Preparation method of magnetic chitosan and method for adsorbing tannic acid in water

A technology of chitosan and tannic acid, applied in the direction of adsorption water/sewage treatment, chemical instruments and methods, water/sewage treatment, etc., can solve the problem of difficult separation of adsorbent and treated water, and achieve good economic and environmental benefits , good application prospects and low cost

Active Publication Date: 2014-09-03
TIANXINFU (BEIJING) MEDICAL APPLIANCE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These adsorbents have a relatively good adsorption effect on tannic acid, and have the advantages of low cost and easy operation, but they all have the disadvantage of being difficult to separate the adsorbent from the treated water.

Method used

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Examples

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Effect test

preparation example Construction

[0025] The preparation method of magnetic chitosan of the present invention specifically implements according to the following steps:

[0026] Step 1, sodium acetate and FeCl 3 ·6H 2 O dissolved in ethylene glycol (Fe 3+ The molar ratio with sodium acetate is 1:9, Fe 3+ The concentration is 0.1mol / L), magnetically stirred for 30-40min, then transferred to a hydrothermal reaction kettle for 10-15h at 180°C-200°C, cooled to room temperature after the reaction, and deionized water Fe 3 o 4 The nanoparticles are fully washed, then washed three times with absolute ethanol, and vacuum-dried at 45°C to 55°C for 12 hours to obtain magnetic ferric iron tetroxide;

[0027] Step 2, ultrasonically disperse the magnetic iron ferric oxide obtained in step 1, then add it to a mixed solution composed of absolute ethanol and deionized water in a volume ratio of 4:1, then add ammonia water to adjust the pH to 11 2 Under protection, mechanically stir and heat to 50-55°C, then add tetraethy...

Embodiment 1

[0035] Magnetic chitosan (Fe 3 o 4 / SiO 2 / Cs) preparation

[0036] Step 1, weigh 2.7g FeCl respectively 3 ·6H 2 O and 7.2g of sodium acetate were mixed and dissolved in 100ml of ethylene glycol, magnetically stirred for 30min to form a homogeneous yellow solution, then transferred to a hydrothermal reaction kettle, reacted at 190°C for 12h, cooled to room temperature, discarded the supernatant, and removed the bottom black The precipitate was fully rinsed with deionized water, then rinsed three times with absolute ethanol, and dried in a vacuum oven at 50°C for 12 hours to obtain magnetic ferric iron tetroxide;

[0037] Step 2: Add 1.0 g of ultrasonically dispersed magnetic ferric iron tetroxide to a mixed solution composed of 320 mL of absolute ethanol and 80 mL of deionized water, adjust the pH to 11 with ammonia water, and 2 Under protection, mechanically stir and heat to 50°C, add 2 mL of tetraethyl orthosilicate dropwise to the mixed solution, continue to stir for 1...

Embodiment 2

[0040] Magnetic chitosan (Fe 3 o 4 / SiO 2 / Cs) Synthesis of Adsorbent

[0041] Step 1, weigh 2.7g FeCl respectively 3 ·6H 2 O and 7.2g of sodium acetate were mixed and dissolved in 100ml of ethylene glycol, stirred magnetically for 35min to form a uniform yellow solution, then transferred to a hydrothermal reaction kettle, reacted at 180°C for 15h, cooled to room temperature, discarded the supernatant, and removed the black The precipitate was fully rinsed with deionized water, then rinsed three times with absolute ethanol, and dried in a vacuum oven at 45°C for 12 hours to obtain magnetic ferric iron tetroxide;

[0042] Step 2: Add 1.0 g of ultrasonically dispersed magnetic ferric iron tetroxide to a mixed solution composed of 320 mL of absolute ethanol and 80 mL of deionized water, adjust the pH to 11 with ammonia water, and 2 Under protection, mechanically stir and heat to 52°C, add 2mL tetraethyl orthosilicate dropwise to the mixed solution, continue stirring for 11.5...

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Abstract

The invention discloses a preparation method of magnetic chitosan. The preparation method comprises the following steps: dissolving sodium acetate and ferric chloride in ethanediol and reacting; after cooling to room temperature, washing with water and then with anhydrous ethanol; performing vacuum drying to obtain magnetic ferriferrous oxide; adding ultrasonically treated magnetic ferriferrous oxide into a mixed solution, adjusting the PH value to 11 and stirring and heating under the protection of N2; adding ethyl orthosilicate and continuing stirring; separating the product through a magnet and washing until the product is neutral; washing with anhydrous ethanol; performing vacuum drying to obtain Fe3O4 / SiO2 powder; dissolving chitosan in HCl; dropwise adding to the magnetic Fe3O4 / SiO2 water solution under the protection of N2; and adjusting the PH value to be neutral after reaction and performing vacuum drying to obtain the magnetic chitosan. The invention further discloses a method for adsorbing tannic acid. The adsorbing method comprises the following steps: adding magnetic chitosan into water to adsorb and separating through a magnet after saturation adsorption. The obtained magnetic chitosan is stable in chemical performance and renewable and can be recycled.

Description

technical field [0001] The invention belongs to the technical field of tannic acid purification of dissolved organic matter in water bodies, and relates to a preparation method of magnetic chitosan, and also relates to a method for using the prepared magnetic chitosan to absorb tannic acid in water. Background technique [0002] In recent years, the pollution caused by water-soluble organic compounds has become increasingly prominent. This kind of pollutants will have adverse effects on ecosystems, natural water bodies and human health, and has become a focus of environmental science and technology workers. Tannic acid is a water-soluble polyphenolic compound, which is decomposed by natural organic matter through physical and chemical processes, and widely exists in natural surface water and groundwater, and is a common dissolved organic matter in water bodies. Tannic acid has toxic effects on aquatic organisms (such as algae, fish and invertebrates), and it is easy to form ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/24B01J20/28B01J20/30C02F1/28C02F1/58
Inventor 王家宏金丙楠田昊汤伟
Owner TIANXINFU (BEIJING) MEDICAL APPLIANCE CO LTD
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