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Preparation and application of nano mesoporous Fe3O4-chitosan core-shell crosslinked microsphere material

A technology of chitosan core-shell and cross-linked microspheres, applied in other chemical processes, chemical instruments and methods, water/sludge/sewage treatment, etc., can solve problems such as dissolution, difficult separation, and loss of adsorption materials, and achieve The operating conditions are easy to control, the particle size is small, and the effect of high dispersion

Active Publication Date: 2019-06-14
HUNAN CITY UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Nano-adsorbents have the advantages of high specific surface area and large adsorption capacity, but nano-adsorbed particles are difficult to separate from the solution due to their small particle size. When the acidity of waste liquid is high, it is easy to cause the dissolution of metal oxide adsorbents, and it is easy to separate solids and liquids. loss of adsorbent material

Method used

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  • Preparation and application of nano mesoporous Fe3O4-chitosan core-shell crosslinked microsphere material
  • Preparation and application of nano mesoporous Fe3O4-chitosan core-shell crosslinked microsphere material
  • Preparation and application of nano mesoporous Fe3O4-chitosan core-shell crosslinked microsphere material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Implementation Example 1: Synthesis of magnetic iron.

[0033] 0.488g FeCl 3 Mix well with 1.5g sodium citrate and dissolve in 100mL ethylene glycol. Then add 6.0g of sodium acetate and stir for 30min, transfer the mixture into a 100mL autoclave lined with polytetrafluoroethylene anti-corrosion material, seal, heat to 200 ℃, and maintain the reaction for 10h; after the reaction, cool to room temperature and collect with a magnet black Fe 3 O 4 Powder, rinse with ethanol and deionized water successively. The obtained nano Fe 3 O 4 SEM and TEM analysis of powder such as figure 2 shown in Figures A1 and A2.

Embodiment 2

[0034] Example 2: Synthesis of mesoporous nanomagnetic iron.

[0035] Mix 1.5g of chitosan solution with ethanol, and then add 0.488g of FeCl 3 Add to the mixed solution, ultrasonically disperse for 15 min, add sodium acetate, stir evenly to form a uniform mixed solution; transfer the above mixed solution into a high-pressure hydrothermal reactor, and carry out a high solvothermal reaction at a temperature of 190-200 °C. After the reaction is completed, the temperature in the kettle is cooled to room temperature by circulating cooling water, and the solid black product in the mixed solution is collected with magnetic iron, washed with ethylene glycol, and dried to obtain mesoporous Fe. 3 O 4 Microspheres; obtained nano Fe 3 O 4 SEM and TEM analysis of powders such as figure 2 shown in Figures B1 and B2.

Embodiment 3

[0036] Example 3: Synthesis of mesoporous magnetic iron.

[0037] Dissolve 0.5g of chitosan in 20mL of 3% acetic acid mixture, and dissolve 0.2g of nano-Fe 3 O 4 Add the mixed solution of chitosan and acetic acid and stir evenly; ultrasonically disperse the mixed solution for 15 min, add 1 mL of chlorohydrin cross-linking agent, stir evenly, transfer the mixed solution to a 10 mL glass needle syringe, and drop the mixture into the container at a rate of 1 mL / min. 0.25M (25°C) NaOH solution with constant magnetic stirring at 400rpm until precipitated particles formed. The precipitated particles were left to stand in the NaOH solution for 12 h. The solid-liquid was separated, and the solid was dried overnight in an atmosphere oven at 50°C. The obtained solid powder was washed with 10 mL of 0.1 M HCl for 4 h to remove unreacted chitosan, then washed with deionized water, and dried in vacuum for 2 h to obtain nano-mesoporous Fe. 3 O 4 - Chitosan core-shell cross-linked micros...

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Abstract

The invention discloses preparation and application of a nano mesoporous Fe3O4-chitosan core-shell cross-linked microsphere material, and belongs to the field of preparation and water treatment research and application of nano mesoporous Fe3O4-chitosan core-shell cross-linked microspheres. Based on controllable synthesis of mesoporous Fe3O4 microspheres, chitosan is used as a synthesis process regulating agent and a stable matrix for the first time, chloroethanol is used as a cross-linking agent, ferric trichloride, ethylene glycol and sodium acetate are used as reaction raw materials and auxiliary materials, through regulation and control of the growth and cross-linking of nanoparticles, the improvement of the porosity of the nanoparticles, the increase of the specific surface area and the effective crosslinking of the particles are realized. The particle size of the obtained cross-linked microsphere is 200-450 nm, the specific surface area is 6.2 m<2> / g, the pore size is about 7 nm,the particle size distribution is narrow, the cross-linked microsphere has high magnetism (40-85 emu / g), cross-linked chitosan provides a strong matrix, and the physical stability of the cross-linkedmicrosphere is enhanced.

Description

technical field [0001] The invention belongs to nano mesoporous Fe 3 o 4 -The synthesis of chitosan core-shell cross-linked microsphere materials and the treatment of antimony-containing wastewater, involving multi-step, adjustable synthesis of Fe with nano-mesoporous core-shell cross-linked structure 3 o 4 The method of the microsphere material and its application method in the treatment of antimony-containing water body and antimony-containing industrial wastewater. Background technique [0002] At present, the existing technologies commonly used in the industry are as follows: [0003] Antimony is a carcinogenic and accumulative heavy metal, which has been listed as a priority heavy metal by the US Environmental Protection Agency and the European Union. Antimony diffuses into the environment and enters water, soil and other environmental media in different forms after chemical or biological transformation, and can migrate long distances, causing continuous harm to the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/24B01J20/28B01J20/30C02F1/28C02F101/20
Inventor 张纯汪爱河蒋海燕邓玉梅
Owner HUNAN CITY UNIV
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