A flower-like mafic layered hydroxide microsphere-graphene composite material and its application

Abstract

The invention discloses a flower-shaped magnesium-iron layered hydroxide microsphere-graphene composite material and its application. The preparation method of the composite material comprises: preparing graphene oxide by adopting an improved Hummers method; ferric chloride, magnesium nitrate, Sodium dodecylsulfonate and graphene oxide described in step A are dispersed in ethylene glycol, thereby obtaining the first reaction liquid; NaOH is dissolved in ethylene glycol, thereby obtaining the second reaction liquid; The second reaction liquid into the first reaction liquid, and placed in the reaction temperature of 140-180 ° C for 20-24 hours, then cooled to room temperature, and then washed and dried, so as to prepare the flower-shaped magnesium-iron layered hydroxide micro Sphero‑graphene composites. The composite material can be used as a working electrode for detecting heavy metal ions in water. The invention not only can be used for rapid, efficient and selective on-site analysis and detection of heavy metal ions in water bodies, but also has good selectivity, wide linear range and low detection limit.

Description

technical field [0001] The invention relates to the technical field of pollutant detection in water bodies, in particular to a flower-shaped mafic-iron layered hydroxide microsphere-graphene composite material and its application. Background technique [0002] With the rapid development of modern industry, the problem of environmental pollution has become increasingly prominent, especially the problem of heavy metal pollution in water environment. As a highly toxic substance, heavy metals are not biodegradable, and will accumulate and amplify in organisms with the continuous enrichment of the food chain, thus posing a huge threat to humans, plants and animals. Therefore, a simple, fast, and Efficient analytical methods are of great significance for the accurate detection of heavy metal ions in water environment. [0003] At present, the methods for trace detection of heavy metals in water mainly include: atomic absorption spectrometry, inductively coupled plasma emission sp...

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Problems solved by technology

However, these traditional detection methods need to be carried out in the laboratory, the detection instruments used are expensive, the operation is complicated, the operation cost is high, and the samples need to be pre-treated, the processing process is cumbersome and time-consuming, which limits the analysis and detection of large quantities of samples. Various physical and chemical properties of samples may also change during the collection process, reducing the accuracy of detection, so these detection methods are difficult to apply to the on-site rapid detection of heavy metal ions

Compared with these detection methods, the electrochemical analysis method has the advantages of convenient operation, simple instrument, fast sensitivity, and high selectivity. Therefore, the electrochemical analysis method is widely used for on-site analysis and detection of heavy metal ions, but the existing electrochemical analysis method The detection range, lower detection limit and selectivity of the electrodes used for heavy metal ions in water are not ideal

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