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Method for preparing nanocrystalline cellulose magnetic particle adsorbent

A technology of nanocrystalline cellulose and magnetic particles, applied in chemical instruments and methods, adsorption water/sewage treatment, alkali metal oxides/hydroxides, etc., can solve the problem of low adsorption capacity, affecting adsorption selectivity and adsorption capacity, etc. problem, to achieve the effect of large adsorption capacity, low cost and good effect

Active Publication Date: 2016-08-31
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 crystallization regions limits the diffusion of metal ions in solution to the inside of lignocellulose adsorbent particles, and the crystallization (2) Due to the presence of lignin-carbohydrate complexes, the surface area, pore volume, average pore radius and pore size distribution of lignocellulose adsorbent particles are not in the same range. Appropriate range affects adsorption selectivity and adsorption capacity

Method used

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  • Method for preparing nanocrystalline cellulose magnetic particle adsorbent
  • Method for preparing nanocrystalline cellulose magnetic particle adsorbent
  • Method for preparing nanocrystalline cellulose magnetic particle adsorbent

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Embodiment 1

[0026] A preparation method of nanocrystalline cellulose magnetic particle adsorbent, the preparation method is to prepare nanocrystalline cellulose from microcrystalline cellulose, then prepare nanocrystalline cellulose magnetic particles through graft modification, and finally make nanocrystalline cellulose magnetic The particles are wrapped in microcapsules to obtain the nanocrystalline cellulose magnetic particle adsorbent.

[0027] 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 ...

Embodiment 2

[0032] A preparation method of nanocrystalline cellulose magnetic particle adsorbent, the preparation method is to prepare nanocrystalline cellulose from microcrystalline cellulose, then prepare nanocrystalline cellulose magnetic particles through graft modification, and finally make nanocrystalline cellulose magnetic The particles are wrapped in microcapsules to obtain the nanocrystalline cellulose magnetic particle adsorbent.

[0033] 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 ...

Embodiment 3

[0038] A preparation method of nanocrystalline cellulose magnetic particle adsorbent, the preparation method is to prepare nanocrystalline cellulose from microcrystalline cellulose, then prepare nanocrystalline cellulose magnetic particles through graft modification, and finally make nanocrystalline cellulose magnetic The particles are wrapped in microcapsules to obtain the nanocrystalline cellulose magnetic particle adsorbent.

[0039] 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 ...

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Abstract

The invention relates to a method for preparing a nanocrystalline cellulose magnetic particle adsorbent. 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 particle adsorbent. According to the method, the nanocrystalline cellulose magnetic particle adsorbent is prepared through preparing the nanocrystalline cellulose from the microcrystalline cellulose, then, preparing the nanocrystalline cellulose magnetic particles through grafting modification, and finally, encapsulating the nanocrystalline cellulose magnetic particles by the microcapsules. 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 preparation method of a nanocrystalline cellulose magnetic particle adsorbent 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 enr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/26B01J20/30B01J20/28C02F1/28C02F101/20
CPCB01J20/0229B01J20/22B01J20/24B01J20/26B01J20/28009B01J20/28016C02F1/288C02F2101/20
Inventor 欧阳小琨金如娜杨立业刘超王南
Owner ZHEJIANG OCEAN UNIV
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