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Preparation method of conductive polymer coated silica gel and its application in solid phase extraction

A conductive polymer, silica gel technology, applied in the field of analytical chemistry, can solve problems such as spending a lot of time, limiting the application of conductive polymer materials, and different particle sizes of polypyrrole

Inactive Publication Date: 2015-11-11
WUHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in this method, due to the different sizes of polypyrrole particles obtained by oxidative polymerization, it takes a lot of time to screen out particles with a particle size of less than 50 μm before extraction, so as to avoid the extraction failure caused by blocking the SPE sieve plate, which is to a large extent Limits the application of conductive polymer materials in SPE

Method used

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  • Preparation method of conductive polymer coated silica gel and its application in solid phase extraction
  • Preparation method of conductive polymer coated silica gel and its application in solid phase extraction
  • Preparation method of conductive polymer coated silica gel and its application in solid phase extraction

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Embodiment 1: Preparation of polypyrrole-coated silica gel

[0020] Soak 20g of amino silica gel in 40mL of n-hexane, add 2mL of pyrrole monomer and mix well; then put the mixture in a fume hood, and after the n-hexane evaporates to dryness, soak the amino silica gel with pyrrole monomer absorbed in 40mL of 0.05g / mL FeCl 3 ·6H 2 In an aqueous solution of O, vibrate in a water bath at 40°C for 24 hours, filter with suction, wash with pure water and industrial alcohol alternately for several times, and obtain polypyrrole-coated silica gel after drying. figure 1 SEM image of polypyrrole-coated silica gel.

Embodiment 2

[0021] Embodiment 2: the preparation of polyaniline coated silica gel

[0022] Soak 10g of amino silica gel in 20mL of n-hexane, add 1mL of aniline monomer and mix well; then place the mixture in a fume hood, and after the n-hexane evaporates to dryness, soak the amino silica gel adsorbed with aniline monomer in 20mL of 0.1g / mL FeCl 3 ·6H 2 In an aqueous solution of O, vibrate in a water bath at 40°C for 24 hours, filter with suction, wash with pure water and industrial alcohol alternately for several times, and obtain polyaniline-coated silica gel after drying.

Embodiment 3

[0023] Embodiment 3: Preparation of polythiophene-coated silica gel

[0024] Soak 15g of amino silica gel in 20mL of n-hexane, add 2mL of thiophene monomer and mix well; then place the mixture in a fume hood, and after the n-hexane evaporates to dryness, soak the amino silica gel adsorbed with thiophene monomer in 30mL of 0.2g / mL FeCl 3 ·6H 2 In an aqueous solution of O, shake in a water bath at 40°C for 24 hours, filter with suction, wash with pure water and industrial alcohol alternately for several times, and dry to obtain polythiophene-coated silica gel.

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Abstract

The invention discloses a preparation method of conducting polymer coating silica gel and application of the material to extraction and analysis of pi electron-containing compounds such as benzopyrene in edible oil as well as the illegal additives of Sudan red and rhodamine B in foods as a solid phase extraction adsorbent. The preparation method comprises the following steps: adsorbing a conducting polymer monomer to the surface of polar silica gel through the interaction of hydrogen bonds; performing in-situ oxidative polymerization to obtain the conducting polymer coating silica gel. The preparation method of the material is simple, safe, easy to implement as well as cheap and readily-available in raw materials. The material obtained by using the preparation method is good in repeatability, and has the characteristics of good impurity-removing effect, high recovery rate, high stability and the like when being applied to separation and enrichment of pi electron-containing compounds in foods, environment, organisms and the like as a solid phase extraction filler.

Description

technical field [0001] The invention relates to a preparation method of conductive polymer-coated silica gel and its application in food safety as a novel solid-phase extraction filler, belonging to the technical field of analytical chemistry. Background technique [0002] As the analysis objects faced by modern separation and analysis technology become more and more complex, and the content of target analytes is getting lower and lower, in order to obtain accurate and reliable analysis results, in addition to relying on high-sensitivity and high-precision analytical instruments, more effective The approach is to develop efficient and robust sample pretreatment techniques to enrich and purify target analytes. Currently available sample pretreatment methods include matrix solid-phase dispersion extraction, liquid-liquid extraction, solid-phase extraction (SPE), and solid-phase microextraction. Among these methods, SPE can better meet the analytical requirements of high recov...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J20/32B01J20/283B01D15/00
Inventor 冯钰锜赵琴尹佳卢倩蔡文静
Owner WUHAN UNIV