Preparation method of organic phosphorus pesticide residue detection sensor based on copper/copper oxide nano-wires

Abstract

The present invention discloses a preparation method of an organic phosphorus pesticide residue detection sensor based on copper / copper oxide nano-wires. The preparation method comprises: (1) synthesizing copper nano-wires; (2) carrying out high temperature calcining to prepare copper oxide nano-wires; 3) preparing a copper nano-wire / graphene / chitosan complex; (4) preparing a copper oxide nano-wire / single-walled carbon nano-tube complex; (5) preparing a modified electrode; and (6) electrochemically detecting the organic phosphorus pesticide residue content. According to the present invention, the Cu / CuO nanometer material has good catalytic performance and excellent sensing performance, has special affinity for thiol-based compounds, can specifically test organic phosphorus pesticides, and further has advantages of low raw material cost and simple and easily-available raw materials, and the detection method is rapid, sensitive and convenient; with the good film forming property of the chitosan, the step for modifying the composite material onto the electrode surface is simplified so as to substantially reduce the electrode preparation cost; and the organic phosphorus pesticide residue is effectively adsorbed onto the electrode material surface by the single-walled carbon nano-tube to form a layer of the barrier for hindering the electron transfer so as to achieve the pesticide detection.

Description

technical field [0001] The invention belongs to the technical field of food detection, and in particular relates to a preparation method of an organophosphorus pesticide residue detection sensor based on copper / copper oxide nanowires. Background technique [0002] Pesticides are widely used in agricultural production to eliminate crop diseases, but their residues in the environment, water, crops, and food endanger human health and cause serious ecological, environmental, and food safety problems. At present, the most common pesticides used in my country are organophosphorus and carbamate pesticides. Once they enter the human body, they will produce the side effect of inhibiting the activity of cholinesterase, resulting in a large accumulation of the substrate acetylcholine on the nerve synapses. Destruction of the normal conduction of nerve impulses, even death in severe cases, poses a great threat to human health, and research on its detection methods is a research hotspot i...

AI Technical Summary

Problems solved by technology

[0004] A large number of literatures have reported the research on the application of various metals / metal oxides, metal / metal oxide-carbon nanotube composites, and bimetallic nanomaterials to pesticide residue detection sensors. Most of these studies focus on Ag, Au and other precious metals or ZrO 2 On the metal oxides whose preparation methods are cumbersome, there is less research on other metals / metal oxides with comparable performance, low cost, and easy availability.