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A kind of silicon dioxide/polyfurfural modified electrode and its preparation method and application of detecting lead and cadmium ions

A technology of silica and modified electrodes, which is applied in the electrochemical field of composite modified electrodes and their preparation, electrochemical sensors, silica/polyfurfural composite modified electrodes and their preparation, and the detection of lead ions and cadmium ions. It can solve the problems that the detection limit needs to be improved, and achieve the effect of rapid detection of trace and ultra-trace heavy metals, stable performance, and simple construction method

Active Publication Date: 2020-09-29
QILU UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The working electrode can only detect one ion of lead, and the detection limit needs to be improved

Method used

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  • A kind of silicon dioxide/polyfurfural modified electrode and its preparation method and application of detecting lead and cadmium ions
  • A kind of silicon dioxide/polyfurfural modified electrode and its preparation method and application of detecting lead and cadmium ions
  • A kind of silicon dioxide/polyfurfural modified electrode and its preparation method and application of detecting lead and cadmium ions

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Furfural, sodium perchlorate (NaClO 4 ) and sodium hexafluorosilicate dissolved in acetonitrile aqueous solution with a mass concentration of 50% to form an electrolyte, the concentration of furfural is 0.05 mol / L, the concentration of sodium perchlorate is 0.06 mol / L, sodium hexafluorosilicate The concentration is 0.2mol / L.

[0040] Use 0.3μm and 0.05μm A1 respectively 2 0 3 The powder was used to polish the GCE electrode into a mirror surface, and then the electrodes were ultrasonicated in the order of ultrapure water, absolute ethanol, and ultrapure water for 5 minutes each, and then dried in nitrogen gas for later use. The treated bare GCE (glassy carbon electrode) was used as the working electrode, the Ag / AgCl electrode was used as the reference electrode, and the platinum wire electrode was used as the counter electrode. One end of the electrode is fixed in the electrolytic cell, and the other ends of the working electrode, the reference electrode and the count...

Embodiment 2

[0045] The above-mentioned porous silica / polyfurfural modified glassy carbon electrode can be used as a working electrode of an electrochemical sensor to detect the content of lead and cadmium ions. Described electrochemical sensor is made of working electrode, reference electrode, counter electrode, and described working electrode is the porous silica / polyfurfural modified glassy carbon electrode that embodiment 1 prepares, and reference electrode is Ag / AgCl electrode, to The electrodes are platinum wire electrodes.

[0046] The glassy carbon electrode modified with the porous silica / polyfurfural prepared in above-mentioned embodiment 1 is working electrode, measures the sensitivity of this electrode, and concrete method is as follows:

[0047] The silicon dioxide / polyfurfural membrane modified electrode was used as the working electrode, the silver / silver chloride electrode was used as the reference electrode, and the platinum electrode was used as the counter electrode. On...

Embodiment 3

[0055] The porous silica / polyfurfural-modified glassy carbon electrode prepared in the above-mentioned embodiment 1 is used as a working electrode, and the anti-interference property of the electrode is detected, and the specific method is as follows:

[0056] The silicon dioxide / polyfurfural membrane modified electrode was used as the working electrode, the silver / silver chloride electrode was used as the reference electrode, and the platinum electrode was used as the counter electrode. One end of the working electrode, reference electrode and counter electrode is fixed in the electrolytic cell, and the other ends of the three electrodes are respectively connected to the electrochemical workstation through wires, and the electrochemical workstation is connected to the computer.

[0057] Use acetic acid / sodium acetate buffer solution with pH=5.0 to prepare lead chloride, cadmium chloride, copper chloride, nickel chloride, ferric chloride, chromium chloride, cobalt chloride, chl...

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Abstract

The invention discloses a silica / polyfurfural-modified electrode, a preparation method thereof and application of detecting lead and cadmium ions. The modified electrode is prepared by depositing polyfurfural and silica on a glassy carbon electrode surface through cyclic voltammetry. The electrode preparation method of the invention is convenient and highly efficient, the obtained modified electrode has excellent electrocatalytic activity and selectivity on the lead and cadmium ions, simultaneous quantitative detection of the two types of ions can be realized, sensitivity is high, performanceis stable, and the modified electrode has very broad promotion and application prospects.

Description

technical field [0001] The invention relates to a composite material modified electrode and a preparation method thereof, in particular to a silicon dioxide / polyfurfural composite material modified electrode and a preparation method thereof, and also to an electrochemical sensor using the modified electrode as a working electrode and using it to detect lead ions The invention relates to an electrochemical method for cadmium ions and belongs to the technical field of lead cadmium ion monitoring. Background technique [0002] Heavy metal ions widely exist in various water bodies. They have the characteristics of trace toxicity, biomagnification, and difficulty in degradation in organisms. They are obviously harmful to human health. Therefore, research on heavy metal pollution control has become an important topic in environmental protection research. Lead and cadmium ions are one of the main sources of heavy metal pollution, which are extremely harmful to the environment and h...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N27/30G01N27/48
CPCG01N27/308G01N27/48
Inventor 方奕珊崔波陶海腾卢璐邹飞雪王娜
Owner QILU UNIV OF TECH
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