Solid phase micro-extraction extraction head using odd-tube carbon nano-tube as coating and its preparation method

A single-walled carbon nanotube, carbon nanotube technology, applied in solid solvent extraction, chemical instruments and methods, other chemical processes, etc. Affect the coating extraction efficiency and other problems, and achieve the effect of easy control of coating thickness, simple operation and good conductivity

Inactive Publication Date: 2008-11-19
XIAMEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The extraction head prepared by the above method has the following disadvantages: the coating contains a large proportion of organic binders, and the electrical conductivity is greatly reduced, so it cannot be used for electro-adsorption enhanced solid-phase microextraction; It will swell or even dissolve, so the coating is not resistant to organic solvents; single-walled carbon nanotubes are porous solids, and the presence of organic binders will block the pores, thereby affecting the extraction efficiency of the coating

Method used

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  • Solid phase micro-extraction extraction head using odd-tube carbon nano-tube as coating and its preparation method
  • Solid phase micro-extraction extraction head using odd-tube carbon nano-tube as coating and its preparation method
  • Solid phase micro-extraction extraction head using odd-tube carbon nano-tube as coating and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] 1) Treatment of single-walled carbon nanotubes: add single-walled carbon nanotubes to the mixed solution of sulfuric acid and nitric acid, reflux, and centrifuge the mixed solution after reflux to obtain carbon nanotube precipitates, wash with water until neutral, dry, and process The final single-walled carbon nanotubes are ready for use; the ratio of sulfuric acid: nitric acid is 7:3 by volume, the temperature of reflux is 80° C., and the time of reflux is 90 minutes.

[0036] 2) Preparation of single-walled carbon nanotube suspension: add treated single-walled carbon nanotubes in an organic solvent, disperse under the action of ultrasonic waves to obtain a carbon nanotube suspension; the concentration of the single-walled carbon nanotube suspension is 3 mg / ml, the organic solvent is methanol.

[0037] 3) Electrophoretic deposition of single-walled carbon nanotubes on platinum wires: insert two platinum wires into the carbon nanotube suspension, the distance between ...

Embodiment 2

[0040] 1) Treatment of single-walled carbon nanotubes: similar to Example 1, the difference is that the reflow temperature is 100° C., and the reflow time is 60 min.

[0041] 2) Preparation of single-wall carbon nanotube suspension: similar to Example 1, the difference is that the concentration of the single-wall carbon nanotube suspension is 0.5 mg / ml, and ethanol is selected as the organic solvent.

[0042] 3) Electrophoretic deposition of single-walled carbon nanotubes on metal wires: similar to Example 1, the difference is that the metal wires are gold wires with a spacing of 0.5 cm, and a 5V DC voltage is added between two gold wires to carry out carbon deposition. For the electrophoretic deposition of nanotubes, carbon nanotubes were gathered around the anode gold wire after continuous power-on for 10.0min, and the anode gold wire was taken out and dried at 100°C.

[0043] Step 4) is the same as step 4) of Example 1.

Embodiment 3

[0045] 1) Treatment of single-walled carbon nanotubes: similar to Example 1, the difference is that the reflow temperature is 150° C., and the reflow time is 10 min.

[0046] 2) Preparation of single-walled carbon nanotube suspension: similar to Example 1, the difference is that the concentration of the single-walled carbon nanotube suspension is 5 mg / ml, and the organic solvent is isopropanol.

[0047] 3) Electrophoretic deposition of single-walled carbon nanotubes on metal wires: similar to Example 1, the difference is that the metal wires are stainless steel wires with a spacing of 2cm, and a 100V DC voltage is added between the two stainless steel wires to carry out carbon nanotube deposition. For electrophoretic deposition of tubes, carbon nanotubes gather around the anode stainless steel wire after continuous energization for 0.1min. Take out the anode stainless steel wire and dry it at 150°C.

[0048] Step 4) is the same as step 4) of Example 1.

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Abstract

A solid phase micro-extraction fiber which takes a single-walled carbon nanotube as the coating and the preparation method thereof relate to a solid phase micro-extraction fiber. The invention provides a solid phase micro-extraction fiber which takes the single-walled carbon nanotube as the coating as well as the preparation method thereof. A fixing clip, an inner tube, a gland bush, an outer tube, a metal wire and a single-walled carbon nanotube are provided, the top part of the inner tube is connected with the fixing clip, the lower part of the inner tube is arranged in the outer tube, the gland bush is arranged at the joint part of the inner tube and the top part of the outer tube, the top part of the metal wire is connected with the bottom part of the inner tube, and the surface of the metal wire is covered with the coating of the single-walled carbon nanotube. The suspension liquid of the single-walled carbon nanotube is prepared after the single-walled carbon nanotube is processed, then the single-walled carbon nanotube is subjected to electrophoretic deposition on the metal wire, and finally, the extraction fiber is inserted into the micro-extraction fiber inner tube. The coating is of the single-walled carbon nanotube with good electronic conductivity, and does not contain any other substances influencing the electronic conductivity thereof, and the carrier of the coating is the metal wire, thereby the electronic conductivity is good. The invention can be applied to the electrical absorption enhanced solid phase micro-extraction, and has the advantages of high extraction efficiency, high temperature, strong acid and strong alkali resistance, and strong adsorption capacity.

Description

technical field [0001] The invention relates to a solid phase microextraction (solid phase microextraction) extraction head, in particular to a solid phase microextraction extraction head coated with single-walled carbon nanotubes and a preparation method thereof. Background technique [0002] Solid-phase microextraction technology has the characteristics of simple operation, no extraction solvent, and can be used online with GC and HPLC. It is a new sample pretreatment technology widely used in the fields of environmental analysis and food analysis (1, Alpendurada M.F., J . Chromatogr. A, 2000, 889: 3). The solid phase microextraction head is the core of the solid phase microextraction technology. At present, there are dozens of commercial and self-made solid-phase microextraction heads with different coatings, but these extraction heads have low extraction efficiency for polar compounds and ionic compounds. The preparation technology that adopts mainly contains direct co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/281B01D11/02B01J20/30
Inventor 李权龙王雪凤袁东星
Owner XIAMEN UNIV
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