Nanocomposite materials for specific recognition of cadmium ions and their electrochemical sensors
A technology of nano-composite materials and cadmium ions, applied in the fields of nano-composite materials and electrochemical sensors, can solve the problems of low production cost and achieve the effects of low price, strong specificity and high detection sensitivity
Active Publication Date: 2019-08-02
HUNAN UNIV
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Gold nanoparticles are widely used in electrochemical detection due to their large specific surface area, good biocompatibility and excellent conductivity. Gold nanoparticles can enhance the electron transfer between biomolecules and redox centers on the electrode surface. , can also be used as a catalyst to increase the electrochemical reaction rate; graphene is a planar film composed of carbon atoms in a hexagonal honeycomb lattice with sp2 hybrid orbitals, and has excellent thermal, mechanical and electrochemical properties. Graphene has The huge specific surface area can be fully combined with metals, polymers and metal organics, so as to prepare nanocomposites with excellent electrical conductivity and stable structure, and the production cost is low, which is very suitable for the development of high-performance composite materials; porphyrin as A class of electron mediators with good electrocatalytic properties, because of their special chemical structure and properties have a specific response to metal ions; there is no related report to prepare graphite oxide by combining graphene oxide, gold nanoparticles, and tetraphenylporphyrin Alkene / gold nanoparticles / tetraphenylporphyrin composites, combined with electrochemical detection technology, to develop a novel high-selectivity and high-precision electrochemical sensor for the determination of cadmium ions in aqueous solutions
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[0036] The preparation method of the electrochemical sensor of the glassy carbon electrode modified by the graphene oxide / gold nanoparticle / tetraphenylporphyrin composite includes the following steps:
[0037] (1) Preparation of graphene oxide / gold nanoparticle composite: first disperse a certain amount of graphene oxide in ultrapure water, and ultrasonicate for 6 hours to prepare a yellow-brown graphene oxide solution with a concentration of 1 mg / mL; then take 10 ml of the above Graphene oxide solution and 0.04ml of 0.25M / L chloroauric acid solution are mixed in a round bottom flask, and 0.5M / L sodium hydroxide solution is added dropwise to the mixed solution until the pH is 10; After continuing to sonicate for 0.5h at room temperature, reflux for 1h at 100℃ to obtain a black dispersion. After centrifuging the above black dispersion at a speed of 13000rpm for 30min, remove the supernatant to obtain graphene oxide / gold with a concentration of 1mg / mL Nanoparticle composite;
[0038...
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The invention discloses a nano composite material for specifically identifying cadmium ions and an electrochemical sensor. Graphene oxide, gold nano particles and tetraphenylporphyrin are combined toplay a synergistic effect to prepare a graphene oxide / gold nano particle / tetraphenylporphyrin complex, and by combining an electrochemical detection technology, a novel electrochemical sensor with high selectivity and high accuracy is used for determining heavy metals, particularly the heavy metal cadmium in an aqueous solution, and is high in detection sensitivity, high in specificity, rapid, accurate, simple in operation, low in price, capable of avoiding the use of a large-sized instrument, and capable of performing the in-situ emergent detection.
Description
Technical field [0001] The invention belongs to the field of electrochemistry technology, and specifically relates to a nano composite material and an electrochemical sensor for specifically identifying cadmium ions. Background technique [0002] Heavy metals in the ecosystem exist indefinitely because of their non-biodegradability. They pose a great threat to human living environment and health. Heavy metal pollution was listed as a key pollutant by the United Nations Environment Program in 1974. Cadmium (Cd) is one of the most harmful heavy metals in heavy metal pollution. It is widely used in electroplating, nickel-cadmium batteries, alloys, pigments, phosphors, pesticides and other industries. Excessive cadmium causes serious water pollution, soil pollution and food Pollution. The World Health Organization proposes a 3ng / mL Cd(II) ion drinking water standard. Excessive intake of cadmium ions will cause damage to human organs such as liver, lung, kidney and prostate, and it w...
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IPC IPC(8): G01N27/30G01N27/36G01N27/327
CPCG01N27/308G01N27/3278G01N27/36
Inventor 李继山刘静司艳美刘志刚
Owner HUNAN UNIV