Method for adsorbing lead ions in solution by nanocrystalline cellulose magnetic particles

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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  • 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 adsorbing lead ions in solution by nanocrystalline cellulose magnetic particles
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  • Method for adsorbing lead ions in solution by nanocrystalline cellulose magnetic particles

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Embodiment 1

[0026] A method for nanocrystalline cellulose magnetic particles to absorb lead ions in a solution, the method is to prepare nanocrystalline cellulose from microcrystalline cellulose, then prepare nanocrystalline cellulose magnetic particles through graft modification, and finally convert nanocrystalline cellulose to Magnetic particles are encapsulated in microcapsules to obtain a nanocrystalline cellulose magnetic particle adsorbent, and the adsorbent is used to adsorb lead ions in the solution.

[0027] The preparation method of nanocrystalline cellulose is to add microcrystalline cellulose and strongly acidic cation exchange resin to 1000mL deionized water at a mass ratio of 1:15, stir at 65°C, and ultrasonically treat for 1h at an ultrasonic frequency of 60KHz to catalyze hydrolysis. After the completion, the cation exchange resin was filtered out, and the cellulose sample was separated, and the cellulose sample was centrifuged at 15,000 r / min for 5 minutes, and the nanocry...

Embodiment 2

[0032] A method for nanocrystalline cellulose magnetic particles to absorb lead ions in a solution, the method is to prepare nanocrystalline cellulose from microcrystalline cellulose, then prepare nanocrystalline cellulose magnetic particles through graft modification, and finally convert nanocrystalline cellulose to Magnetic particles are encapsulated in microcapsules to obtain a nanocrystalline cellulose magnetic particle adsorbent, and the adsorbent is used to adsorb lead ions in the solution.

[0033] The preparation method of nanocrystalline cellulose is to add microcrystalline cellulose and strongly acidic cation exchange resin into 1000mL deionized water at a mass ratio of 1:18, stir at 68°C, and ultrasonically treat for 2 hours at an ultrasonic frequency of 70KHz to catalyze hydrolysis. After the completion, the cation exchange resin was filtered out, and the cellulose sample was separated, and the cellulose sample was centrifuged at 18,000 r / min for 7 minutes to obtain...

Embodiment 3

[0038] A method for nanocrystalline cellulose magnetic particles to absorb lead ions in a solution, the method is to prepare nanocrystalline cellulose from microcrystalline cellulose, then prepare nanocrystalline cellulose magnetic particles through graft modification, and finally convert nanocrystalline cellulose to Magnetic particles are encapsulated in microcapsules to obtain a nanocrystalline cellulose magnetic particle adsorbent, and the adsorbent is used to adsorb lead ions in the solution.

[0039] The preparation method of nanocrystalline cellulose is to add microcrystalline cellulose and strongly acidic cation exchange resin into 1000mL deionized water at a mass ratio of 1:20, stir at 70°C, and ultrasonically treat for 2.5h at an ultrasonic frequency of 80KHz to catalyze After the hydrolysis, the cation exchange resin was filtered out, and the cellulose sample was separated, and the cellulose sample was centrifuged at 20000r / min for 10min to obtain nanocrystalline cell...

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Abstract

The invention relates to a method for adsorbing lead ions in a solution by 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, finally, encapsulating the nanocrystalline cellulose magnetic particles by microcapsules so as to obtain a nanocrystalline cellulose magnetic particle adsorbent, and adsorbing the lead ions in the solution by using the adsorbent. 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 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 absorbing lead ions in a solution by nanocrystalline cellulose magnetic particles used 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 t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/26B01J20/28C02F1/28B01J20/30C02F101/20
CPCB01J20/0229B01J20/24B01J20/26B01J20/28009B01J2220/46C02F1/288C02F2101/20
Inventor 欧阳小琨金如娜杨立业王阳光王艳飞卢娇
Owner ZHEJIANG OCEAN UNIV
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