Competitive adsorption behavior toward metal ions on nano-Fe/Mg/Ni ternary layered double hydroxide proved by XPS: Evidence of selective and sensitive detection of Pb(II)

Journal of Hazardous Materials
Shan-Shan LiXing-Jiu Huang

Abstract

Hypersensitive and highly selective nanomaterials for the measurement of heavy metal ions (HMIs) hold a key to electro-analysis. Various works improved the results of analysis but without scientific understanding. Herein, Fe/Mg/Ni-layered double hydroxide (LDH) has been successfully prepared and its electrochemical behavior for Pb(II) detection is also studied using square wave anodic stripping voltammetry (SWASV). The well performance of electrochemistry suggest that the modification with Fe/Mg/Ni-LDH significantly promotes the selectivity and sensitivity toward Pb(II). The sensitivity on Fe/Mg/Ni-LDH modified glassy carbon electrode (GCE) is 68.1μAμM-1 over the range from 0.03 to 1.0μM under the optimized conditions. Otherwise, the selectivity, anti-interference, stability measurements and practical implications of Fe/Mg/Ni-LDH modified GCE are also performed. What,s more, a reasonable mechanism of detection for Pb(II) including selectivity and sensitivity is proposed based on adsorption and characterized using XPS and XRD. These findings provide a potentially excellent material to improve the sensitivity and selectivity for toxic metal ions as well as a deep understanding of detection.

Citations

Oct 4, 2018·Environmental Science and Pollution Research International·Waleed M A El RoubySafaa G Noaemy
Oct 20, 2020·International Journal of Biological Macromolecules·Maryam KonariMohammad Dinari
Dec 11, 2020·Journal of Hazardous Materials·Hao LiuYukihiro Ozaki
Jul 6, 2021·Chemical Communications : Chem Comm·Qi DingHua Kuang
Nov 12, 2021·Analytical Methods : Advancing Methods and Applications·Jingheng NingYongle Liu

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