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Preparation and application of magnetic separation technique-based amphoteric carboxymethyl chitosan-based microspheres

A technology of carboxymethyl chitosan and carboxymethyl chitosan, which is applied in the field of preparation of amphoteric carboxymethyl chitosan microspheres, can solve the difficulties of separation and recovery, limited amino group content, and negative heavy metal ion removal effect Unsatisfactory problems, etc., to achieve the effect of increasing adsorption capacity, efficient separation and recovery, and saving economic costs

Inactive Publication Date: 2020-11-24
CHONGQING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although CCS itself is an amphoteric polymer, the content of amino groups on it is limited, and the removal effect on negative heavy metal ions is not ideal, so enhancing the number of amino groups in CCS has become one of the directions of modification
In addition, the separation and recovery of CCS is difficult, and magnetic separation technology is expected to solve this problem

Method used

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  • Preparation and application of magnetic separation technique-based amphoteric carboxymethyl chitosan-based microspheres
  • Preparation and application of magnetic separation technique-based amphoteric carboxymethyl chitosan-based microspheres
  • Preparation and application of magnetic separation technique-based amphoteric carboxymethyl chitosan-based microspheres

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Effect test

Embodiment 1

[0024] One, the preparation method of the amphoteric carboxymethyl chitosan based microsphere based on magnetic separation technology, comprises the steps:

[0025] 1) Magnetic carboxymethyl chitosan microspheres (Fe 3 o 4 Preparation of @CCS)

[0026] 0.8g carboxymethyl chitosan (CCS) powder was dissolved in 20mL ultrapure water to make carboxymethyl chitosan suspension and then weighed 0.6g Fe 3 o 4 Nanoparticles were dispersed in 5 mL ultrapure water, and after ultrasonic treatment for 20 min, they were further mixed with carboxymethyl chitosan suspension to form carboxymethyl chitosan-Fe 3 o 4 The solution was mixed and stirred for 4h.

[0027] After mixing 125mL cyclohexane and 2mL Span 80 in a three-necked flask and stirring until the mixture became a paste, the carboxymethyl chitosan-Fe 3 o 4 The mixed solution was dropped dropwise into the three-neck flask under vigorous stirring, and after stirring for 40 min, the temperature was raised to 50°C, and 1.3 mL of g...

Embodiment 2

[0050] 1. Preparation of amphoteric carboxymethyl chitosan-based microspheres based on magnetic separation technology:

[0051] The difference between the preparation method of the amphoteric carboxymethyl chitosan-based microspheres based on magnetic separation technology and Example 1 in this embodiment is that the initiator in step 2) is ammonium persulfate of 0.033g / mL, and the addition amount is 8mL , the addition of methacryloyloxyethyltrimethylammonium chloride was 5mL, and other conditions were the same as in Example 1.

[0052] 2. Application of amphoteric carboxymethyl chitosan-based microspheres in binary hybrid system based on magnetic separation technology

[0053] This experiment is to explore the practical application of adsorbents on the adsorption of metal ions. It is divided into two groups, numbered A and B. Among them, group A uses laboratory tap water to prepare metal ion solutions, and group B uses water from Minzhu Lake of Chongqing University to prepare...

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Abstract

The invention discloses a preparation method of magnetic separation technique-based amphoteric carboxymethyl chitosan-based microspheres. The preparation method comprises the steps of: dispersing carboxymethyl chitosan and Fe3O4 nano-particles into water to form a carboxymethyl chitosan-Fe3O4 mixed solution, adding the mixed solution into a cyclohexane-Span 80 system, adding a glutaraldehyde solution and mixing the solution evenly to prepare magnetic carboxymethyl chitosan microspheres; and dispersing the microspheres into water, adding [2-(methacryloyloxy)ethyl]trimethylammonium chloride under an initiation condition of an initiator to prepare magnetic separation technique-based amphoteric carboxymethyl chitosan-based microspheres. The magnetic separation technique-based amphoteric carboxymethyl chitosan-based microspheres prepared by the method contain abundant quaternary ammonium groups, amino, hydroxy, carboxyl and the like, so that an adsorbent has an amphoteric character, can efficiently remove heavy metal cations, can also efficiently remove heavy metal anions, can be applied to a mixed system of the heavy metal cations and the heavy metal anions, and efficiently removes heavy metal ions in a mixed solution at the same time. The adsorbent can be recovered from the solution through a magnetic separation technique after adsorption is completed, and regeneration and utilization can be achieved after desorption, so that the economic cost is greatly reduced.

Description

technical field [0001] The invention belongs to the field of preparation of water treatment materials, in particular to a preparation method and application method of amphoteric carboxymethyl chitosan-based microspheres based on magnetic separation technology. Background technique [0002] Heavy metal wastewater will not only cause harm to the environment, but also cause a variety of diseases in animals and humans, and damage the health of living organisms. Cr(Ⅵ) will increase the incidence of respiratory cancer, damage the liver and kidney, stimulate and corrode the skin, and seriously damage human health. Excessive copper can cause symptoms such as vomiting, nausea, and abdominal pain, as well as respiratory diseases, liver and kidney failure, and gastrointestinal bleeding, which are extremely harmful to the human body. Untreated industrial wastewater will release a large amount of heavy metal ions, so it is necessary to treat wastewater with heavy metal ions. [0003] A...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/26B01J20/28B01J20/30C02F1/28C02F101/20C02F101/22
CPCB01J20/06B01J20/24B01J20/265B01J20/28009B01J20/28011B01J20/28021C02F1/288C02F2101/20C02F2101/22
Inventor 郑怀礼万鑫源钟政蒋君怡王永娟包兵熊子康
Owner CHONGQING UNIV
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