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Device for detecting lead ions

A polypyrrole and electrode technology, applied in the field of heavy metal detection, can solve the problems of unfavorable heavy metal enrichment, easy stacking, high sensitivity, etc., achieve excellent electrochemical performance, reduce experimental cost, and improve the effect of electrical conductivity

Inactive Publication Date: 2018-07-17
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

co 3 o 4 The nanosheet and nanosphere structures have been applied in the field of heavy metal detection, but these structures are prone to stacking, which is not conducive to the enrichment of heavy metals, and cannot obtain high sensitivity and low detection limit at the same time.

Method used

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  • Device for detecting lead ions
  • Device for detecting lead ions
  • Device for detecting lead ions

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Soak the foamed copper in hydrochloric acid, acetone, distilled water and absolute ethanol in sequence, and ultrasonically clean it to remove oil, oxide layer, insoluble matter, etc. on the foamed copper, and dry the foamed copper in a vacuum oven at 60°C for later use .

[0034] Cut the pretreated copper foam to a size of 1×2cm 2 As a substrate on which to grow Co 3 o 4 Precursor nanowire array structure. Weigh 0.58g of cobalt nitrate, 0.1389g of ammonium fluoride, and 0.56g of urea, add them into 40ml of distilled water, and stir for 10min to obtain a bright and uniform pink liquid. Pour this pink liquid into a hydrothermal kettle, and suspend the foamed copper in the pink liquid. At 100°C, hydrothermally react for 8 hours. After the reaction, take out the reactor and cool to room temperature. Take out the foamed copper substrate. You can see that there is a pink substance attached to the foamed copper substrate. Rinse repeatedly with distilled water and ethanol, an...

Embodiment 2

[0039] Soak the foamed copper in hydrochloric acid, acetone, distilled water and absolute ethanol in sequence, and ultrasonically clean it to remove oil, oxide layer, insoluble matter, etc. on the foamed copper, and dry the foamed copper in a vacuum oven at 60°C for later use .

[0040] Cut the pretreated copper foam to a size of 1×2cm 2 As a substrate on which to grow Co 3 o 4 Precursor nanowire array structure. Weigh 0.29g of cobalt nitrate, 0.1389g of ammonium fluoride, and 0.3g of urea, add them into 40ml of distilled water, stir for 10min, and obtain a bright and uniform pink liquid. Pour this pink liquid into a hydrothermal kettle, and suspend the foamed copper in the pink liquid. At 120°C, hydrothermally react for 5 hours. After the reaction, take out the reactor and cool to room temperature. Take out the foamed copper substrate. It can be seen that a pink substance is attached to the foamed copper substrate. Rinse repeatedly with distilled water and ethanol, and dr...

Embodiment 3

[0046] Soak the foamed copper in hydrochloric acid, acetone, distilled water and absolute ethanol in sequence, and ultrasonically clean it to remove oil, oxide layer, insoluble matter, etc. on the foamed copper, and dry the foamed copper in a vacuum oven at 70°C for later use .

[0047] Cut the pretreated copper foam to a size of 1×2cm 2 As a substrate on which to grow Co 3 o 4 Precursor nanowire array structure. Weigh 0.87g of cobalt nitrate, 0.074g of ammonium fluoride, and 0.3g of urea, add them into 40ml of distilled water, stir for 20min, and obtain a bright and uniform pink liquid. Pour this pink liquid into a hydrothermal kettle, and suspend the foamed copper in the pink liquid. At 80°C, hydrothermally reacted for 8 hours. After the reaction, the reactor was taken out to cool to room temperature, and the copper foam substrate was taken out. A pink substance was attached to the copper foam substrate. Rinse repeatedly with distilled water and ethanol, and dry at room ...

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Abstract

The invention discloses a device for detecting Pb<2+>. The device adopts a three-electrode system; a working electrode is a three-dimensional array electrode of a polypyrrole coated Co3O4 nanowire; anauxiliary electrode is a Pt wire electrode; a reference electrode is a Ag / AgCl electrode; acetic acid-sodium acetate serves as a buffer solution; the three-dimensional array electrode of the polypyrrole coated Co3O4 nanowire is a three-dimensional array prepared by taking foam copper as a base and loading polypyrrole coated Co3O4 nanowire on the base, the length of the Co3O4 nanowire is 1 to 1.8[mu]m, the diameter is 100 to 130 nm, the thickness of the polypyrrole coating layer is 10 to 15 nm, and the Co3O3 nanowire has a polycrystalline structure. The device reduces the experiment cost, issimple and convenient to operate, improves the conductivity of the Co3O4 by utilizing the three-dimensional array structure, increases the specific surface area and the active site of the electrode material, introduces the nitrogen-containing polypyrrole to further improve the conductivity of the electrode material, enables the nitrogen-containing group to be effectively complexed with the Pb<2+>,is favorable for Pb<2+> enrichment during detection, and further improves improvement on the Pb<2+> detection sensitivity and reduce on the detection limit by a sensor.

Description

technical field [0001] The invention relates to the field of heavy metal detection, more specifically, to a method for detecting Pb 2+ installation. Background technique [0002] At present, the methods for detecting heavy metals mainly include: flame emission spectrometry (FES), inductive particle combined plasma atomic emission spectrometry (ICP-AES), hydride generation atomic absorption spectrometry (HG-AAS), cold vapor atomic absorption spectrometry (CV -AAS), etc., but these traditional methods have expensive equipment, long detection cycle, bulky equipment, and more restrictions on the detection samples, which greatly limit the detection of lead ions. The electrochemical method has become an important research method for the detection of heavy metal ion concentration due to its rapidity, sensitivity, accuracy, convenient operation, and ease of miniaturization and networking. [0003] co 3 o 4 It is a p-type semiconductor material that has received extensive attenti...

Claims

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Application Information

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IPC IPC(8): G01N27/26G01N27/30
CPCG01N27/26G01N27/30
Inventor 许鑫华贾丽敏王文静张岩王超
Owner TIANJIN UNIV
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