Magnetic nanometer particle based on lignin carboxylate as well as preparation method and application thereof to chromium adsorption

A technology of magnetic nanoparticles and lignin, applied in chemical instruments and methods, adsorption water/sewage treatment, other chemical processes, etc. problem, to achieve the effect of low price, lower production cost, and improved adsorption performance

Active Publication Date: 2018-11-02
SOUTH CHINA UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, based on the current research situation, the current methods generally have some shortcomings: (1) Some polymers, such as synthetic polymers, chitosan, proteins, etc., are relatively expensive, which limits the application of magnetic nanoparticles in the fields of adsorption, separation, and enzyme immobilization. Applications
(2) Magnetic particles are prone to strong agglomeration, and i

Method used

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  • Magnetic nanometer particle based on lignin carboxylate as well as preparation method and application thereof to chromium adsorption
  • Magnetic nanometer particle based on lignin carboxylate as well as preparation method and application thereof to chromium adsorption
  • Magnetic nanometer particle based on lignin carboxylate as well as preparation method and application thereof to chromium adsorption

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Experimental program
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Effect test

Embodiment 1

[0044] Dissolve 2.5g of ferrous sulfate and 3g of ferric chloride in 100mL of water, transfer to a four-necked flask, heat up to 80°C under mechanical stirring, slowly drop into 10g of 25% ammonia solution at a rate of 1 drop / second. After the dropwise addition is completed, heat-preserve and ripen for 3.5 hours. After dissolving 3g of sodium lignin carboxylate into 12g of aqueous solution, drop it into the above reaction system together with 18g of absolute ethanol at the same time, the dropping rate is 1 drop / second, and keep stirring for 2 hours after the dropping is completed. Finally, the magnetic particles were separated by a permanent magnet, washed three times with ethanol, and vacuum-dried at 60°C to obtain lignin carboxylate magnetic nanoparticles. The average particle size of the prepared lignin carboxylate magnetic nanoparticles is about 71nm, and the BET specific surface area is 412m 2 / g.

[0045]1 g of lignin carboxylate magnetic nanoparticles was added to 100...

Embodiment 2

[0047] Dissolve 5g of ferrous sulfate and 6g of ferric chloride in 100mL of water, transfer to a four-necked flask, heat up to 90°C under mechanical stirring, and slowly add 20g of 25% ammonia solution dropwise at a rate of 1 drop / second. After the dropwise addition, heat preservation and aging for 4h. After dissolving 6g of calcium lignin carboxylate into 24g of aqueous solution, drop it into the above-mentioned reaction system together with 36g of methanol at the same time, the dropping speed is 1 drop / second, and keep stirring for 1 hour after the dropping is completed. Finally, the magnetic particles were separated by a permanent magnet, washed three times with ethanol, and dried in vacuum at 50°C to obtain lignin carboxylate magnetic nanoparticles. The average particle size of the prepared lignin carboxylate magnetic nanoparticles is about 99nm, and the BET specific surface area is 330m 2 / g.

[0048] 1 g of lignin carboxylate magnetic nanoparticles was added to 100 mL ...

Embodiment 3

[0050] Dissolve 3g of ferrous sulfate and 5g of ferric chloride in 100mL of water, transfer to a four-necked flask, heat up to 70°C under mechanical stirring, slowly drop into 15g of 25% ammonia solution at a rate of 1 drop / second. After the dropwise addition, heat preservation and aging for 3h. After dissolving 5g of magnesium lignin carboxylate into 25g of aqueous solution, drop it into the above reaction system together with 37.5g of n-propanol at the same time, at a rate of 1 drop / second, and keep stirring for 3 hours after the addition. Finally, the magnetic particles were separated by a permanent magnet, washed three times with ethanol, and vacuum-dried at 70°C to obtain lignin carboxylate magnetic nanoparticles. The average particle size of the prepared lignin carboxylate magnetic nanoparticles is about 117nm, and the BET specific surface area is 296m 2 / g.

[0051] 1 g of lignin carboxylate magnetic nanoparticles was added to 100 mL of Cr(VI) solution with a concentr...

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Abstract

The invention belongs to the technical field of a magnetic adsorption agent, and discloses a magnetic nanometer particle based on lignin carboxylate as well as a preparation method and application thereof to chromium (VI) adsorption. The method provided by the invention comprises the following steps of dissolving ferrous sulfate and ferric chloride into water; performing preheating; dripping ammonium hydroxide; performing heat insulation curing for 3 to 4 h at 70 to 90 DEG C; adding lignin carboxylate solution and short chain alcohol into the system; performing heat insulation stirring for 1 to 3 h; performing separation and drying to obtain the magnetic nanometer particles based on the lignin carboxylate. The lignin carboxylate with rich sources is used as a carbon supply source; the price is low; green and environmental-friendly effects are achieved; the adsorption performance on the chromium (VI) can be improved through controlling the encapsulation and carrying capability of the lignin on the surface of the magnetic particles and more critically through the regulation and control on the particle diameter of the magnetic nanometer particles. The magnetic nanometer particle basedon lignin carboxylate obtained through preparation has the advantages of strong combination force, great encapsulation quantity and strong adsorption capability on chromium (VI), and can be applied to chromium (VI) adsorption.

Description

technical field [0001] The invention belongs to the technical field of magnetic adsorbents, in particular to a lignin carboxylate-based magnetic nanoparticle, a preparation method thereof and an application in adsorbing chromium (VI). Background technique [0002] Magnetic nanoparticles have a wide range of applications in the fields of magnetic fluid, catalysis, targeted medicine, adsorption separation, nuclear magnetic resonance and other fields. In order to further functionalize the magnetic particles and prevent the oxidation and agglomeration of the particles, it is usually necessary to modify the surface with polymer substances. At present, scientific and technological workers at home and abroad have carried out a lot of research work on this. [0003] Xuan et al first prepared Fe 3 o 4 Nanoparticles, and then add aniline, through the initiator to trigger the polymerization of aniline molecules on the surface of nanoparticles, to obtain Fe 3 o 4 / Polyaniline magn...

Claims

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Application Information

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IPC IPC(8): B01J20/24B01J20/28C02F1/28B01J20/30C02F101/22
CPCB01J20/06B01J20/24B01J20/28009C02F1/288C02F2101/22
Inventor 郑大锋马樱芷邱学青杨东杰莫振业董芮璟
Owner SOUTH CHINA UNIV OF TECH
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