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A kind of preparation method of nanocrystalline cellulose magnetic particle

A nanocrystalline cellulose, magnetic particle technology, applied in chemical instruments and methods, other chemical processes, water/sludge/sewage treatment, etc., can solve the problem of low adsorption capacity, affecting adsorption selectivity and adsorption capacity, and not suitable for range and other issues, to achieve the effect of large adsorption capacity, low cost and good effect

Active Publication Date: 2019-03-26
ZHEJIANG OCEAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

From the perspective of the microstructure of natural lignocellulose, its molecular arrangement is directional and has the characteristics of crystals (called cellulose crystallization regions). Lignocellulose is often formed by covalent bonds with other macromolecules in plant tissues. Lignin-carbohydrate complexes, these microstructures may affect the adsorption capacity and adsorption selectivity in two aspects: (1) the existence of crystallized regions limits the diffusion of metal ions in solution to the inside of lignocellulose particles, and the crystallized regions also It will shield part of the active adsorption groups, resulting in low adsorption capacity; (2) Due to the existence of lignin-carbohydrate complexes, the surface area, pore volume, average pore radius and pore size distribution of lignocellulose particles are not in the appropriate range, Affects adsorption selectivity and adsorption capacity

Method used

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  • A kind of preparation method of nanocrystalline cellulose magnetic particle
  • A kind of preparation method of nanocrystalline cellulose magnetic particle
  • A kind of preparation method of nanocrystalline cellulose magnetic particle

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Embodiment 1

[0025] A method for preparing nanocrystalline cellulose magnetic particles, the preparation method is to prepare nanocrystalline cellulose from microcrystalline cellulose, then prepare semi-finished products of nanocrystalline cellulose magnetic particles through graft modification, and finally prepare nanocrystalline cellulose magnetic particles Wrapped in microcapsules to obtain nanocrystalline cellulose magnetic particles.

[0026] The preparation method of microcrystalline cellulose to prepare nanocrystalline cellulose is: 6gMCC plus 200mL of 2mol / L ammonium persulfate solution, mix well, soak for a period of time, place in an ultrasonic 70KHz reactor, stir and react at 60°C, after the reaction To obtain a suspension, place the suspension in a high-speed centrifuge at 9000r / min for repeated centrifugation and washing to near neutrality, dissolve the prepared colloidal substance with 200mL1mol / L citric acid solution, and continue to stir and react in an ultrasonic reactor at...

Embodiment 2

[0031]A method for preparing nanocrystalline cellulose magnetic particles, the preparation method is to prepare nanocrystalline cellulose from microcrystalline cellulose, then prepare semi-finished products of nanocrystalline cellulose magnetic particles through graft modification, and finally prepare nanocrystalline cellulose magnetic particles Wrapped in microcapsules to obtain nanocrystalline cellulose magnetic particles.

[0032] The preparation method of microcrystalline cellulose to prepare nanocrystalline cellulose is: 6gMCC plus 200mL of 2mol / L ammonium persulfate solution, mix well, soak for a period of time, place in an ultrasonic 80KHz reactor, stir and react at 60°C, after the reaction To obtain a suspension, place the suspension in a high-speed centrifuge at 9000r / min for repeated centrifugation and washing to near neutrality, dissolve the prepared colloidal substance with 200mL1mol / L citric acid solution, and continue to stir and react in an ultrasonic reactor at ...

Embodiment 3

[0037] A method for preparing nanocrystalline cellulose magnetic particles, the preparation method is to prepare nanocrystalline cellulose from microcrystalline cellulose, then prepare semi-finished products of nanocrystalline cellulose magnetic particles through graft modification, and finally prepare nanocrystalline cellulose magnetic particles Wrapped in microcapsules to obtain nanocrystalline cellulose magnetic particles.

[0038] The preparation method of microcrystalline cellulose to prepare nanocrystalline cellulose is: 6gMCC plus 200mL of 2mol / L ammonium persulfate solution, mix well, soak for a period of time, place in an ultrasonic 90KHz reactor, stir and react at 60°C, after the reaction To obtain a suspension, place the suspension in a high-speed centrifuge at 9000r / min for repeated centrifugation and washing to near neutrality, dissolve the prepared colloidal substance with 200mL1mol / L citric acid solution, and continue to stir and react in an ultrasonic reactor at...

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Abstract

The invention relates to a method for preparing nanocrystalline cellulose magnetic particles. The method comprises the steps of preparing nanocrystalline cellulose from microcrystalline cellulose, then, preparing nanocrystalline cellulose magnetic particles through grafting modification, and finally, encapsulating the nanocrystalline cellulose magnetic particles by microcapsules, thereby obtaining the nanocrystalline cellulose magnetic particles. The method has the characteristics of extensive raw materials and low cost, and the prepared adsorbent is environment-friendly and pollution-free, can be used for adsorbing a variety of heavy metals such as lead, chromium and copper in sewage, is high in adsorption capacity and good in effect and has regeneration capacity.

Description

technical field [0001] The invention relates to the field of nanocrystalline cellulose composite materials, in particular to a method for preparing nanocrystalline cellulose magnetic particles for adsorbing heavy metal ions in sewage. Background technique [0002] With the development of modern economy and the development and utilization of marine resources in the offshore area, a large amount of waste water and domestic sewage containing heavy metal ions are discharged into the sea, the heavy metal pollution in marine water has increased sharply, and the ecological environment has also suffered great damage. Heavy metal ions can be enriched and accumulated through the food chain. A large number of studies have shown that the heavy metal content of fish in seawater has seriously exceeded the standard. [0003] Heavy metals have certain toxicity. For example, cadmium, when the environment is polluted, cadmium can enter the human body through the food chain to enrich, destroy...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J20/24B01J20/28B01J20/30C02F1/28C02F101/20C02F101/22
CPCB01J20/24B01J20/28009C02F1/286C02F2101/20C02F2101/22
Inventor 欧阳小琨金如娜杨立业刘超王南
Owner ZHEJIANG OCEAN UNIV
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