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Carbon nanotube-modified electrode and preparation method thereof

A carbon nanotube and modified electrode technology, which is applied in the field of carbon nanotube modified electrode and its preparation, can solve the problems of simultaneous measurement difficulties, achieve high selectivity, improve the response current signal, and reduce the effect of oxidation potential

Inactive Publication Date: 2016-08-31
LUOYANG MINGLI TECH DEV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the structures of these three isomers are very similar, and the peak shapes often overlap during the electrochemical response, which brings difficulties to the simultaneous determination of these three isomers

Method used

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  • Carbon nanotube-modified electrode and preparation method thereof
  • Carbon nanotube-modified electrode and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0028] Cyclic voltammetry (CV) was used to investigate the effects of catechol, resorcinol and hydroquinone on (a) GCE, (b) ZnSe QDs / GCE, (c) MWNTs-Nafion / GCE and (d) Electrochemical behavior on ZnSeQDs / MWNTs-Nafion / GCE electrode. The result is as figure 2 As shown, on the GCE, two broad peaks appeared at the positions of 0.465V and 0.788V for dihydroxyphenol, the peak at 0.465V was caused by the overlapping of catechol and hydroquinone, and the peak at 0.788V was Peak due to resorcinol. However, after the electrode was modified with ZnSe QDs, there was no obvious catalytic effect. After modifying MWNTs-Nafion on the electrode, catechol, resorcinol and hydroquinone can be separated, corresponding to the peaks at 0.196V, 0.297V and 0.726V, indicating that MWNTs-Nafion hydrocatechol , resorcinol and hydroquinone have a good catalytic effect. When ZnSeQDs / MWNTs-Nafion was modified on the electrode, the peak currents of the three isomers were further increased, and the potent...

Embodiment 2

[0030] Optimize the ratio (mg / mL / mL) of MWNTs, Nafion, and ZnSe QDs in order to obtain the maximum response signal of the analyte. The ratio (mg / mL / mL) of MWNTs, Nafion, and ZnSe QDs is from 2:3: 1, 1:1:1 to 2:1:3, although the oxidation peak currents of catechol, resorcinol and hydroquinone increase with the content of ZnSe QDs, but considering that the response signal can be compared with The background current is well separated, and the ratio of the three is 1:1:1.

Embodiment 3

[0032] Investigate the effect of the amount of modified material dispensing on the response current. When MWNTs:ZnSe QDs:Nafion is 1:1:1, the dispensing amount of ZnSe QDs / MWNTs-Nafion on the electrode varies from 3μL, 5μL, 7μL, 10μL, 12μL When changing, it was found that the response current of dihydroxyphenol increased with the increase of the dispensing amount up to 10 μL, and then the response current basically remained unchanged.

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Abstract

The invention discloses a carbon nanotube-modified electrode and a preparation method thereof. The preparation method comprises modifying a glassy carbon electrode (GCE) through carbon nanotubes (MWNTs) and zinc selenide quantum dots (ZnSe QDs), wherein the carbon nanotubes, zinc selenide quantum dots and glassy carbon electrode are pre-treated before modification, mixing the treated carbon nanotubes, zinc selenide quantum dots and Nafion solution, carrying out ultrasonic treatment to obtain a uniform black mixed solution, dip-coating the treated glassy carbon electrode with the mixed solution and drying the glassy carbon electrode through an infrared lamp to obtain a ZnSe QDs / MWNTs-Nafion / GCE-modified electrode. The carbon nanotube-modified electrode has good catalytic activity and high selectivity to an object to be detected, improves a response current signal, is simple, fast, nontoxic and environmentally friendly and builds a novel method for simultaneous determination of pyrocatechol, resorcinol and hydroquinone.

Description

technical field [0001] The invention relates to the field of chemical electrode preparation, in particular to a carbon nanotube modified electrode capable of simultaneously measuring catechol, resorcinol and hydroquinone and a preparation method thereof. Background technique [0002] As three isomers of dihydroxybenzene, catechol (1,2-benzenediol, referred to as CC), resorcinol (1,3-benzenediol, referred to as RC) and hydroquinone Phenol (1,4-benzenediol, referred to as HQ) is widely used in daily life, mainly in cosmetics, leather, insecticides, spices, medicines, preservatives, fuels and photography. But at the same time, they are highly toxic and difficult to degrade organic substances, which are very harmful to the ecological environment and human health. The European Union and the U.S. Environmental Protection Agency list dihydroxybenzene as a class of environmental pollutants. my country (GB 8978-1996) clearly stipulates that the emission of phenolic compounds is less...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/30
Inventor 周军州
Owner LUOYANG MINGLI TECH DEV
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