Preparation amino functionalized graphene / chitosan composite and application of the composite to copper ion detection

Abstract

The invention provides an amino functionalized graphene / chitosan composite NH2-G / Cs for electrochemical detection of heavy metal copper ion, and belongs to the technical field of composite materials. Graphite oxide as a raw material and ammonia as a reducing agent and a nitrogen source are subjected to a hydrothermal one-step reaction to obtain amino functionalized graphene; and then the amino functionalized graphene is treated by ultrasound dispersion into an acetate buffer solution of chitosan to obtain the NH2-G / Cs. Electrochemical performance tests show that the glassy carbon electrode modified by the NH2-G / Cs composite prepared by the invention can be used to detect heavy metal copper ions, not only achieves highly selective detection of copper ions but also has the excellent performances, which a single electrode does not have, and the characteristics of high detection sensitivity and good stability. Further, the invention has the advantages of cheap and easily available raw materials, environment friendliness, simple preparation process and low cost; and the composite is an ideal choice for the electrode material of heavy metal copper ion sensors.

Description

technical field [0001] The present invention relates to a kind of amino functionalized graphene / chitosan (NH 2 -G / Cs) preparation of composite material; The present invention also relates to this NH 2 -The application of G / Cs composite material modified electrode to the detection of heavy metal copper ions in water samples belongs to the field of detection of composite materials and heavy metal copper ions. technical background [0002] With the vigorous development of chemical catalysis, heavy metal chemical industry, mechanical processing, metallurgy, electroplating and other industries, the problem of heavy metal pollution is becoming more and more serious. Copper, as one of the essential elements of the human body, has an impact on the growth of cells, the function of endocrine glands, the activities of human hematopoiesis and enzymes, etc. If excessive intake of copper or copper deficiency in the human body, it will cause some diseases to the human body. Copper also h...

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Problems solved by technology

However, in practical applications, the actual conductivity is not high due to its easy agglomeration or re-stacking in the solution.

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