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A working electrode and electrochemical sensor for selective detection of silver ions

A technology of working electrodes and silver ions, which is applied in the field of electrochemical analysis, can solve the problems that silver ions have no practical significance and no selectivity, and achieve the effects of improving electron transfer performance, high selectivity, and simple electrode modification methods

Active Publication Date: 2021-04-02
TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, in the actual chromogenic detection, due to the iron ion (Fe 3+ ) and silver ions (ie Ag + ), 3,3′,5,5′-tetramethylbenzidine (ie TMB) is not selective as a probe, making it detect silver ions (ie Ag + ) has no practical significance

Method used

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  • A working electrode and electrochemical sensor for selective detection of silver ions
  • A working electrode and electrochemical sensor for selective detection of silver ions
  • A working electrode and electrochemical sensor for selective detection of silver ions

Examples

Experimental program
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Effect test

Embodiment 1

[0046] A working electrode that can be used to selectively detect silver ions, comprising a glassy carbon electrode and a composite material modified on the surface of the glassy carbon electrode, the composite material including 3,3',5,5'-tetramethylbenzidine and graphite ene; wherein, the mass ratio of 3,3′,5,5′-tetramethylbenzidine to graphene is 1:1; the base electrode is a glassy carbon electrode.

[0047] The preparation method of above-mentioned working electrode is as follows:

[0048] 1) 3,3′,5,5′-Tetramethylbenzidine (TMB) was dissolved in N,N-dimethylformamide (DMF) to make 5mM solution A; graphene (ie Gr) Sonicate for 30 minutes, disperse in N,N-dimethylformamide (ie DMF) to make a 1mg / mL dispersion B; take 5mL of dispersion B and 5mL of solution A, mix, and place in an ice bath at 0°C Sonicate for 15 minutes, and finally centrifuge at a speed of 3000 rpm for 30 minutes to obtain a mixed solution C;

[0049] 2) Firstly, the glassy carbon electrode was polished wi...

Embodiment 2

[0052] A kind of electrochemical sensor, comprises the working electrode that embodiment 1 makes, opposite electrode and reference electrode; Wherein said opposite electrode is platinum wire, and described reference electrode is Ag / AgCl (saturated KCl solution) electrode.

[0053] Adopt above-mentioned electrochemical sensor to carry out electrochemical detection to silver ion:

[0054] Different concentrations of silver ions (i.e. Ag + ) into the sodium acetate buffer solution with a pH of 4.0, using the working electrode prepared in Example 1, utilizing differential pulse voltammetry to silver ions (i.e. Ag + ) for measurement, the linear increase of the peak current indicates that the sensing electrode can successfully detect silver ions of unknown concentration (i.e. Ag + ).

[0055] figure 2 with image 3 Respectively show that the electrochemical sensor of this embodiment detects different concentrations of silver ions (i.e. Ag + ) differential pulse voltammetry cu...

Embodiment 3

[0061] Detect the influence of the volume ratio of the solution A containing 3,3',5,5'-tetramethylbenzidine and the solution B containing graphene on the electrochemical sensor, that is, the preparation method of the working electrode is the same as in Example 1, except that The point is only to change the volume ratio of solution A and solution B.

[0062] Adopt the electrochemical sensor that comprises above-mentioned working electrode to carry out electrochemical detection to the silver ion that concentration is 200 μ M, wherein electrochemical sensor also comprises counter electrode and reference electrode; Wherein said counter electrode is platinum wire, and described reference electrode is Ag / AgCl (saturated KCl solution) electrode.

[0063] Detection method is with embodiment 2, and result is as shown in the following table:

[0064] Table 2. Relationship between volume ratio and peak current value

[0065] The volume ratio of solution A and solution B Pe...

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Abstract

The invention discloses a working electrode capable of selectively detecting silver ions. The working electrode comprises a substrate electrode and a composite material which is modified on the surface of the substrate electrode, and the composite material comprises 3,3', 5,5'-tetramethyl benzidine and graphene. The invention further discloses a preparation method of the working electrode. The preparation method comprises the following steps: coating the surface of the substrate electrode with a mixed solution comprising 3,3', 5,5'-tetramethyl benzidine, graphene and an organic solvent, and drying to obtain the working electrode. The invention further discloses an electrochemical sensor comprising the working electrode and application of the electrochemical sensor. By the electrochemical sensor based on a 3,3', 5,5'-tetramethyl benzidine-graphene modified electrode, highly selective detection on silver ions (Ag+) is realized, and the problem that non-selectivity exists when 3,3', 5,5'-tetramethyl benzidine (TMB) as a colorimetric probe detects metal ions is solved.

Description

technical field [0001] The invention relates to the technical field of electrochemical analysis. More specifically, it relates to a working electrode and an electrochemical sensor that can be used to selectively detect silver ions. Background technique [0002] In recent years, the detection of heavy metal ions is a very important issue in the fields of chemistry, environment, food safety, and biological samples. Silver is one of the most abundant metals on earth, and its compounds play a very important role in industry and daily life as antibacterial agents, catalysts, electronic devices, developers and jewelry. However, in the past few decades, tens of thousands of tons of silver ions (i.e. Ag + ) are continuously released in the environment around us, especially in developing countries. However, the high concentration of silver ions (i.e. Ag + ) will bring huge toxic hazards to humans and aquatic animals, especially by combining thiol bonds, amino bonds and carboxyl b...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N27/30G01N27/333G01N27/26
CPCG01N27/26G01N27/30G01N27/333
Inventor 只金芳付杨
Owner TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI
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