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Preparation method of multi-layer hole active carbon membrane coating solid phase micro-extraction head

A solid-phase microextraction head and activated carbon technology, which is applied in chemical instruments and methods, alkali metal oxides/hydroxides, inorganic chemistry, etc., can solve the problems of low VOCs extraction rate, poor thermal stability of coatings, and specific surface area. Small and other problems, to achieve the effect of large extraction volume, good thermal stability, and large specific surface area

Inactive Publication Date: 2018-05-29
武夷学院 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to poor thermal stability, small specific surface area and low porosity of the coating, the extraction rate of VOCs in the air is not high and the reproducibility rate is low

Method used

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  • Preparation method of multi-layer hole active carbon membrane coating solid phase micro-extraction head

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] This embodiment provides a method for preparing a solid-phase microextraction head coated with a multi-layer porous activated carbon film, which specifically includes the following steps:

[0024] 1. Dissolve 0.05 g of polycarbomethylsilane in 9.95 g of tetrahydrofuran solvent, stir magnetically at room temperature for 3 hours, and prepare a solution with a mass concentration of 0.5 wt%.

[0025] 2. The stainless steel wire was corroded in a hydrofluoric acid solution with a mass fraction of 2% for 30 minutes, washed with distilled water until neutral, and dried to obtain a surface-modified stainless steel wire. Insert the surface-modified stainless steel wire into the above solution, soak in the solution for 5 minutes, then quickly take it out and put it into a closed container with a temperature and humidity of 20°C and 75% R.H. respectively, and keep it for 10 minutes. The stainless steel wire was taken out, and the coated stainless steel wire was vacuum-dried at 50°...

Embodiment 2

[0034] This embodiment provides a method for preparing a solid-phase microextraction head coated with a multi-layer porous activated carbon film, which specifically includes the following steps:

[0035]1. Dissolve 0.1 g of polycarbomethylsilane in 9.9 g of tetrahydrofuran solvent, stir magnetically for 3 hours at room temperature, and prepare a solution with a mass concentration of 1 wt%.

[0036] 2. The stainless steel wire was corroded in a hydrofluoric acid solution with a mass fraction of 2% for 30 minutes, washed with distilled water until neutral, and dried to obtain a surface-modified stainless steel wire. Insert the surface-modified stainless steel wire into the above solution, soak in the solution for 5 minutes, then quickly take it out and put it into a closed container with a temperature and humidity of 20°C and 75% R.H. respectively, and keep it for 10 minutes. The stainless steel wire was taken out, and the coated stainless steel wire was vacuum-dried at 50° C. f...

Embodiment 3

[0045] This embodiment provides a method for preparing a solid-phase microextraction head coated with a multi-layer porous activated carbon film, which specifically includes the following steps:

[0046] 1. Dissolve 0.3 g of polycarbomethylsilane in 9.7 g of tetrahydrofuran solvent, stir magnetically for 3 hours at room temperature, and prepare a solution with a mass concentration of 3 wt%.

[0047] 2. The stainless steel wire was corroded in a hydrofluoric acid solution with a mass fraction of 2% for 30 minutes, washed with distilled water until neutral, and dried to obtain a surface-modified stainless steel wire. Insert the surface-modified stainless steel wire into the above solution, soak in the solution for 5 minutes, then quickly take it out and put it into a closed container with a temperature and humidity of 20°C and 83% R.H. respectively, and keep it for 10 minutes. The stainless steel wire was taken out, and the coated stainless steel wire was vacuum-dried at 50° C. ...

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Abstract

The invention relates to a preparation method of a multi-layer hole active carbon membrane coating solid phase micro-extraction head. According to the technical scheme of the invention, the surface ofa stainless steel wire is covered with a polycarboxymethyl silane precursor of a multi-layer hole structure with a vapor assistance method, and stabilization, carbonization and chlorination reactionis performed to obtain the multi-layer hole active carbon membrane coating solid phase micro-extraction head. The preparation method provided by the invention is simple in process, does not cause environmental pollution and is suitable for large-scale industrial preparation. A multi-layer hole active carbon membrane coating has the characteristics of large specific surface area, high porosity andthe like, so that the extraction head is strong in enrichment capacity, large in extraction quantity, good in thermal stability, rapid in parsing speed and long in service life, has higher precision and accuracy and can rapidly determine the content of volatile organic compounds in air.

Description

technical field [0001] The invention relates to a preparation method of a solid-phase micro-extraction head coated with a multi-layer porous activated carbon film, and belongs to the technical field of the solid-phase micro-extraction head. Background technique [0002] Volatile organic compounds (VOCs) in the air are a class of organic pollutants with complex composition and various forms that are ubiquitous in the air. Due to the relatively closed indoor environment, VOCs slowly released from various building and decoration materials accumulate indoors, leading to indoor air VOCs pollution, which poses a potential hazard to human health. The problem of indoor air pollution has attracted widespread attention. The traditional detection of VOCs mainly adopts the active sample enrichment method (Active sample enrichment). For example, VOCs are adsorbed on a solid adsorbent, and then chromatographic analysis is performed by solvent desorption or secondary thermal desorption. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/282B01J20/28B01J20/30G01N30/02G01N30/08
CPCB01J20/28035B01J20/28066B01J20/28085B01J20/28095B01J20/282B01J2220/52B01J2220/54B01J2220/82G01N30/02G01N30/08G01N2030/062
Inventor 林皓赵瑨云刘瑞来胡家朋徐婕付兴平赵升云吴芳芳
Owner 武夷学院
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