Interaction mechanism between heavy metal ions and ternary intercalated nanomaterials revealed by Hefei materials

Recently, Huang Xingjiu, a researcher of the Institute of intelligent machinery, Hefei Institute of material science, Chinese Academy of Sciences, combined with XPS technology, has studied in detail the mechanism of interaction between heavy metal ions and Fe / mg / Ni ternary intercalation nanomaterials (Fe / mg / Ni LDH) and successfully realized the high selective detection of Pb (II) Relevant research results have been published in Journal of hazardous materials How heavy metal ions act on the surface of Fe / mg / Ni intercalation materials and how to realize the selective detection of Pb (II) (source: Hefei Institute of Materia Medica) due to the existence of a large number of coexisting ions in the actual water environment, how to achieve the highly sensitive and interference free detection of harmful heavy metal ions has always been a great challenge in the field of electrical analysis The previous work of the research group found that the electrochemical detection performance of nano materials for heavy metals is closely related to their adsorption performance for heavy metal ions However, there are still many deficiencies in the study of how to obtain nano materials with selective adsorption of heavy metal ions and the mechanism of their selective action The research group selected the iron based double hydroxy composite metal oxide intercalation material with excellent adsorption performance to construct the electrochemical sensitive interface and to detect the selectivity of Pb (II) The behavior of selective detection of Pb (II) in Fe / mg / Ni nanomaterials was studied by XPS The results show that different heavy metal ions have different interaction modes with metal hydroxyl bonds exposed on the surface of nano materials CD (II), Zn (II), Cu (II) and Hg (II) are the coexisting interference ions, most of which are combined with dissociated hydroxyl (- O -) in a non-specific electrostatic way, while Pb (II) is formed by m-o-pb (M = Fe, Mg, Ni) in a selective way In addition, under the optimal condition of detection, the undissolved hydroxyl group on the surface of Fe / mg / Ni LDH nanomaterials is significantly more than the dissociated hydroxyl group, which leads to the selective adsorption of different heavy metal ions, so as to realize the selective detection finally The researchers found that Fe / mg / Ni ternary intercalated nanomaterials can achieve high selectivity and noninterference detection of Pb (II) in water environment, and obtain high sensitivity (68.1 μ a μ m-1) and low detection limit (0.032 μ m) This work combines the adsorption performance and electrochemical behavior of nano materials for heavy metal ions, and provides a novel method for the development of new nano materials for the electrochemical analysis and detection of actual water body in the future Paper link: http://www.sciencedirect.com/science/article/pii/s0304389417303606