption performance

Inactive Publication Date: 2018-11-09
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 microorganisms. , and live bacteria are used as adsorbents, and their physical and chemical properties have certain defects, such as the difficulty of solid-liquid separation in the later stage, poor stability, and low adsorption strength, which make it difficult to realize industrial applications.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Embodiment 1: the preparation method of magnetic nano-chitosan loaded sheath bacterial composite biosorbent, comprises the steps:

[0032] 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;

[0033] 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;

[0034] The dispersed phase of the primary precipitation was placed in an autoclave, and r...

Embodiment 2

[0038] Embodiment 2: the preparation method of magnetic nano-chitosan-loaded sheath bacterial composite biosorbent, comprises the steps:

[0039] ① Preparation of magnetic nanoparticles: Add dropwise 3mol / L aqueous sodium hydroxide 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;

[0040] 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;

[0041] The dispersed phase of the primary precipitation was placed in an autoclave, and rea...

Embodiment 3

[0045] Embodiment 3: the preparation method of magnetic nano-chitosan-loaded sheath bacterial composite biosorbent, comprises the steps:

[0046] 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;

[0047] 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 initial precipitation;

[0048] The dispersed phase of the primary precipitation is placed in an autoclave, and reac...

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Abstract

The invention discloses a magnetic nano-chitosan loaded sheath bacteria composite biological adsorbent and a preparation method thereof, and belongs to the technical field of bio-adsorbent preparation. The preparation method comprises the following steps: (1) preparing magnetic nanoparticles; (2) adding the magnetic nanoparticles into a chitosan solution to prepare magnetic nano-chitosan microspheres; (3) loading sheath bacteria on the magnetic nano-chitosan microspheres. The composite biological adsorbent loaded with sheath bacteria can load the sheath bacteria, has a good Cr(VI) treatment effect, carries multiple active groups, has the characteristics of magnetic responsiveness as well as large specific surface area, porosity, narrow particle size distribution and the like of nanoparticles, and can move and separate rapidly under the action of an external magnetic field to realize the advantages of easiness in recycling, renewability and the like.

Description

technical field [0001] The invention relates to the technical field of biosorbent preparation, in particular to a magnetic nano-chitosan-loaded sheath bacterial composite biosorbent 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. Les...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/24B01J20/28B01J20/30
CPCB01J20/06B01J20/24B01J20/28009B01J2220/46B01J2220/4806B01J2220/4812B01J2220/4868
Inventor 郑虹邓加聪张晓榕吴晓梅
Owner FUQING BRANCH OF FUJIAN NORMAL UNIV
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