Three-electrode type Pb(II) and Cu(II) electrochemical sensor, and preparation method and application thereof

A three-electrode, electrochemical technology, applied in the fields of material electrochemical variables, scientific instruments, instruments, etc., can solve the problems of inability to meet popularization, inability to realize real-time monitoring, and bulky instruments, and achieve good recovery rate and potential application range. , The effect of high chemical stability

Active Publication Date: 2020-06-05
JILIN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, these optical methods usually require expensive instruments, good experimental conditions, and skilled experime...

Method used

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  • Three-electrode type Pb(II) and Cu(II) electrochemical sensor, and preparation method and application thereof
  • Three-electrode type Pb(II) and Cu(II) electrochemical sensor, and preparation method and application thereof
  • Three-electrode type Pb(II) and Cu(II) electrochemical sensor, and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Using the glassy carbon electrode as the working electrode, based on the three-electrode working system to produce Pb 2+ and Cu 2+ Electrochemical sensors, and test sensor-related performance, the specific process is as follows:

[0041] 1. Grinding the glassy carbon electrode: Before grinding the glassy carbon electrode, gently wipe the glassy carbon electrode with moistened absorbent cotton to remove dirt and ensure that the surface of the electrode is smooth; take a little 0.05μm polishing powder Al 2 o 3 Put it on the suede, then drop a small amount of deionized water, and stir it evenly with the polishing powder; hold the glassy carbon electrode firmly to ensure that the glassy carbon electrode is always vertically moving in a circular or "8" shape. Rotate clockwise and counterclockwise 100 times until the surface of the glassy carbon electrode appears mirror-like, and rinse with deionized water. The state of the glassy carbon electrode was detected by cyclic vo...

Embodiment 2

[0044] Use ZIF-67 as the electrode modification material to modify the glassy carbon electrode (GCE), that is, ZIF-67 / GCE as the working electrode, and make Pb 2+ and Cu 2+ Electrochemical sensor, its fabrication process is:

[0045] 1. The process of polishing the glassy carbon electrode is the same as that in Example 1.

[0046]2. Fabrication of ZIF-67 / GCE working electrode: first, ZIF-67 nanomaterials were prepared.

[0047] Weigh 4mmol Co(NO 3 ) 2 ·6H 2 O and 16mmol 2-methylimidazole, they were dissolved in the methanol of 100mL respectively, stirred evenly, then Co(NO 3 ) 2 The solution was poured into 2-methylimidazole, mixed and stirred evenly, and left to stand for 24 hours; the product was filtered with a microporous membrane, and finally dried at 30° C. for 24 hours to obtain ZIF-67 powder.

[0048] Use ZIF-67 as the electrode modification material, and modify it on the glassy carbon electrode: take 3 mg of ZIF-67 powder, add 2.4 mL of deionized water, and son...

Embodiment 3

[0051] Use ZIF-67 and MWCNT as electrode modification materials to modify glassy carbon electrode (GCE), that is, ZIF-67 / MWCNT / GCE as working electrode, and make Pb 2+ and Cu 2+ Electrochemical sensor, its fabrication process is:

[0052] 1. The process of polishing the glassy carbon electrode is the same as that in Example 1.

[0053] 2. Making ZIF-67 / MWCNT / GCE working electrode: first prepare ZIF-67 nanomaterials and pretreat MWCNT.

[0054] The preparation process of the ZIF-67 nanometer material is the same as in Example 2. The MWCNT pretreatment process is as follows: first, add 0.4gMWCNT to 20mL mixed concentrated sulfuric acid and concentrated nitric acid (the volume ratio of concentrated nitric acid and concentrated sulfuric acid is 1:3, and the mass fractions of concentrated nitric acid and concentrated sulfuric acid are 68% and 98% respectively) mixed acid solution. The suspension was then refluxed for 6 hours at 40°C with continuous stirring. It is then rinsed ...

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Abstract

The invention discloses a three-electrode type Pb(II) and Cu(II) electrochemical sensor, a preparation method and application of the electrochemical sensor in concentration detection of Pb(II) and Cu(II) in a liquid environment, and belongs to the technical field of heavy metal ion sensors. The sensor consists of a reference electrode AgCl/Ag, a counter electrode Pt sheet and a glassy carbon working electrode coated with an electrode modification material. ZIF-67, MWCNT and Nafion are used as working electrode modification materials. The ZIF-67 is rich in coordination defects and has good catalytic activity, the MWCNT has good conductivity, the Nafion is used as a selective permeable membrane, adsorption of heavy metal ions can be further enhanced, and the purpose of enhancing the mechanical stability of the sensor in a liquid environment is achieved. The sensor is an electrochemical sensor, is small in size and simple to operate, and is suitable for field analysis and detection. The prepared sensor has a good recovery rate in the detection of an actual water sample, which proves that the sensor has application potential in an actual environment.

Description

technical field [0001] The invention belongs to the technical field of heavy metal ion sensors, in particular to a three-electrode type Pb(II) and Cu(II) electrochemical sensor, a preparation method and its detection of Pb(II) and Cu(II) concentrations in a liquid environment application. Background technique [0002] The original meaning of heavy metal refers to the density greater than 4.5g / cm 3 However, in terms of environmental pollution, heavy metals mainly refer to heavy elements with significant biological toxicity such as mercury (mercury), cadmium, lead, chromium, and metalloid arsenic. Compared with organic toxic substances, heavy metal ions cannot be degraded in vivo. Therefore, with the step-by-step enrichment and amplification of the biological chain and the gradual accumulation in the human body, even trace amounts of heavy metal ions will pose a huge threat to human health. Lead ion is one of the most toxic heavy metal ions, which is very harmful to the hum...

Claims

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Application Information

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IPC IPC(8): G01N27/26G01N27/30G01N27/333
CPCG01N27/26G01N27/30G01N27/333
Inventor 梁喜双张月莹卢革宇于浩李为佳郝熙冬刘彤刘凤敏
Owner JILIN UNIV
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