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Manganese dioxide-polypyrrole composite electrode, preparation method thereof and application of manganese dioxide-polypyrrole composite electrode in heavy metal detection

A technology of manganese dioxide and composite electrodes, which is applied in the direction of measuring devices, electrochemical variables of materials, and material analysis through electromagnetic means, can solve the problems of unguaranteed detection accuracy and repeatability, long detection time, and high instrument cost, and achieve Avoid agglomeration and deactivation, low cost, and simple preparation process

Pending Publication Date: 2021-11-05
广州钰芯传感科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Currently recognized heavy metal analysis methods are: ultraviolet spectrophotometry (UV), atomic absorption (AAS), atomic fluorescence (AFS), inductively coupled plasma (ICP), X-ray fluorescence spectroscopy (XRF), inductively coupled plasma Mass spectrometry (ICP-MS), etc., but these detection methods have high instrument cost, complicated operation, long detection time, and detection accuracy and repeatability cannot be guaranteed

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  • Manganese dioxide-polypyrrole composite electrode, preparation method thereof and application of manganese dioxide-polypyrrole composite electrode in heavy metal detection
  • Manganese dioxide-polypyrrole composite electrode, preparation method thereof and application of manganese dioxide-polypyrrole composite electrode in heavy metal detection
  • Manganese dioxide-polypyrrole composite electrode, preparation method thereof and application of manganese dioxide-polypyrrole composite electrode in heavy metal detection

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Experimental program
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Effect test

Embodiment 1

[0047] Manganese dioxide - polypyrrole composite electrode:

[0048] S1, pre-treatment electrode: PI is selected substrate material, the substrate pretreatment PI, the PI is placed particularly acetone, sonicated for 5min, washed with deionized water and placed in 2.0M hydrochloric acid solution soaked 10min.

[0049] Preparation S2, Ni layer: a solution of nickel disposed electrodeposition, specifically consisting of: nickel sulfate 200g / L; Nickel chloride 20g / L; boric acid 20g / L; sodium dodecyl sulphate 0.1g / L; pH adjusted solution value of 3.0. Dual electrode constant current mode, titanium mesh electrode as an anode, a cathode as the PI, a temperature of 40 ℃, current density of 1.0A / dm 2 , Electrodeposition process 5min, Ni buffer layer is obtained.

[0050] S3, polypyrrole film prepared: Configuration polypyrrole solution, particularly consisting of: 30mmol / L pyrrole monomer, 0.1mol / L Na 2 SO 4 , 20mmol / L sodium dodecyl sulfate. The Ni / PI polypyrrole electr...

Embodiment 2

[0053] Manganese dioxide - polypyrrole composite electrode:

[0054] Sl, pre-treatment electrodes: After selecting ceramic substrate material, the substrate pretreatment ceramics, particularly ceramic substrate is placed in acetone and sonicated for 10min, removal of surface stain, rinsed with deionized water was placed in 4.0M hydrochloric acid solution soaking 15min, removal of the oxide layer, a roughened surface.

[0055] Preparation S2, Ni layer: a solution of nickel disposed electrodeposition, specifically composition: Nickel sulfate 300g / L; Nickel chloride 30g / L; boric acid 30g / L; sodium dodecyl sulphate 0.2g / L; pH adjusted solution value of 4.0. Dual electrode constant current mode, titanium mesh electrode as an anode, the ceramic substrate as a cathode, a temperature of 50 ℃, current density of 5.0A / dm 2 , Electrodeposition process 10min, Ni buffer layer is obtained.

[0056] S3, polypyrrole film prepared: Configuration polypyrrole solution, particularly consist...

Embodiment 3

[0059] Manganese dioxide - polypyrrole composite electrode:

[0060] Sl, electrode pretreatment: selecting silicon as the substrate material, the substrate pretreatment silicon, the silicon is placed particularly acetone, sonicated 8min, removing surface stains, washed with deionized water and placed in 3.0M hydrochloric acid solution soak 12min, removal of the oxide layer, a roughened surface.

[0061] Preparation S2, Ni layer: a solution of nickel disposed electrodeposition, specifically consisting of: nickel sulfate 250g / L; Nickel chloride 25g / L; boric acid 25g / L; sodium dodecyl sulphate 0.15g / L; pH adjusted solution value of 3.5. Dual electrode constant current mode, titanium mesh electrode as an anode, a silicon electrode as the cathode, a temperature of 45 ℃, current density of 3.0A / dm 2 , Electrodeposition process 8min, Ni buffer layer is obtained.

[0062] S3, polypyrrole film prepared: Configuration polypyrrole solution, particularly consisting of: 50mmol / L py...

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Abstract

The invention provides a manganese dioxide-polypyrrole composite electrode, a preparation method thereof and application of the manganese dioxide-polypyrrole composite electrode in heavy metal detection. An electrochemical in-situ modification method is adopted, a three-electrode system is adopted, and metal nickel, polypyrrole and manganese dioxide are modified on the surfaces of electrodes to form a composite electrode. According to the composite electrode, the polypyrrole with conductivity and the manganese oxide with good catalytic activity are compounded, so that the speed of ion transmission and electron transfer in the oxidation-reduction reaction process is greatly increased, the sensitivity of the electrode to metal ion detection is increased, and the detection limit is reduced. Meanwhile, due to the composite structure of the copolymer and the metal on the surface of the electrode, the stability of the electrode is improved, and the electrode can be recycled. The composite electrode can be used for simultaneously detecting trace Hg < 2 + >, Pb < 2 + > and Cu < 2 + > ions.

Description

Technical field [0001] The present invention belongs to the field of electrochemical sensors, particularly electrochemical detection of heavy metal ions in the art, it relates to a manganese dioxide - composite electrode preparation method and applications of polypyrrole in the detection of heavy metals. Background technique [0002] It refers to a heavy metal specific gravity greater than 5 metal, including gold, silver, copper, iron, lead and mercury. With the mining, smelting and processing of heavy metals from causing a lot of heavy metals into the atmosphere, water, soil, causing serious environmental pollution. As with the waste water discharge of heavy metals, even small concentrations, it can accumulate in algae and sediment, fish and shellfish are adsorbed surface, resulting concentrated food chain, thereby causing pollution. Strong interaction of heavy metals can occur in the human body and various enzymes and proteins, making them lose their activity, it may also be en...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/48G01N27/30
CPCG01N27/48G01N27/30G01N27/301
Inventor 奚亚男胡保帅崔皓博
Owner 广州钰芯传感科技有限公司
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