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Enhanced magnetic adsorbent

A magnetic adsorbent, enhanced technology, applied in adsorption water/sewage treatment, other chemical processes, special treatment targets, etc., can solve the problems of less chitosan after cross-linking, poor dye adsorption performance, etc., and achieve grafting. High efficiency, good adsorption effect, and the effect of reducing adsorption cost

Active Publication Date: 2021-01-05
CHONGQING UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In view of the above-mentioned deficiencies in the prior art, the purpose of the present invention is to solve the problems that the existing magnetic chitosan adsorbent has a small amount of chitosan after crosslinking and poor adsorption performance to dyes, and provides an enhanced magnetic adsorption agent

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] An enhanced magnetic adsorbent is prepared through the following steps:

[0028] S1, preparation of Fe 3 o 4 @SiO 2 Nanoparticles (FS): 1.2 g Fe 3 o 4 Add magnetic nanoparticles into 600 mL ethanol, ultrasonically disperse for 10–15 min, then add 13 mL ammonia solution and 200 mL distilled water into a 1000 mL glass beaker, ultrasonically disperse for 40 min, then add 6 mL TEOS dropwise, and Stir for 8 h; after the reaction, wash with ethanol and distilled water for 3 times, pour into an evaporating dish, and dry in vacuum for 4 h to obtain SiO 2 Coated Fe 3 o 4 magnetic nanoparticles.

[0029] S2. Preparation of magnetic chitosan microspheres (FSC): First, 7.5 g chitosan was dissolved in 200 mL of 1% acetic acid solution to prepare a chitosan solution with a mass fraction of 3.75%, and stirred for 1 h. Add 3.5 g of Fe obtained in step S1 to the above chitosan solution 3 o 4 @SiO 2 Nanoparticles were stirred to obtain a suspension, which was dispersed in a mi...

Embodiment 2

[0033] The difference between the preparation method in this example and Example 1 is that the mass of initiator VA-044 in step S3 is 0.0275 g, and the volume of AO monomer is 5 mL. The obtained enhanced magnetic adsorbent is denoted as PFSC1.

Embodiment 3

[0035] The difference between the preparation method in this example and Example 1 is that the mass of initiator VA-044 in step S3 is 0.0775 g, and the volume of AO is 15 mL. The obtained enhanced magnetic adsorbent is denoted as PFSC3.

[0036] 2. Adsorption performance test.

[0037] 1. The effect of dosage on the removal of dye.

[0038] Prepare 1000mg / L orange II (OG), 1000mg / L acid red 88 (AE) and 800mg / L amaranth (RM) solutions, and adjust the pH of the solution to 7.0. Take 25 mL of each solution in the Erlenmeyer flask, and conduct three parallel experiments. One group is added with PFSC adsorbent material, the other group is added with PFSC1 adsorbent material, and the third group is added with PFSC3 adsorbent material. The dosage of adsorbent is 0.25 g / L , 0.5 g / L , 0.75 g / L , 1.0. g / L , 1.25 g / L , 1.5 g / L, put the Erlenmeyer flask in a constant temperature water bath shaking box at 25 ° C, and measure it in the Erlenmeyer flask after 24 hours solution...

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Abstract

The invention discloses an enhanced magnetic adsorbent, which is prepared by the following steps: S1, adding Fe3O4 magnetic nanoparticles into an ethanol solution, carrying out ultrasonic dispersion,adding an ammonia water solution and distilled water, carrying out ultrasonic dispersion, and dropwisely adding TEOS to obtain Fe3O4@SiO2, S2, dissolving chitosan in acetic acid to obtain a chitosan solution, adding Fe3O4@SiO2 nanoparticles, stirring to obtain a suspension, dispersing the suspension in a mixed solution of cyclohexane and span80, and dropwise adding a glutaraldehyde solution to obtain a magnetic chitosan microsphere solution, and S3, adding an initiator VA-044, uniformly mixing, adding a cationic monomer, sealing, and initiating copolymerization under ultraviolet light to obtain the enhanced magnetic adsorbent. The adsorption performance of the chitosan magnetic microspheres can be improved, the chitosan magnetic microspheres can be repeatedly used, and the adsorption costis reduced.

Description

technical field [0001] The invention relates to the field of dye wastewater treatment, in particular to an enhanced magnetic adsorbent. Background technique [0002] Dyes are widely used in food, clothing, decoration and other industries. Due to their toxicity, mutagenicity, and serious pollution of water environment and ecosystems, especially azo dyes will transform various carcinogens under certain conditions, which is harmful to human health. The treatment of dye wastewater has become an urgent problem to be solved. Adsorption is the most popular and commonly used method to remove various dyes, metals and drugs, and has the advantages of simple operation and low energy consumption. Therefore, in recent years, the development of new adsorbents for dye decolorization has become a hot spot of many studies. Commonly used adsorbents include activated carbon, resins, silicon, graphene, and zeolites. However, these adsorbents are limited due to low adsorption efficiency and po...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/24B01J20/28B01J20/30C02F1/28C02F101/30C02F101/38
CPCB01J20/24B01J20/28009C02F1/286C02F2101/308C02F2101/38C02F2303/16
Inventor 丁魏韩亚文郑怀礼刘永芝吴沁真熊子康
Owner CHONGQING UNIV
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