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Method for determining hydroquinone in wastewater by poly eosin Y modified glassy carbon electrode

A glassy carbon electrode, hydroquinone technology, applied in the field of electrochemical analysis, achieves the effect of wide linear range, low detection limit, and simple electrode preparation

Inactive Publication Date: 2019-02-15
HEZE UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Eosin Y modified glassy carbon electrode has not been reported for the determination of hydroquinone

Method used

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  • Method for determining hydroquinone in wastewater by poly eosin Y modified glassy carbon electrode
  • Method for determining hydroquinone in wastewater by poly eosin Y modified glassy carbon electrode
  • Method for determining hydroquinone in wastewater by poly eosin Y modified glassy carbon electrode

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] a. Pretreatment of glassy carbon electrode

[0034] Polishing powder (Al 2 O 3 Powder) is ground to a mirror surface, measured in the characterization solution by cyclic voltammetry, and then rinsed with water twice. When the redox peak potential difference is less than 0.07V and the two adjacent characterization curves basically overlap, the electrode is placed in 0.1mol / L of H 2 SO 4 In the voltage range of 0.4-0.6V, scanning 20 times at a scanning speed of 100mV / s to obtain a processed glassy carbon electrode.

[0035] b. Polyeosin Y modified glassy carbon electrode

[0036] Use acetate buffer solution with pH=7.0 to prepare a concentration of 1.0×10 -3 For the mol / L Eosin Y solution, pass nitrogen for 20 minutes before each use to remove the oxygen in the solution. In the voltage range of -1.2~1.5V, the eosin Y solution was scanned with different cycles of cyclic voltammetry at a scanning speed of 100mV / s.

[0037] As the number of scanning cycles increases, the current o...

Embodiment 2

[0039] In Example 2, a, the pretreatment of the glassy carbon electrode and b, the polyeosin Y modified glassy carbon electrode are the same as in Example 1. On the basis of Example 1, the pEY / GCE modified electrode is used as the working electrode, saturated calomel The electrode is the reference electrode, and the platinum wire electrode is the counter electrode. Within the potential range of -0.2~0.6V, in the acetate buffer solution of pH=5.0, scanning different concentrations of hydroquinone at a sweep rate of 100mV / s The cyclic voltammogram of the solution was recorded at the same time.

[0040] figure 2 1.0×10 -4 Cyclic voltammogram of mol / L hydroquinone on polyeosin Y modification. Curve a is the cyclic voltammetry curve of hydroquinone on a bare glassy carbon electrode. It can be seen from the figure that hydroquinone is on the electrode. There is a pair of good redox peaks, oxidation peak potential (E pa ) And reduction peak potential (E pc ) Are 0.27V and 0.145V resp...

Embodiment 3

[0043] The pretreatment of a, glassy carbon electrode and b, polyeosin Y modified glassy carbon electrode in Example 3 are the same as those in Examples 1 and 2. On the basis of Examples 1 and 2, other variables are fixed and the sweep speed is changed. To analyze the effect of scanning speed on the electrochemical behavior of hydroquinone.

[0044] Such as image 3 It is the cyclic voltammogram of hydroquinone on the modified electrode under different scanning speeds. Within the scanning speed range of 60~240mV / s, the pEY / GCE modified electrode pair is 1.0×10 -4 Cyclic voltammetry scanning of mol / L hydroquinone solution maintains good redox reversibility within this sweep speed range. The redox peak potential has a slight deviation during the entire scanning process ( image 3 ), indicating that there is weak adsorption on the electrode surface, so the sweep speed is selected as 100mV / s. Peak oxidation current (i pa ) And the square root of the sweep speed (v 1 / 2 ) And sweep spe...

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Abstract

The invention relates to the field of electrochemical analysis, in particular to a method for determining the hydroquinone in the wastewater by the poly eosin Y modified glassy carbon electrode. The eosin Y (EY) is modified to the surface of the glassy carbon electrode (GCE) by electropolymerization method, and a poly eosin Y modified electrode (pEY / GCE) is prepared, which has good electrocatalytic effect on hydroquinone. The electrochemical behavior of hydroquinone on the modified electrode was studied by cyclic voltammetry (CV). In a pH=5 acetate buffer solution, the concentration of hydroquinone showed a good linear relationship with its redox peak current in the range of 5.0x10-10~1.8x10-6mol / L, and the minimum detection concentration is 1.25x10-10mol / L.

Description

Technical field [0001] The invention relates to the field of electrochemical analysis, in particular to a method for measuring hydroquinone in wastewater by a polyeosin Y modified glassy carbon electrode. Background technique [0002] Hydroquinone is an indispensable raw material and by-product of many chemical industrial products. It is mainly used to prepare black and white developers, anthraquinone dyes, azo dyes, leather, medicines, pesticides, and antioxidants. Hydroquinone has strong toxicity at low concentrations. The adult lethal dose is 5.0g, and it is not easily degraded in the ecological environment. Therefore, a simple, accurate, convenient and rapid determination of hydroquinone content has been found The method is very important. The existing analytical methods for the determination of phenols include chemiluminescence, high performance liquid chromatography, spectrophotometry, capillary electrophoresis, electrochemical analysis and so on. The electrochemical anal...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/30
CPCG01N27/308
Inventor 王朝霞邹娜汪涛王学亮
Owner HEZE UNIV
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