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Magnetic cyclodextrin-carbon nanofiber composite material and preparation method thereof

A technology of carbon nanofibers and composite materials, applied in chemical instruments and methods, other chemical processes, alkali metal compounds, etc., can solve the problems of unstable chemical properties, poor mechanical properties, long adsorption time, etc., to achieve improved stability, Improves the adsorption rate and adsorption capacity, and increases the surface area

Inactive Publication Date: 2015-07-22
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in practical application, cyclodextrin still faces some problems, such as: (1) unstable chemical properties, because it is easily dissolved and lost; (2) long adsorption time, time-consuming; (3) to metal ions and organic pollution (4) Difficult to separate; (5) Poor mechanical properties

Method used

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  • Magnetic cyclodextrin-carbon nanofiber composite material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0030] Example 1: Preparation of carbon nanofiber / magnetic cyclodextrin adsorption material

[0031] A. Preparation of functionalized carbon nanofibers

[0032] Put 0.5g of polyacrylonitrile nanofibers into a tube furnace, raise it from room temperature to 200°C, and then keep it for 3.5h for pre-oxidation treatment; then, under the protection of nitrogen, raise it to 1300°C for high-temperature pyrolysis, and cool naturally Carbon nanofibers can be obtained at room temperature.

[0033] Add 0.1 g of carbon nanofibers to 20 mL of concentrated nitric acid, heat to reflux in a water bath at 70°C, react for 16 minutes, stir in an ice bath for 1 hour, centrifuge, wash with dilute hydrochloric acid and ethanol in sequence, and dry to obtain functionalized carbon nanofibers.

[0034] B. Preparation of Magnetic Cyclodextrins

[0035] Prepare FeCl with a molar ratio of 2:1 3 with FeCl 2 Mixed solution 20mL, FeCl 3 and FeCl 2 The total mass of 0.35g was added to 20mL of ammonia w...

example 2

[0038] Example 2: Preparation of carbon nanofiber / magnetic cyclodextrin adsorption material

[0039] A. Preparation of functionalized carbon nanofibers

[0040] Put 0.5g of polyacrylonitrile nanofibers into a tube furnace, raise it from room temperature to 240°C, and then keep it for 3 hours for pre-oxidation treatment; then, under the protection of nitrogen, raise it to 1400°C for high-temperature pyrolysis, and cool naturally Carbon nanofibers can be obtained at room temperature.

[0041] Add 0.1 g of carbon nanofibers to 20 mL of concentrated nitric acid, heat to reflux in a water bath at 75°C, react for 18 min, stir in an ice bath for 1 h, centrifuge, wash with dilute hydrochloric acid and ethanol in sequence, and dry to obtain functionalized carbon nanofibers.

[0042] B. Preparation of Magnetic Cyclodextrins

[0043] Prepare FeCl with a molar ratio of 2:1 3 with FeCl 2 Mixed solution 20mL, FeCl 3 and FeCl 2The total mass of the solution is 0.45g, add 15mL of 20% am...

example 3

[0046] Example 3: Preparation of carbon nanofiber / magnetic cyclodextrin adsorption material

[0047] A. Preparation of functionalized carbon nanofibers

[0048] Put 0.5g of polyacrylonitrile nanofibers into a tube furnace, raise it from room temperature to 220°C, and then keep it for 3.5h for pre-oxidation treatment; then, under the protection of nitrogen, raise it to 1500°C for high-temperature pyrolysis, and cool naturally Carbon nanofibers can be obtained at room temperature.

[0049] Add 0.1 g of carbon nanofibers to 19 mL of concentrated nitric acid, heat to reflux in a water bath at 80°C, react for 18 minutes, stir in an ice bath for 1 hour, centrifuge, wash with dilute hydrochloric acid and ethanol in sequence, and dry to obtain functionalized carbon nanofibers.

[0050] B. Preparation of Magnetic Cyclodextrins

[0051] Prepare FeCl with a molar ratio of 2:1 3 with FeCl 2 Mixed solution 20mL, added FeCl 3 and FeCl 2 The total mass of 0.25g was added to 17mL of 17%...

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Abstract

The invention discloses a magnetic cyclodextrin-carbon nanofiber composite material and a preparation method thereof. Nano magnetic metal or a nano magnetic metallic oxide is taken as a carrier, cyclodextrin is firstly subjected to surface modification, magnetic cyclodextrin is obtained, the magnetic cyclodextrin is bonded to functional carbon nanofiber, and a novel nano magnetic biological adsorption material is obtained. By the aid of the preparation method, space orderliness of molecular arrangement is improved, the specific surface area of the polymer is greatly increased, the binding site of ions or molecules with cyclodextrin molecules is increased, and the internal mass transfer process is reduced. The prepared nano magnetic adsorption material has the advantages of controllability of a surface structure, good stability, high adsorbing capacity, fast adsorption balancing, high probability of separation, reusability and the like, can be used for directional recovery of precious metal and rare-earth metal as well as separation and enrichment of heavy metal in wastewater and has good application potential.

Description

technical field [0001] The invention belongs to the field of biological adsorption materials, in particular to a magnetic cyclodextrin-carbon nanofiber composite material and a preparation method thereof. Background technique [0002] Cyclodextrin, whose molecule is shaped like a cylinder, contains a large number of hydroxyl groups on the outside, and a hydrophobic cavity inside, which can combine with many inorganic and organic molecules to form host-guest inclusion complexes, and can change the physical and chemical properties of the inclusion complexes. It has the characteristics of protecting and stabilizing guest molecules and selectively orienting molecules; in addition, cyclodextrin has the advantages of wide sources, low price, easy degradation, and no pollution. Therefore, it has an important role in environmental protection and other fields as an adsorption material. research and application value. However, in practical application, cyclodextrin still faces some p...

Claims

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Application Information

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IPC IPC(8): B01J20/24B01J20/28B01J20/30
Inventor 史子璇范露露刘汝涛
Owner SHANDONG UNIV
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