Magnetic polydopamine/carboxymethyl chitosan adsorbent and preparation method and application thereof

A technology of carboxymethyl chitosan and polydopamine, applied in chemical instruments and methods, adsorbed water/sewage treatment, other chemical processes, etc., can solve the problems of high operating cost, secondary pollution, high energy demand, etc. The effect of easy separation, simple preparation method and wide range of sources

Inactive Publication Date: 2019-10-15
中科广化(重庆)新材料研究院有限公司 +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In the past decades, various techniques have been developed, such as traditional methods such as chemical oxidation, flocculation-coagulation, precipitation, photocatalytic degradation, and membrane filtration, although these methods have achieved some results in dye removal, but These feasible methods also have their inherent limitations, such as high energy requirements, high operating costs and secondary pollution, etc.

Method used

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  • Magnetic polydopamine/carboxymethyl chitosan adsorbent and preparation method and application thereof
  • Magnetic polydopamine/carboxymethyl chitosan adsorbent and preparation method and application thereof
  • Magnetic polydopamine/carboxymethyl chitosan adsorbent and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0060] (1) Synthesis of ferric oxide: Add 25.0 g of ferric chloride hexahydrate and 15.0 g of ferrous sulfate tetrahydrate into a four-necked flask, then add 50 mL of deionized water, ultrasonically until dissolved, and then condense Nitrogen protection was passed under the device. After heating to 80°C, add 50mL ammonia water to react for 3 hours, cool to room temperature, wash with deionized water and absolute ethanol until neutral, collect with permanent magnet, and dry in a vacuum oven at 60°C to constant weight, the magnetic ferric oxide nanoparticles are obtained.

[0061] (2) Synthesis of magnetic polydopamine nanoparticles: Weigh 0.4g of magnetic ferric iron tetroxide nanoparticles synthesized in step (1) and add them to 200mL Tris-HCl buffer solution containing dopamine, wherein dopamine is in Tris-HCl buffer solution The concentration is 2.0mg / mL, sonication for 15 minutes, after 24 hours of reaction at room temperature with a stirring speed of 500rmp, use a permanen...

Embodiment 2

[0068] (1) Synthesis of ferric oxide: Add 25.0 g of ferric chloride hexahydrate and 15.0 g of ferrous sulfate tetrahydrate into a four-necked flask, then add 50 mL of deionized water, ultrasonically until dissolved, and then condense Nitrogen protection was passed under the device. After heating to 80°C, add 50mL ammonia water to react for 3 hours, cool to room temperature, wash with deionized water and absolute ethanol until neutral, collect with permanent magnet, and dry in a vacuum oven at 60°C to constant weight, the magnetic ferric oxide nanoparticles are obtained.

[0069] (2) Synthesis of Magnetic Polydopamine / Carboxymethyl Chitosan Adsorbent: Weigh 0.80g carboxymethyl chitosan, 0.4g dopamine and dissolve them in 200mL Tris-HCl buffer solution, then add in step (1) to prepare 0.40g of magnetic iron ferric oxide nanoparticles, ultrasonic 15 minutes, after 12 hours reaction at room temperature with 500rmp stirring speed, then add 12.8mL volume concentration and be 25% glu...

Embodiment 3

[0071] Take respectively the magnetic polydopamine / carboxymethyl chitosan adsorbent in 20mg embodiment 1, embodiment 2 and the magnetic carboxymethyl chitosan adsorbent in comparative example 1 and join in 25mL methylene blue aqueous solution, in the same Shaking speed (180rpm), adsorption time (60min), same adsorption temperature (25°C), same initial concentration (250mg / L) methylene blue aqueous solution and different pH (6, 7, 8, 9, 10 and 11, respectively) Adsorb the methylene blue aqueous solution, measure the absorbance of the methylene blue aqueous solution after the adsorption, and calculate the maximum adsorption capacity. The results show that when the pH=10 of the methylene blue aqueous solution, the magnetic adsorbent of Comparative Example 1 and Example 1 and Example 2 has a certain effect on the methylene blue aqueous solution. The maximum adsorption capacity of 135.6mg / g, 205.3mg / g, 193.4mg / g respectively.

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Abstract

The invention discloses a magnetic polydopamine / carboxymethyl chitosan adsorbent and a preparation method and application thereof. The method comprises the following steps: reacting carboxymethyl chitosan, dopamine and magnetic ferroferric oxide nanoparticles, and then adding a crosslinking agent for reaction; or first reacting the dopamine and the magnetic ferroferric oxide nanoparticles, then adding the carboxymethyl chitosan and the crosslinking agent for reaction; preparing the magnetic polydopamine / carboxymethyl chitosan adsorbent, wherein the magnetic ferroferric oxide nanoparticles areprepared by a coprecipitation method. The magnetic adsorbent prepared by the method has higher adsorption performance on a cationic dye aqueous solution, has large adsorption capacity on a cationic dye aqueous solution, and simultaneously has high-efficiency recycling capability.

Description

technical field [0001] The invention belongs to the field of polymer materials, and in particular relates to a magnetic polydopamine / carboxymethyl chitosan adsorbent and a preparation method and application thereof. Background technique [0002] With the rapid development of industrialization and urbanization, water pollution has become the focus of widespread attention. Water pollution mainly includes heavy metal ions and dye pollution, among which dye pollution mainly comes from textile, leather, plastic, paper, cosmetics and other manufacturing industries. . Due to the complex aromatic structure of most dyes, these dyes are stable in structure and not easy to degrade, so most dyes can exist in the natural environment for a long time and accumulate to high concentrations, thus posing a huge threat to the ecological environment and human health. Studies have shown that dyes can cause direct damage to the human liver, digestive system and central nervous system. Therefore,...

Claims

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Application Information

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IPC IPC(8): B01J20/26B01J20/28B01J20/30C02F1/28C02F101/30
CPCB01J20/06B01J20/24B01J20/262B01J20/28009C02F1/285C02F1/286C02F1/288C02F2101/308
Inventor 王斌雷春艳
Owner 中科广化(重庆)新材料研究院有限公司
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