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Composite cationic ion-exchange resin supporting iron-series duplex metal nano granules as well as preparation method and use thereof

A bimetallic nanometer and cation exchange technology, which is applied in the direction of cation exchange materials, ion exchange water/sewage treatment, chemical instruments and methods, etc., can solve the problems of large pressure head loss and slow catalytic degradation rate, and improve the efficiency of catalytic degradation , The effect of rapid catalytic degradation ability

Inactive Publication Date: 2009-08-05
NANJING UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The invention provides an iron-based bimetallic nanocomposite cation exchange resin and its preparation method and application. The nanocomposite resin can solve the problem of slow catalytic degradation rate of the zerovalent iron-loaded nanocomposite resin and pressure head when the iron-based bimetallic nanoparticles are directly applied. To solve the problem of large losses, improve the catalytic degradation efficiency of nanocomposite resins, and provide better technical support for the deep purification and safety control of environmental micro-pollutants (such as heavy metal ions, macromolecular dyes, and halogenated organic substances, etc.)

Method used

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  • Composite cationic ion-exchange resin supporting iron-series duplex metal nano granules as well as preparation method and use thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Put 5g D001 resin into 0.1mol / L FeCl 3 The solution was exchanged for 4h, filtered, centrifuged and dehydrated with 0.25mol / L NaBH 4 The aqueous solution is reduced until no more bubbles come out of the solution. Then immerse the reacted resin in 0.01mol / L PdCl 2 4h in solution. Filter, wash with distilled water, and vacuum-dry for 24 hours to obtain an iron-loaded bimetallic nanocomposite cation exchange resin (Fe-Pd-D001). The content of Fe in the nanocomposite resin is 20 mg / g, the content of Pd is 10 mg / g, and the diameter of the Fe-Pd double metal nanoparticles is 5-100 nm.

[0026] Fe-Pd-D001 nanocomposite resin has a strong ability to catalyze the degradation of heavy metals Cr(VI) and Pb(II). For example, when the concentrations of Cr(VI) and Pb(II) in the water body are 10 and 15 mg / L respectively, the above materials can reduce the concentrations of Cr(VI) and Pb(II) to 0.02 and 0.005 respectively within 2 hours. mg / L or less.

[0027] Fe-Pd-D001 nanocom...

Embodiment 2

[0030] Put 5g D113 resin into 0.2mol / L FeCl 3 The solution was exchanged for 8h, filtered, centrifuged and dehydrated with 0.5mol / L NaBH 4 The aqueous solution is reduced until no more bubbles come out of the solution. Then immerse the reacted resin in 0.02mol / L AlCl 3 8h in the solution. Filter, wash with distilled water, and vacuum-dry for 24 hours to obtain an iron-loaded bimetallic nanocomposite cation exchange resin (Fe-Al-D113). The content of Fe in the nanocomposite resin is 40 mg / g, the content of Al is 20 mg / g, and the diameter of the Fe-Al double metal nanoparticles is 5-100 nm.

[0031] Fe-Al-D113 nanocomposite resin has a strong ability to catalyze the degradation of heavy metals Cd(II) and Pb(II). For example, when the concentrations of Cd(VI) and Pb(II) in the water body are 10 and 15 mg / L respectively, the above materials can reduce the concentrations of Cr(VI) and Pb(II) to 0.003 and 0.005 respectively within 2 hours. mg / L or less.

[0032] Fe-AI-D113 nan...

Embodiment 3

[0035] Put 5g Amberlite IRA-120 resin into 0.3mol / L FeCl 3 The solution was exchanged for 12h, filtered, centrifuged and dehydrated with 0.8mol / L NaBH 4 The aqueous solution is reduced until no more bubbles come out of the solution. Then immerse the reacted resin in 0.05mol / L CuCl 2 8h in the solution. Filter, wash with distilled water, and vacuum-dry for 24 hours to obtain an iron-loaded bimetallic nanocomposite cation exchange resin (Fe-Cu-IRA120). The content of Fe in the nanocomposite resin is 80 mg / g, the content of Cu is 30 mg / g, and the diameter of the Fe-Cu bimetallic nanoparticles is 5-100 nm.

[0036] Fe-Cu-IRA120 nanocomposite resin has a strong ability to catalyze the degradation of heavy metals Cr(VI) and Pb(II). For example, when the concentrations of Cr(VI) and Pb(II) in the water body are 10 and 15 mg / L respectively, the above materials can reduce the concentrations of Cr(VI) and Pb(II) to 0.02 and 0.005 respectively within 2 hours. mg / L or less.

[0037]...

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Abstract

The invention discloses a supported ferric bimetallic nanometer composite cation exchange resin, a preparation method and application thereof, which belong to the field of nanometer composite resin. A carrier of the resin is an ionic exchange and adsorption resin with an acidic functional group; a resin frame is styrene series or crylic acid series, and contains a sulfonic group, a carboxylic group or a phosphonic acid group; and a solid supported inorganic material is nanometer iron series bimetallic particles. The preparation method uses the ion exchange and adsorption resin with the acidic functional group as the carrier to be solidly loaded by Fe or Fe, is reduced by a NaBH4 or KBH4 solution, and is immersed in a salt solution of the second metal so as to produce the supported ferric bimetallic nanometer composite cation exchange resin. The supported ferric bimetallic nanometer composite cation exchange resin, the preparation method and the application thereof combine Donnan preenrichment effect and high-efficiency catalysis degradation effect into a whole, and improve the degradation speed of the material on a target pollutant while overcoming the deficiencies of easily agglomerated pure nanometer nulvalent iron, unstable chemical property, small particles, large hydraulic loss and the like, thereby having degradation characteristics of high efficiency, fast speed and low cost on an environment micro-pollutant.

Description

technical field [0001] The invention relates to a nano-composite resin for catalytically degrading environmental micro-pollutants, in particular to an iron-loaded bimetallic nano-composite cation exchange resin and its preparation method and application. Background technique [0002] Since the beginning of this century, the research on nanometer zero-valent iron has aroused the interest of many scholars. As an efficient reducing agent, nano-zero-valent iron has many characteristics such as high specific surface area, good catalytic activity, low cost, and environmental friendliness, and is widely used in the treatment of environmental pollutants, such as heavy metal ions, macromolecular dyes, and halogenated organic compounds. In catalytic degradation (Li, X.Q., Elliott, D.W., Zhang, W.X. Zero-Valent ironnanoparticles for abatement of environmental pollutants: Materials and engineering aspects. Critical Reviews in Solid State and Materials Sciences 2006, 31: 111-122). In or...

Claims

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Application Information

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IPC IPC(8): B01J39/20B01J31/28B01J31/08B01J31/10C02F1/42C02F1/62
Inventor 张炜铭蒋珍茂潘丙才吕路杜琼潘丙军张全兴
Owner NANJING UNIV
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