Magnetic nano-chitosan microspheres and preparation method thereof

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...

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.