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A preparation method of a pencil graphite modified electrode and a method for detecting hydroquinone isomers in water

A technology for modifying electrodes and quinone, which is applied in electrolytic coatings, electrochemical variables of materials, coatings, etc., can solve the problems of high reagent cost and complicated preparation methods, achieve high sensitivity and detection limit, simple preparation method, low cost effect

Active Publication Date: 2021-10-08
SHAANXI COAL & CHEM TECH INST
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Problems solved by technology

It can be seen from these literature reports that there are not many articles on the simultaneous detection of three diphenol isomers with electrochemically modified electrodes, and many of them can only detect two of the diphenol isomers at the same time. Some papers that can be detected at the same time also have problems such as cumbersome preparation methods and high cost of reagents used

Method used

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  • A preparation method of a pencil graphite modified electrode and a method for detecting hydroquinone isomers in water
  • A preparation method of a pencil graphite modified electrode and a method for detecting hydroquinone isomers in water
  • A preparation method of a pencil graphite modified electrode and a method for detecting hydroquinone isomers in water

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Embodiment 1

[0037] Embodiment 1: the preparation of pencil graphite electrode and the establishment of electrochemical analysis method

[0038]Construction of the electrochemical sensor: graphene oxide was ultrasonically dispersed in a perfluorinated resin solution with a mass concentration of 0.05%, and ultrasonicated for 20 min to obtain a 1 mg / mL graphene oxide suspension. Then immerse the graphite pencil electrode to be modified in it, immersion length: 15mm, perform electrochemical polymerization with cyclic voltammetry, potential scanning range -0.8V~1.2V, scanning rate 100mV / s, cycle scanning 20 times, dry, and use for later use .

[0039] Establishment of electrochemical analysis method:

[0040] The electrochemical test uses a modified graphite pencil electrode as the working electrode, a platinum wire electrode as the counter electrode, and an Ag / AgCl electrode as the reference electrode. All electrochemical tests are completed using a three-electrode system.

[0041] (1) Imme...

Embodiment 2

[0044] Example 2: Comparison of the effects of different types of electrodes on the determination of phenolic substances

[0045] Using bare pencil graphite electrode, bare glassy carbon electrode and modified pencil graphite electrode as working electrodes, Ag / AgCl electrode as reference electrode, and platinum wire electrode as counter electrode, the electrochemical analysis method established above was used to detect 50 μmol / L three A quinone solution. The result is as figure 1 As shown, the modified pencil graphite electrode has the highest detection sensitivity for the three quinones.

Embodiment 3

[0046] Embodiment 3: the impact of water body pH on the detection of three phenolic compounds

[0047] The influence of different pH on the electrochemical performance of detecting phenolic compounds was investigated, and the four conditions of pH=5.0, 6.0, 7.0, and 8.0 were investigated respectively. Prepare a mixed solution of 50 μmol / L of three quinones with prepared buffer solutions of different pH. The result obtained is as figure 2 shown. From figure 2 It can be seen from the figure that the sensitivity of testing the three quinones under the condition of pH=7.0 is the highest, so pH=7.0 is selected as the best test pH.

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Abstract

A method for preparing a pencil graphite modified electrode and a method for detecting hydroquinone isomers in a water body, the graphene oxide is ultrasonically dispersed in a perfluorinated resin solution, the graphene oxide suspension is obtained after ultrasonication, and then the graphite pencil electrode is Immerse in the graphene oxide suspension, and perform electrochemical polymerization by cyclic voltammetry to obtain a pencil graphite modified electrode. Using commercially available automatic pencil lead modified graphene as the working electrode can realize the simultaneous quantitative detection of the three quinone isomers, and the detection limit of the three phenolic compounds can reach 10 ‑6 mol / L, wide linear range, and has great application prospects for the detection of actual phenol-containing wastewater. The electrode prepared by the invention can not only detect three kinds of phenolic substances at the same time, but also has the advantages of low cost, high sensitivity and high detection limit.

Description

technical field [0001] The invention relates to a preparation method of a pencil graphite modified electrode and a method for detecting hydroquinone isomers in water, belonging to the technical field of rapid detection. Background technique [0002] The use of electrochemical methods to modify polymers or nanomaterials on electrodes has attracted extensive attention in the past few decades due to their excellent physical and chemical properties. When these polymers were peroxidized electrochemically, they showed better selectivity and sensitivity than before. Generally, the common techniques for preparing peroxidized polymers are cyclic voltammetry with multi-turn scanning or chronoamperometry under suitable potential conditions. However, these techniques have their own limitations, such as: longer duration of the oxidation process and issues such as polymer degradation. Based on these problems, it is necessary to find an alternative electrochemical analysis technique that...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25D15/00G01N27/30G01N27/48
CPCC25D15/00G01N27/30G01N27/48
Inventor 钱晓磊杨永忠
Owner SHAANXI COAL & CHEM TECH INST
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