Method of obtaining preserved thermodynamic parameter and the adsorption isotherm of organic compound on carbon nano tube

An organic compound, adsorption isotherm technology, applied in the field of environmental pollution control, to achieve the effects of avoiding environmental pollution, less reagent consumption, and simple operation

Active Publication Date: 2013-06-19
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, there is no report on the determination of the adsorption performance of carbon nanotubes by van't Hoff equation and liquid chromatography head-on analysis based on carbon nanotube chromatographic columns.

Method used

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  • Method of obtaining preserved thermodynamic parameter and the adsorption isotherm of organic compound on carbon nano tube
  • Method of obtaining preserved thermodynamic parameter and the adsorption isotherm of organic compound on carbon nano tube
  • Method of obtaining preserved thermodynamic parameter and the adsorption isotherm of organic compound on carbon nano tube

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Experimental program
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Effect test

Embodiment 1

[0038]Leakage test and cleaning of packed column: choose 4.6×50mm stainless steel column, and the empty column should ensure that both ends are flat and free of burrs; block the outlet of the column tube and immerse it in water, and the carrier gas is passed into the stainless steel column under high pressure. At the inlet, observe whether there are bubbles coming out of the packed column. If there are bubbles, it means that the packed column is leaking and cannot be used; wash it with methanol to remove the grease on the surface of the column tube, rinse it with tap water, and finally wash it with distilled water and acetone. Dry thoroughly in the oven for later use.

[0039] Filled chromatographic column: use high-pressure homogenization method to fill the chromatographic column, weigh 250mg of multi-walled carbon nanotubes into a 50ml glass conical flask, you can choose multi-walled carbon nanotubes with a purity of 95%, an outer diameter of 3-10nm, and a length of 5-20nm n...

Embodiment 2

[0043] After the baseline of the system is stable, at 20°C, use 100% acetonitrile as the mobile phase, the flow rate is 0.15ml / min, the injection volume is 1μL, use a diode array detector (DAD detector), and the ultraviolet detection wavelength is 254nm. Determination of the dead time t of multi-walled carbon nanotube liquid chromatography columns as a dead time marker 0 , using methanol as a solvent, configure 1g / L phenol solution, the ultraviolet detection wavelength is 230nm, and other conditions are the same, measure the retention time t of phenol on the multi-walled carbon nanotube liquid chromatography column R , according to the formula (1) to calculate the retention factor k' of phenol at 25°C.

[0044] Set the temperature of the column thermostat to 25°C, 30°C, 35°C, 40°C, and 45°C respectively, and keep other conditions unchanged, measure the k' of phenol on the multi-walled carbon nanotubes at different temperatures, and obtain six The lnk' of the temperature point...

Embodiment 3

[0046] After the baseline of the system is stable, at 20°C, use 100% acetonitrile as the mobile phase, the flow rate is 0.15ml / min, the injection volume is 1μL, use a diode array detector (DAD detector), and the ultraviolet detection wavelength is 254nm. Determination of the dead time t of multi-walled carbon nanotube liquid chromatography columns as a dead time marker 0 , using methanol as a solvent, configure 1g / L sulfamethazine solution, the ultraviolet detection wavelength is 265nm, and other conditions are the same, measure the retention time t of sulfamethazine on the multi-walled carbon nanotube liquid chromatography column R , according to the formula (1) to calculate the retention factor k' of sulfamethazine at 25°C.

[0047] Set the temperature of the column thermostat to 25°C, 30°C, 35°C, 40°C, and 45°C respectively, and keep other conditions unchanged, measure the k' of sulfamethazine on the multi-walled carbon nanotube at different temperatures, and you will get ...

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Abstract

The invention discloses a method of obtaining the preserved thermodynamic parameter and the adsorption isotherm of an organic compound on a carbon nano tube. The method of obtaining the preserved thermodynamic parameter and the adsorption isotherm of the organic compound on the carbon nano tube includes the following steps of preparing a carbon nano tube homogenate with dimethylformamide as a dispersing agent, and preparing 4.6*50mm carbon nano tube chromatographic column through a pneumatic constant pressure pump, wherein the filling quantity is 250mg; calculating the preserved chromatographic column of the organic compound on the carbon nano tube by measuring retention time of the organic compound on the carbon nano tube at different temperatures; and measuring the breakthrough curves of the organic compound at different concentrations on the carbon nano tube, fitting the Linear adsorption isotherm and the Freundlich adsorption isotherm, and calculating the adsorption equilibrium constant of the Linear and the Freundlich. The thermodynamic parameter and the adsorption isotherm on the carbon nano tube are obtained based on a chromatographic method, and therefore operation is simple, solid-liquid separation is easy, frequent replacements of the chromatographic column is not needed, and consumption of materials and medicine is reduced. The method of obtaining the preserved thermodynamic parameter and the adsorption isotherm of the organic compound on the carbon nano tube has important value on evaluation of utilization potentiality of the carbon nano tube as adsorbing material in fields of water pollution regulation, sample pretreatment, analytical tests and the like.

Description

technical field [0001] The invention relates to a method for obtaining retention thermodynamic parameters and adsorption isotherms by measuring the retention time of organic compounds on a carbon nanotube chromatographic column at different temperatures, and belongs to the technical field of environmental pollution control. Background technique [0002] Since the first discovery of carbon nanotubes in 1991, they have attracted extensive attention due to their unique mechanical, electrical, optical and thermodynamic properties. The basic structure of carbon nanotubes is a defect-free tubular substance formed by rolling graphene sheets (graphite hexagonal network planes) into a seamless cylinder. Carbon nanotubes have excellent adsorption properties. As an adsorption material, they can be used in environmental pollution control, in-situ remediation of pollution and sample analysis. As an adsorbent, carbon nanotubes can quickly and efficiently remove metal ions, organic polluta...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N30/02G01N30/60
Inventor 李雪花褚莹倩陈景文
Owner DALIAN UNIV OF TECH
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