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A kind of mil-125(ti)/chitosan composite microspheres adsorbing arsenic

A MIL-125, composite microsphere technology, applied in the field of MIL-125/chitosan composite microspheres, can solve the problem of high cost of adsorbent, slow adsorption capacity and adsorption rate of adsorbent, poor reusability, etc. problem, to achieve the effect of fast adsorption rate, strong reusability and good dispersibility

Active Publication Date: 2020-07-14
ZHEJIANG OCEAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the adsorption capacity and adsorption rate of the adsorbent are slow, and the reusability is poor, resulting in high cost of use of the adsorbent.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] A kind of MIL-125 (Ti) / chitosan composite microspheres adsorbing arsenic, the weight ratio of modified chitosan and MIL-125 (Ti) in the composite microspheres is 1:0.8-1.2, the above-mentioned composite microspheres The diameter is 0.1-0.5mm.

[0015] A MIL-125(Ti) / chitosan composite microsphere for arsenic adsorption, the preparation method of which comprises the preparation of modified chitosan, the preparation of MIL-125(Ti) and the preparation of the composite microsphere, specifically comprising the following steps:

[0016] 1) Preparation of modified chitosan: Dissolve ferric chloride in deionized water according to the ratio of material to liquid at 1:13-16 (g / mL). After fully dissolved, add chitosan, ferric chloride and shell The weight ratio of polysaccharides is 1:1.1-1.2, magnetically stirred for 3-5 hours, after the reaction is over, slowly add absolute ethanol with 1.8-2.2 times the volume of deionized water, stir slowly, and centrifuge after the precipitat...

Embodiment 2

[0020] A kind of MIL-125(Ti) / chitosan composite microspheres adsorbing arsenic, the weight ratio of modified chitosan and MIL-125(Ti) in composite microspheres is 1:1.2, and the diameter of above-mentioned composite microspheres is in 0.1-0.5mm.

[0021] A MIL-125(Ti) / chitosan composite microsphere for arsenic adsorption, the preparation method of which comprises the preparation of modified chitosan, the preparation of MIL-125(Ti) and the preparation of the composite microsphere, specifically comprising the following steps:

[0022] 1) Preparation of modified chitosan: Dissolve ferric chloride in deionized water according to the material-to-liquid ratio of 1:16 (g / mL), and add chitosan, ferric chloride and chitosan after fully dissolved The weight ratio is 1:1.2, magnetically stirred for 3 hours, after the reaction, slowly add absolute ethanol with 1.8 times the volume of deionized water, stir slowly, after the precipitate is gradually formed, centrifuge, and then wash the pre...

Embodiment 3

[0026] A kind of MIL-125(Ti) / chitosan composite microspheres adsorbing arsenic, the weight ratio of modified chitosan and MIL-125(Ti) in composite microspheres is 1:1, and the diameter of above-mentioned composite microspheres is in 0.1-0.5mm.

[0027] A MIL-125(Ti) / chitosan composite microsphere for arsenic adsorption, the preparation method of which comprises the preparation of modified chitosan, the preparation of MIL-125(Ti) and the preparation of the composite microsphere, specifically comprising the following steps:

[0028] 1) Preparation of modified chitosan: Dissolve ferric chloride in deionized water according to the material-to-liquid ratio of 1:14.3 (g / mL), and add chitosan, ferric chloride and chitosan after fully dissolved The weight ratio is 1:1.14, magnetically stirred for 4 hours, after the reaction is over, slowly add absolute ethanol with 2.0 times the volume of deionized water, stir slowly, after the precipitate is gradually formed, centrifuge, and then was...

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Abstract

The invention discloses MIL-125(Ti) / chitosan composite microspheres for arsenic adsorption. The weight ratio of modified chitosan to MIL-12(Ti) in the composite microspheres is 1:(0.8-1.2). A preparation method of the composite microspheres comprises the following steps: adopting ferric trichloride to modify chitosan, then performing a cross-linking reaction with glutaraldehyde, and performing cleaning, drying and grinding to obtain modified chitosan; uniformly mixing tetrabutyl titanate, terephthalic acid, N,N-dimethylformamide and methyl alcohol, and performing a reaction in a high-pressurereactor to obtain MIL-12(Ti); and dissolving MIL-12(Ti) in deionized water, adding chitosan after dissolution, performing stirring, then dripping the mixture into a sodium tripolyphosphate solution, and performing stirring and curing to obtain composite microspheres. The MIL-125(Ti) / chitosan composite microspheres for arsenic adsorption has the following beneficial effects: the composite microspheres have favorable dispersibility and regular sphericity, has high adsorption capacity and adsorption rate, and is strong in arsenic adsorption capability and reusability.

Description

technical field [0001] The invention relates to the technical field of adsorption separation, in particular to a MIL-125(Ti) / chitosan composite microsphere for arsenic adsorption. Background technique [0002] Arsenic is a gray and lustrous chemical element with non-metallic and metallic properties. Its content in the earth's crust is about 3mg / kg, and its abundance in nature ranks twentieth, and it exists widely in nature. With mining, metallurgy, various pesticides, arsenate drugs and other human activities and geochemical evolution, arsenic metal has entered the environment in large quantities. Due to its toxicity and certain properties similar to heavy metal elements, it is often combined with other harmful elements in different systems. Elements coexist, so it has a strong harmful effect in the environment. Generally speaking, arsenic poisoning is caused by people's poisoning through food, air, and especially water containing arsenic. Arsenic pollution treatment is pa...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J20/24B01J20/28B01J20/30C02F1/28C08B37/08C08G83/00
CPCB01J20/24B01J20/28009B01J20/28021B01J20/3085C02F1/286C02F2101/103C08B37/003C08G83/008
Inventor 郁迪王南欧阳小琨梁雪雪杨立业蓝浩龚戬芳
Owner ZHEJIANG OCEAN UNIV
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