Hefei Research Institute to Assess Electroanalysis Behavior of As(III) in Ultrathin Nanomaterials

Recently, Liu Jinhuai and Huang Xingji, researchers from the Institute of Intelligent Machinery of the Chinese Academy of Sciences' Institute of Materials Science and Technology, made progress in the analysis of ultra-thin nano-materials for enhanced As(III) detection electroanalytical behavior. This work has important scientific significance for revealing the electrochemical behavior of As(III) on ultra-thin nanomaterials. The related research results have been published in the Journal of Electrochemistry (Electrochimica Acta, 2016, 191, 142-148).

Electrochemical detection is widely used in the detection of As-like heavy metal contaminants due to its rapid, sensitive and portable characteristics. In electrode modification materials, nanostructured materials have been widely used to enhance electrochemical analysis signals. Ultrathin nanometer materials often have different electronic structures than corresponding bulk materials due to their thickness dimension and two-dimensional planar structure characteristics, which not only can affect their intrinsic properties, but also produce some new properties. Therefore, ultrathin nanometer materials are often widely used. Applied to electricity, optics, catalysis, etc., but its application in electrochemical detection is rarely reported.

In the previous work, the group found that ultra-thin ZrP obtained after stripping a-ZrP (a-zirconium phosphate) with poor conductivity can fully expose the active groups between the layers, greatly improving ZrP's Reactivity; Thin-layer ZrP modified electrode has good electrochemical detection effect on heavy metal ions, especially Pb (II) showed excellent selectivity (Anal. Chem. 2013, 85, 3984-3990). This work provides new ideas for investigating the research direction of ultra-thin nanomaterials for enhancing the electroanalytic behavior of As(III) detection. Based on this, researchers in the research group directly prepared ultra-thin tin dioxide nanoplates (thickness: 0.52 nm) with nanometer-scale thickness by simple hydrothermal method and modified them on electrodes to achieve drinking under near-neutral conditions. Sensitive detection of As (III) in water. Compared to bulk tin oxide, ultra-thin tin dioxide nanosheet modified electrodes exhibited better As(III) detection effect, which was mainly attributed to the fact that ultra-thin tin dioxide nanosheets could expose more reactive groups on their surface. Cluster and high activity crystal face (110). In addition, the system can be used to obtain ultra-thin tin dioxide nanosheets without the need for a cumbersome stripping process, and the modified electrode can overcome the strong acid conditions required for As(III) detection in the detection, and the sensitivity and detection limit are also Some precious metal material systems are equivalent.

The research work was supported by the National Major Scientific Research Project and the National Natural Science Foundation.

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