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A cobalt-nickel bimetallic sulfide organophosphorus pesticide biosensor and its preparation method

A technology of organophosphorus pesticides and biosensors, applied in instruments, scientific instruments, and electrochemical variables of materials, etc., can solve problems such as on-site and rapid analysis and monitoring of restricted environments and food contamination, complex sample pretreatment, and expensive instruments. Achieve high stability, good conductivity and low cost

Inactive Publication Date: 2018-10-16
XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] At present, the detection methods of organophosphorus pesticides mainly include high performance liquid chromatography, gas chromatography-mass spectrometry, fluorescence and surface plasmon resonance, etc. Although these methods have obtained high sensitivity, most of the instruments they use are expensive and Large size, long test period and complex sample pretreatment limit the on-site and rapid analysis and monitoring of environmental and food contamination

Method used

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  • A cobalt-nickel bimetallic sulfide organophosphorus pesticide biosensor and its preparation method
  • A cobalt-nickel bimetallic sulfide organophosphorus pesticide biosensor and its preparation method
  • A cobalt-nickel bimetallic sulfide organophosphorus pesticide biosensor and its preparation method

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Embodiment 1

[0055] The present embodiment provides a kind of preparation method of cobalt-nickel bimetallic sulfide, comprising the following steps:

[0056] Step 1, nickel acetate tetrahydrate and cobalt acetate tetrahydrate are dissolved in 40mL of ethylene glycol containing 60mg of cationic surfactant cetyltrimethylammonium bromide according to a certain molar ratio of 1:2, and ultrasonic vibration is completely dissolved to form a transparent Solution, then add the sulfur source compound thioacetamide, the molar ratio of the sulfur element in the thioacetamide to the nickel element in nickel acetate tetrahydrate can ensure that the sulfur source compound is sufficient or slightly excessive, and ensure that the sulfur source compound It can be completely dissolved in ethylene glycol, generally take (4-4.5): 1, continue to sonicate until it is completely dissolved to obtain a mixed solution; the ultrasonic intensity of ultrasonic oscillation is 100W.

[0057] Step 2, transfer the mixed ...

Embodiment 2

[0073] The present embodiment provides a kind of preparation method of cobalt-nickel bimetallic sulfide, comprising the following steps:

[0074] Step 1, the other conditions of this step are the same as in Example 1, the only difference is that the sulfur source compound is changed from thioacetamide to L-cysteine.

[0075] Step 2, this step is the same as the step of Example 1, and cobalt-nickel bimetallic sulfide is prepared.

[0076] Product characterization: The black powder prepared in this example was detected, and the energy spectrum and X-ray diffraction pattern were the same as those in Example 1.

[0077] The SEM image of the cobalt-nickel bimetallic sulfide prepared in this example is basically the same as the SEM image of the cobalt-nickel bimetallic sulfide prepared in Example 1, which is the morphology of network hollow microspheres.

Embodiment 3

[0085] The present embodiment provides a kind of preparation method of cobalt-nickel bimetallic sulfide, comprising the following steps:

[0086] Step 1, the other conditions of this step are the same as in Example 1, the only difference is that the sulfur source compound is changed from thioacetamide to thiourea.

[0087] Step 2, this step is the same as the step of Example 1, and cobalt-nickel bimetallic sulfide is obtained.

[0088] Product characterization: The black powder prepared in this example was detected, and the energy spectrum and X-ray diffraction pattern were the same as those in Example 1.

[0089]The SEM image of the cobalt-nickel bimetallic sulfide prepared in this example is basically the same as the SEM image of the cobalt-nickel bimetallic sulfide prepared in Example 1, which is the morphology of network hollow microspheres.

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Abstract

The invention provides a cobalt-nickel bimetallic sulfide organophosphorus pesticide biosensor and a preparation method thereof, comprising a carbon paste electrode and an acetylcholinesterase layer, and the modification layers on the surface of the carbon paste electrode are Nafion- NiCo2S4 layer, acetylcholinesterase layer and Nafion layer; the preparation method of described NiCo2S4 is: dissolve in ethylene glycol containing cationic surfactant with soluble nickel salt, soluble cobalt salt, make cobalt-nickel bimetallic by solvothermal method sulfide. The biosensor enzyme of the invention has good immobilization capacity, high sensitivity and high stability. The acetylcholinesterase can be immobilized on the electrode surface, thereby constructing the organophosphorus pesticide biosensor, which can be used for the detection of methyl parathion and paraoxon.

Description

technical field [0001] The invention belongs to the field of organophosphorus pesticides, and relates to a biosensor, in particular to a cobalt-nickel bimetallic sulfide organophosphorus pesticide biosensor and a preparation method. Background technique [0002] Transition metal sulfides such as CoS, NiS and MoS 2 Due to its special physical and chemical properties, it is widely used in many fields such as optoelectronics, magnetism and electrochemistry. As a new class of transition metal sulfide materials, ternary Co-Ni sulfides have excellent electrical conductivity compared with binary Co / Ni sulfides and ternary Co-Ni oxides. This is due to the low energy band gap of these materials. At present, the research on ternary Co-Ni sulfides mainly focuses on the discussion and research of synthesis methods and electrochemical applications. [0003] A nano-flaky cobalt-nickel bimetallic sulfide is disclosed in the prior art, and a nano-flaky cobalt-nickel bimetallic sulfide co...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N27/26G01N27/30
CPCG01N27/26G01N27/308
Inventor 彭磊董社英黄廷林
Owner XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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