A multi-component composite material, electrochemical sensor and its application in detecting mercury ions in water

Abstract

The invention relates to a GS-Au / AuNPs / g-C3N4 composite material, an electrochemical sensor and the application of the GS-Au / AuNPs / g-C3N4 composite material and the electrochemical sensor in the detection of mercury ions in a water body. The composite material is prepared by the following methods of dispersing the carboxyl modified g-C3N4 powder into methanol, then adding glutathione and a chloroauric acid aqueous solution, carrying out ultrasonic treatment, carrying out heating reflux treatment for 12-24 hours after the ultrasonic treatment, separating, washing and drying to obtain GS-Au / AuNPs / g-C3N4. The electrochemical sensor comprises a substrate electrode and the GS-Au / AuNPs / g-C3N4 composite material, and the GS-Au / AuNPs / g-C3N4 composite material is attached to the substrate electrode. The electrochemical sensor prepared from the GS-Au / AuNPs / g-C3N4 composite material can detect the concentration of Hg ions in the water body with high sensitivity and high specificity.

Description

technical field [0001] The present invention relates to a GS-Au / AuNPs / g-C 3 N 4 The invention relates to a composite material, an electrochemical sensor and its application in detecting mercury ions in water, belonging to the technical field of mercury ion detection. Background technique [0002] The information disclosed in this background section is only intended to increase the understanding of the general background of the present invention, and is not necessarily taken as an acknowledgment or any form of suggestion that the information constitutes the prior art already known to those skilled in the art. [0003] Mercury is a heavy metal element that poses various hazards to human health. If it exists in natural water bodies, it will pose a threat to the health of humans and animals. It can accumulate in organisms and transfer to the human body through the food chain. The trace amounts of mercury accumulated in the human body cannot be excreted through its own metabol...

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Problems solved by technology

[0005] At present, the methods for detecting mercury ions mainly include: spectrophotometry, which is an analytical method based on the selective absorption of light by substances. Although this method has the advantages of simple experimental equipment, low instrument cost, and easy detection, it is widely used There are shortcomings such as long color development time; atomic emission spectrometry is an analytical technique for determining the composition and content of material elements according to the wavelength and intensity of the characteristic line spectrum emitted when the gaseous atoms of the substance to be measured are excited. It has the advantages of low detection limit and high measurement accuracy, but has the disadvantages of high requirements for instruments and expensive equipment; atomic absorption spectrometry is based on the ability of gaseous atoms to absorb the characteristic spectral radiation emitted by the same kind of atoms. The method of detecting the absorbance of the sample, the main limitation of this method is that it takes a long time and requires high equipment; it also includes biosensors, neutron activation method, high performance liquid chromatography, electrochemical method, etc., these methods The detection methods for heavy metal ions can provide lower detection limits, but there are still disadvantages such as poor selectivity, time-consuming, and complicated detection process.

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