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An electrochemical sensor for detecting lead ions

A sensor and electrochemical technology, applied in the fields of electrochemical variables of materials, scientific instruments, instruments, etc., can solve the problems of low detection sensitivity of electrodes, limited electrocatalytic applications, and high cost of electrodes, and achieve strong selectivity, high sensitivity, and low cost. Effect

Active Publication Date: 2021-06-04
JIANGXI AGRICULTURAL UNIVERSITY
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  • Abstract
  • Description
  • Claims
  • Application Information

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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, Vol. 38, No. 4, author Huang Hua, etc.). 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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  • An electrochemical sensor for detecting lead ions
  • An electrochemical sensor for detecting lead ions
  • An electrochemical sensor for detecting lead ions

Examples

Experimental program
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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. Preparation of GCE / [Bi-MOFs / GO]2: 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 / [B...

Embodiment 2

[0039] Detect the concentration of lead ions

[0040] Different concentrations (0.3nM, 7nM, 30nM, 0.5μM, 0.7μM, 0.9μM, 1μM, 2μM, 3μM, 5μM, 7μM, 9μM) 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+ Concentration is the abscissa (unit is μ M), is ordinate (unit is μ A) with stripping peak current value, establishes 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 glassy carbon electrodes (i.e. rGO / G...

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Abstract

The invention discloses an electrochemical sensor for fast and efficient detection of lead ions. Bi-MOFs and graphene oxide (GO) layers are constructed on the surface of a glassy carbon electrode (GCE) through layer-by-layer (LbL) assembly technology, and then the composite material GO undergoes electroreduction to convert the insulating two-layer Bi-MOFs / GO layer into the conducting two-layer Bi-MOFs / rGO layer. Glassy Carbon Electrode GCE / [Bi‑MOFs / rGO] Modified with Bi‑MOFs / rGO 2 As an electrochemical sensor, Pb in the electrolyte solution 2+ Perform electrochemical detection. GCE / [Bi-MOFs / GO] 2 to Pb 2+ Good detection sensitivity was shown. The electrochemical sensor constructed in the present invention can realize the detection of Pb 2+ Quantitative analysis of Pb 2+ Do a quick test.

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 Patents(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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