Electrochemical sensor for rapidly and efficiently detecting lead ions

A sensor and electrochemical technology, applied in the direction of material electrochemical variables, scientific instruments, instruments, etc., can solve the problems of low electrode detection sensitivity, limited electrocatalytic application, high electrode cost, etc., to achieve strong selectivity, high sensitivity, and low cost Effect

Active Publication Date: 2020-10-09
JIANGXI AGRICULTURAL UNIVERSITY
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] For pure MOFs, their poor stability and poor conductivity limit their application in electrocatalysis.
Some scholars have studied the determination of lead ions by cyclic voltammetry on Co / MOFs-pT modified electrodes (Journal of North University of China (Natural Science Edition) 2017, Volume 38, Issue 4, author Huang Hua, etc.), and Co / MOFs The particle composite modified glassy carbon electrode was used to measure the concentration of lead ions in acetate buffer solution by cyclic voltammetry, but the detection sensitivity of the electrode was low, and the detection limit was 0.12 μM, and it was modified with platinum particles. The cost of electrodes is too high

Method used

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  • Electrochemical sensor for rapidly and efficiently detecting lead ions
  • Electrochemical sensor for rapidly and efficiently detecting lead ions
  • Electrochemical sensor for rapidly and efficiently detecting lead ions

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Preparation of electrochemical sensors

[0035] 1. First, 0.15g Bi(NO) 3 ·5H 2 O and 0.75g H 3 BTC was added to the mixed solution of 60mL DMF and methanol. After sonication for 10 min, the mixture was sealed in a 100 mL Teflon-lined stainless steel autoclave and hydrothermally treated at 120 °C for 24 h. Then with DMF and CH 3 OH washed and centrifuged three times. After drying at 80 °C for 6 hours, Bi-MOFs were obtained.

[0036] 2. GCE / [Bi-MOFs / GO] 2 Preparation: Disperse Bi-MOFs in DMF at a concentration of 0.5 mg·mL -1 . GO was dispersed in DMF at a concentration of 1 mg mL -1 . 5 μL of Bi-MOFs solution was drop-coated on the surface of GCE, dried in an oven at 45 °C for 5 min, and then 5 μL of GO solution was dropped on the surface of GCE / Bi-MOFs. After drying, a Bi-MOFs / GO composite film was formed on the GCE. The above steps were repeated to obtain two-layer Bi-MOFs / GO composite modified GCE. Finally, the GCE / [Bi-MOFs / GO] 2 Reduction to get GCE / [Bi...

Embodiment 2

[0039] Detect the concentration of lead ions

[0040] Different concentrations (0.3nM, 7.0nM, 30.0nM, 0.5μM, 0.7μM, 0.9μM, 1.0μM, 2.0μM, 3.0μM, 5.0μM, 7.0μM, 9.0μM) of Pb 2+ The solution was added into the acetic acid buffer solution with a pH of 5.0, the electrochemical sensor prepared in Example 1 was connected to the test circuit, and the Pb was detected by differential pulse stripping voltammetry. 2+ Concentrations were measured as Pb 2+ The concentration is the abscissa (unit is μM), and the value of the peak dissolution current is the ordinate (unit is μA), to establish a standard curve y=2.19+9.28x (R 2 = 0.996).

[0041] Such as image 3 As shown, the modified electrode on Pb 2+ have a good linear relationship (R 2 =0.996), and has a wide linear range (0.3nM-9.0μM) and high sensitivity and low detection limit (0.1nM), which fully demonstrates that the sensing electrode can successfully detect unknown concentrations of Pb 2+ .

[0042] Using rGO, Bi-MOFs modified...

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Abstract

The invention discloses an electrochemical sensor for rapidly and efficiently detecting lead ions. Bi-MOFs and graphene oxide (GO) layers are constructed on the surface of a glassy carbon electrode (GCE) through a layer-by-layer (LbL) assembly technology, then GO in the composite material is subjected to electric reduction, and the two Bi-MOFs / GO layers in an insulating state are converted into two conductive Bi-MOFs / rGO layers. A Bi-MOFs / rGO modified glassy carbon electrode GCE / [Bi-MOFs / rGO] 2 is used as an electrochemical sensor, and Pb < 2 + > is subjected to electrochemical detection in anelectrolyte solution. The GCE / [Bi-MOFs / GO] 2 shows good detection sensitivity to Pb < 2 + >. The electrochemical sensor constructed by the invention can realize quantitative analysis of Pb < 2 + >, and can rapidly detect Pb < 2 + >.

Description

technical field [0001] The invention relates to the technical field of electrochemical sensors, in particular to an electrochemical sensor for fast and efficient detection of lead ions. Background technique [0002] Pb 2+ It is one of the most well-known toxic heavy metals, which can damage the functions of the nervous system, brain, hematopoietic system and liver even at low concentrations, causing various serious or fatal consequences. Infants and young children are at greater risk of lead poisoning than adults. Therefore, there is an urgent need to develop sensitive Pb 2+ Detection method. So far, various Pb 2+ Analytical strategies have been developed, such as inductive microprobes, atomic absorption / emission spectroscopy, voltammetric sensors, X-ray fluorescence spectroscopy, surface-enhanced Raman scattering, and colorimetric spectroscopy. Especially voltammetry, due to its simple operation, high sensitivity, low cost and portability, is the best choice for Pb 2+...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/30G01N27/48
CPCG01N27/308G01N27/48
Inventor 卢丽敏黄喜根陈尚钘邹锦高凤涂小龙
Owner JIANGXI AGRICULTURAL UNIVERSITY
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