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CDTA modified magnetic nano-adsorbent and preparation method and application thereof

A magnetic nanometer and adsorbent technology, applied in chemical instruments and methods, preparation of samples for testing, and other chemical processes, etc., to achieve the effect of simple method, improved adsorption capacity and selectivity, and good stability

Inactive Publication Date: 2015-04-22
FUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there is no one-step method for preparing CDTA-modified magnetic nanoadsorbents.

Method used

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  • CDTA modified magnetic nano-adsorbent and preparation method and application thereof
  • CDTA modified magnetic nano-adsorbent and preparation method and application thereof
  • CDTA modified magnetic nano-adsorbent and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Preparation of CDTA-modified magnetic nano-adsorbent

[0020] Quickly and accurately weigh 2.0 g of ferric chloride and dissolve it in 60 mL of ethylene glycol, add 5.0 g of anhydrous sodium acetate and mix in a beaker. The mixed solution was stirred with a magnetic stirrer, 0.8 g CDTA was added, the mixed solution was stirred with a magnetic stirrer, and moved into a water bath environment at 50°C, and continued to stir vigorously for 20 min until the solute was completely dissolved to form a uniform orange solution, and the solution was sealed in In a 100 mL polytetrafluoroethylene reaction kettle, lock it with a stainless steel jacket, and place it in a 190 °C reaction furnace for heating for 6 h. After taking it out, cool it to room temperature in the air, remove the reaction product, and wash it several times with absolute ethanol and deionized water respectively to remove residual substances. Dry in a vacuum oven at 50°C for 24 h to obtain CDTA-modified magnetic ...

Embodiment 2

[0022] Preparation of CDTA-modified magnetic nano-adsorbent

[0023] Quickly and accurately weigh 2.5 g of ferric chloride and dissolve it in 70 mL of ethylene glycol, add 6.0 g of anhydrous sodium acetate and mix in a beaker. Stir the mixed solution with a magnetic stirrer, add 0.8 g CDTA, stir the mixed solution with a magnetic stirrer, and move it into a 60°C water bath environment, and continue to stir vigorously for 30 min until the solute is completely dissolved to form a uniform orange solution, and seal the solution In a 100 mL polytetrafluoroethylene reactor, lock it with a stainless steel jacket, and place it in a 210 °C reaction furnace for heating for 10 h. After taking it out, cool it to room temperature in the air, remove the reaction product, and wash it several times with absolute ethanol and deionized water respectively to remove residual substances. Dry in a vacuum oven at 50°C for 24 h to obtain CDTA-modified magnetic nanoparticles.

Embodiment 3

[0025] Preparation of CDTA-modified magnetic nano-adsorbent

[0026] Quickly and accurately weigh 2.2 g ferric chloride and dissolve it in 65 mL ethylene glycol, add 5.5 g anhydrous sodium acetate and mix in a beaker. The mixed solution was stirred with a magnetic stirrer, 0.8 g CDTA was added, the mixed solution was stirred with a magnetic stirrer, and moved into a water bath environment at 55 °C, and continued to stir vigorously for 25 min until the solute was completely dissolved to form a uniform orange solution, and the solution was sealed in In a 100 mL polytetrafluoroethylene reaction kettle, lock it with a stainless steel jacket, and place it in a reaction furnace at 200°C for a heating reaction for 8 hours. After taking it out, cool it to room temperature in the air, remove the reaction product, and wash it several times with absolute ethanol and deionized water respectively to remove residual substances. Dry in a vacuum oven at 50°C for 24 h to obtain CDTA-modified ...

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Abstract

The invention discloses a CDTA modified magnetic nano-adsorbent and a preparation method and application of the CDTA modified magnetic nano-adsorbent and belongs to the field of adsorbing material preparation. The preparation method comprises the steps that polyol is used as a solvent, ferric salt and a functional monomer are dissolved in the solvent, a weak base is added to the solvent, and the solvent is evenly stirred; CDTA modified magnetic nano-adsorbent with a uniform practical size is synthesized in a one-off mode with a solvothermal method, the particle size ranges from 140 nm to 160 nm, and the saturation magnetization intensity ranges from 70 emu / g to 80 emu / g. The prepared nano-adsorbent has uniform particle size distribution and also has superparamagnetism. During magnetic solid-phase extraction, separation and collection can be easily conducted from a system to be tested through an applied magnetic field, a fussy filtering or centrifugal process is avoided, and operation is easy. The CDTA modified magnetic nano-adsorbent has the advantages that bonding is firm, property is stable, reproducibility is good, selectivity is good, and the enrichment multiple is large, and the CDTA modified magnetic nano-adsorbent can be widely used in a wide pH range and is applied to enrichment pretreatment of trace Cu (II) in an environmental water sample.

Description

technical field [0001] The invention belongs to the field of adsorption material preparation, and in particular relates to a CDTA-modified magnetic nano-adsorbent and its preparation method and application. Background technique [0002] Copper is one of the necessary elements for the human body to maintain normal structure, function and cell proliferation. However, excessive copper will cause abnormal metabolism of the human body and bring great harm to the human body. Therefore, it is of great significance to accurately measure the concentration of Cu(II) in environmental samples. Flame atomic absorption spectrometry has been widely used in the detection of trace copper ions due to its advantages of simple operation, fast analysis speed and wide application range. However, in actual operation, the concentration of copper ions in environmental samples is extremely low and its composition is complex, so it is difficult to directly measure it by flame atomic absorption, and ...

Claims

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Application Information

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IPC IPC(8): B01J20/22B01J20/28B01J20/30G01N1/40
CPCB01J20/22B01J20/28007B01J20/28009C02F1/285G01N1/405
Inventor 吕海霞王晓明谢增鸿
Owner FUZHOU UNIV
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