Scientists reveal different electrochemical behavioral differences in nanocrystalline iron oxide
Home > iron oxide news

The mechanism of electrochemical behavior of Fe2O3(iron oxide) nanoparticles was investigated by X-ray absorption fine structure energy spectrum (EXAFS) technique. The results are published in Analytical Chemistry (Anal. Chem. 2015. DOI: 10.1021 / acs.analchem.5b03570). Metal oxide micro / nanostructure materials have been favored by researchers because of their excellent properties, such as catalysis, adsorption and magnetism, and are widely used in the electrochemical detection of inorganic heavy metal ions. However, the enhancement mechanism of nanomaterials is not well understood, that is, no reasonable mechanism explanation is given from the atomic level. The electrochemical mechanism of nanomaterials is not well understood in electrochemical analytical methods, such as high sensitivity and low detection limit. The mechanism based on the atomic level plays an important role in the development of novel micro /nano-structured materials for the high sensitivity electrochemical detection of inorganic heavy metal ions in the water environment.

Based on the above-mentioned problems, the effects of different crystal phases on the electrochemical detection of Pb (II) by ferrous oxide (-and -Fe2O3) were discussed in detail, and their crystal structures were compared with adsorption capacity and adsorption The relationship between the electrochemical phenomena and the crystal structure is revealed from the atomic level. The results show that the electrochemical response of -Fe2O3 to Pb (II) is better than that of -Fe2O3 (Fig. Using XPS and EXAFS, we compared the adsorption and adsorption of -and -Fe2O3 to Pb (II). The results of XPS showed that a large amount of hydroxyl groups (-OH) were exposed on the surface of -Fe2O3, which could provide more adsorption sites and increase the adsorption capacity of Pb (II) due to the crystal structure of -Fe2O3. A large number of adsorption vacancies (Figure b). The results of EXAFS show that Pb (II) has different adsorption and binding modes on the surface of -and -Fe2O3. Pb (II) mainly binds Pb-OH and Pb-H2O on the surface of Fe2O3, Only Pb-OH (see Figures c and d). The different adsorption capacities and binding modes lead to a significant difference in the adsorption of Fe2O3(iron oxide) to Pb 2+ in different crystal phases, thus affecting the electrochemical behavior of Fe2O3(iron oxide) nanoparticles.

This work reveals the mechanism of the relative electrochemical behavior of the crystal from the atomic level, which is of great significance for understanding the relationship between the electrochemical behavior and the crystal phase. It provides an effective theory for the study of the new nano-materials for electrochemical detection stand by.

The research work has been the national major scientific research projects and the National Natural Science Fund and other projects support.

prevNano-iron oxide particles can be safely used in children with MRI enhancement

nextWhat are the applications of iron oxide powder?