Ionic liquid functional composite membrane modified electrode and preparation method and application thereof to detection of chlorophenol

A technology of ionic liquids and modified electrodes, which is used in measurement devices, electrochemical variables of materials, material analysis by electromagnetic means, etc., to achieve the effects of enhancing electrical conductivity, simple method operation, and improving specific surface area and electrical conductivity.

Active Publication Date: 2016-10-12
纳科利尔(山东)新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, ionic liquid-functionalized graphene-gold nanoparticle composites (IL-GR-AuNPs) are prepared by using amino-functionalized ionic liquids to perform epoxy ring-opening reaction on GO-AuNPs composites, and based on the complexes, membrane-modified electrodes and Its research on the detection of p-chlorophenol has not been reported yet

Method used

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  • Ionic liquid functional composite membrane modified electrode and preparation method and application thereof to detection of chlorophenol
  • Ionic liquid functional composite membrane modified electrode and preparation method and application thereof to detection of chlorophenol
  • Ionic liquid functional composite membrane modified electrode and preparation method and application thereof to detection of chlorophenol

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] (a) Preparation of AuNPs dispersion

[0034] Take 100mL of HAuCl with a mass concentration of 0.01% 4 Aqueous solution, heated to boiling, slowly added 1.5mL sodium citrate solution with a mass fraction of 1% under continuous stirring, continued stirring and heating and boiling for 15min, the solution turned purple and cooled to room temperature, and restored to the original volume with deionized water to obtain AuNPs Dispersions;

[0035] (b) Preparation of GO-AuNPs nanocomposites

[0036] GO was prepared by the hummer method, and a certain amount of GO was dispersed in water to make the concentration 5mg / mL, ultrasonically dispersed for 2 hours, and centrifuged at 3000rpm for 10min to remove undispersed GO to obtain a stripped GO dispersion; take 20mL of the GO Dispersion solution, slowly add 10mL of AuNPs dispersion solution dropwise under constant stirring, mix well and then stir for 12 hours under airtight conditions at room temperature, centrifuge at 5000rmp for...

Embodiment 2

[0042] (a) Preparation of AuNPs

[0043] Prepared according to the method and conditions in step (a) in Example 1;

[0044] (b) Preparation of GO-AuNPs nanocomposites

[0045] Prepared according to the method and conditions in step (b) in Example 1;

[0046] (c) Preparation of IL-GR-AuNPs composites

[0047] Weigh 20 mg of the GO-AuNPs composite obtained in step (b) and disperse it in 20 mL of deionized water, slowly add 10 mg IL and 10 mg KOH to it, and then sonicate for 30 min; heat, stir and reflux the sonicated dispersion at 80 °C for 24 h , the obtained product was centrifuged at 8000rmp for 5min, washed with water and absolute ethanol three times in turn, and the obtained black solid substance was the IL-GR-AuNPs complex;

[0048] (d) Preparation of IL-GR-AuNPs composite modified glassy carbon electrode

[0049] Prepare according to the method and conditions in step (d) in Example 1.

Embodiment 3

[0051] (a) Preparation of AuNPs

[0052] Prepared according to the method and conditions in step (a) in Example 1;

[0053] (b) Preparation of GO-AuNPs nanocomposites

[0054] Prepared according to the method and conditions in step (b) in Example 1;

[0055] (c) Preparation of IL-GR-AuNPs composites

[0056] Weigh 30 mg of the GO-AuNPs composite obtained in step (b) and disperse it in 20 mL of deionized water, slowly add 10 mg IL and 10 mg KOH to it, and then sonicate for 30 min; heat, stir and reflux the sonicated dispersion at 80 °C for 24 h , the obtained product was centrifuged at 8000rmp for 5min, washed with water and absolute ethanol three times in turn, and the obtained black solid substance was the IL-GR-AuNPs complex;

[0057] (d) Preparation of IL-GR-AuNPs composite modified glassy carbon electrode

[0058] Prepare the IL-GR-AuNPs composite material obtained in step (c) with deionized water into a slurry with a concentration of 1 mg / mL, take 10 μL of the slurry ...

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Abstract

The invention discloses an ionic liquid functional composite membrane modified electrode and a preparation method and application thereof to detection of chlorophenol. Special dissolution and high electrical conductivity of ionic liquid are utilized, amino functional ionic liquid conducts epoxide ring-opening on an oxidized graphene-gold nanoparticle composite, the ionic liquid functional graphene-gold nanoparticle composite is prepared, and a dispensing method is adopted to prepare the corresponding composite membrane modified electrode. The surface of the obtained modified electrode has the advantages of being large in effective area and good in dispersibility, and many active sites exist; the synergistic effect of ionic liquid, graphene and gold nanoparticles is played on the aspect of improving direct electrochemistry and electro-catalytic performance, and electrical conductivity and catalytic performance of the modified electrode are improved. An obtained chlorophenol sensor based on the composite membrane modified electrode has the advantages of being low in detection limit, wide in detection range, high in response speed and the like.

Description

Technical field: [0001] The invention relates to an ionic liquid functionalized composite membrane modified electrode and its preparation method and application; specifically refers to the preparation and electrochemical detection application of a glassy carbon electrode modified based on an ionic liquid functionalized graphene-gold nanoparticle composite membrane, and belongs to the field of environmental protection . Background technique: [0002] The content of chlorophenols in water is very low, but the P electrons in the chlorine atom and the π electrons on the benzene ring can form a stable conjugate system. Most of the chlorophenols are highly toxic and can accumulate in the biosphere through the food chain. It is difficult to biodegrade, has "three causes" (carcinogenic, teratogenic, mutagenic) effects and genotoxicity, and is a typical representative of persistent organic pollutants (Persistent Organic Pollutants, POPs) in the environment. The content of chlorophen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/30
CPCG01N27/308
Inventor 詹天荣谭正伟康敬霞
Owner 纳科利尔(山东)新材料科技有限公司
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