Preparation method of Ce-MOF / CNHs-coated NBA / GCE electrode, electrochemical sensor and application of electrochemical sensor in detection of parathion-methyl

By modifying a glassy carbon electrode with Ce-MOF/CNHs@NBA composite material, a ratiometric electrochemical sensor is formed, which solves the problems of expensive, time-consuming and easily interfered instruments for the detection of methyl parathion in the prior art, and achieves rapid, sensitive and accurate detection results.

CN120891051APending Publication Date: 2025-11-04JIANGSU UNIV OF TECH
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Patent Information

Application Number
CN202511150896.6
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-08-18
Publication Date
2025-11-04

AI Technical Summary

Technical Problem

Existing technologies for the detection of methyl parathion are characterized by expensive instruments, long detection time, complex operation, and easily interfered results, making it difficult to meet the needs for rapid and accurate on-site detection.

Method used

A Ce-MOF/CNHs@NBA/GCE electrode is used. By modifying a glassy carbon electrode with Ce-MOF composite material, the high porosity and large specific surface area of ​​Ce-MOF, as well as the valence state transition characteristics of Ce3+/Ce4+, are utilized to combine the physical adsorption and chemical bonding of CNHs and NBA to form a stable composite material, thereby realizing a ratiometric electrochemical sensor with dual signal output.

Benefits of technology

It enables rapid, sensitive, and accurate detection of methyl parathion, with a wide linear range and low detection limit. It also exhibits excellent anti-interference and repeatability, making it suitable for agricultural product quality testing.

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Abstract

The invention discloses a preparation method of a Ce-MOF / CNHs (at) NBA / GCE electrode, an electrochemical sensor and application of the electrochemical sensor in detection of parathion-methyl. The preparation method comprises the following steps: sequentially polishing a glassy carbon electrode GCE to be smooth by using aluminum oxide powder with different particle sizes, sequentially carrying out ultrasonic treatment in ethanol and pure water to remove surface residues, and airing at room temperature; the preparation method comprises the following steps: adding single-walled carbon nanohorns (CNHs) powder and Nile blue A (NBA) powder into an aqueous solution, uniformly stirring at room temperature, centrifuging, washing and drying to obtain CNHs (at) NBA powder, preparing a mixed solution containing benzenetricarboxylic acid H3BTC and CNHs (at) NBA, adding cerous nitrate hexahydrate Ce (NO3) 3.6 H2O powder, stirring again, centrifuging, washing and drying to obtain a Ce-MOF / CNHs (at) NBA compound; the Ce-MOF / CNHs (at) NBA compound is dispersed in pure water, and a Ce-MOF / CNHs (at) NBA solution with the concentration being 0.2 mg / mL to 1 mg / mL is obtained; and dropwise adding a Ce-MOF / CNHs (at) NBA solution to the glassy carbon electrode GCE treated in the step (1), and airing at room temperature to obtain the Ce-MOF / CNHs (at) NBA / GCE electrode.
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