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Porous carbon solid-phase micro-extraction coating and its preparation and application

A porous carbon and coating technology, which is applied in the field of analytical chemistry and environmental monitoring, can solve the problems of difficult monitoring of volatile organic compounds and immature monitoring methods of volatile organic pollutants, and achieve excellent thermal stability, strong extraction performance, and production The effect of simple process

Active Publication Date: 2017-09-19
INST OF SOIL SCI CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the monitoring methods for volatile organic pollutants are still immature, and it is difficult to monitor trace levels of volatile organic compounds

Method used

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  • Porous carbon solid-phase micro-extraction coating and its preparation and application
  • Porous carbon solid-phase micro-extraction coating and its preparation and application
  • Porous carbon solid-phase micro-extraction coating and its preparation and application

Examples

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Embodiment 1

[0024] In this example, by selecting six chlorobenzene compounds as the representative substances of volatile organic pollutants, the method for the determination of volatile organic pollutants in water bodies by the new porous carbon solid-phase microextraction coating is illustrated. The analysis results of the prepared coating can be found in the attached Figure 1~5 .

[0025] Preparation of porous carbon material: Put potassium citrate in an oven at 120°C for overnight drying, weigh 5.0000g of potassium citrate with a high-precision balance, place it in a boat-shaped crucible, and then place it in a TL1200 tube furnace at 3°C / min Raise the temperature to 850°C, keep it for 1h, pass nitrogen gas (50mL / min) for protection during the whole process, and finally cool down naturally to complete the carbonization process. After the material is cooled to room temperature, use a large amount of 10% (V / V) hydrochloric acid to wash and filter to remove impurities, then use excess de...

Embodiment 2

[0031] In this example, the extraction performance of the new porous carbon SPME coating is illustrated by comparing the extraction amount of six chlorobenzene compounds with commercial coating polydimethylsiloxane. Preparation of porous carbon material, porous carbon material coating and extraction process are consistent with Example 1. First use polydimethylsiloxane to extract six kinds of chlorobenzenes, and then use porous carbon coating to extract six kinds of chlorobenzenes with the same concentration, repeat three times for analysis, the results are shown in Figure 5 . For the six chlorobenzene compounds, the extraction amount of the porous carbon coating was higher than that of the commercial polydimethylsiloxane coating, and the extraction amount was 2.14-42.37 times that of polydimethylsiloxane. It shows that the porous carbon coating of the present invention can efficiently and accurately determine trace amounts of volatile organic pollutants in water environment,...

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Abstract

The invention discloses a porous carbon solid-phase micro-extraction coating and its preparation and application. The porous carbon coating material takes potassium citrate as a carbon precursor, carbonization at high temperature is performed under the nitrogen protection, and self-activation is performed then to generate a template; a developed pore structure is generated through hydrochloric acid and ultra-pure water cleaning. The porous carbon solid-phase micro-extraction coating does not need the use of the template and an activating agent; the porous carbon solid-phase micro-extraction coating is green, simple, handy and low in price. The material has developed pores, huge specific surface area and high electronegativity, and strong absorption to benzene-ring-containing organic matters. The porous carbon solid-phase micro-extraction coating has high extraction efficiency and good reproducibility. Therefore, the porous carbon solid-phase micro-extraction coating can be applied to monitor trace volatile organic compounds in environments.

Description

technical field [0001] The invention relates to the fields of analytical chemistry and environmental monitoring, in particular to a porous carbon solid-phase microextraction coating and its preparation method and application. Background technique [0002] Solid-phase microextraction integrates sampling, enrichment, purification and sample injection, without the use of organic reagents, and is a green analysis and detection technology. Therefore, it has developed rapidly in recent years, especially in the field of monitoring and detection of volatile and semi-volatile organic pollutants. The principle of solid-phase microextraction technology is based on diffusion and adsorption theory, so the coating is the core component of the technology, which directly determines the sensitivity and accuracy of the determination method. At present, the types of commercially available coatings are limited, and have the disadvantages of being fragile, expensive, and poor in thermal stabili...

Claims

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Application Information

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IPC IPC(8): B01J20/282B01D15/10B01J20/30G01N33/18
CPCB01D15/10B01J20/282G01N33/1826Y02A20/20
Inventor 宋洋程虎卞永荣纪荣婷蒋新王芳
Owner INST OF SOIL SCI CHINESE ACAD OF SCI
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