Ultrasensitive and Selective Detection of Cd(II) Using ZnSe-Xanthan Gum Complex/CNT Modified Electrodes

作者：Ding, Yongling; Hao, Xiaojuan; Yin, Hong; Kyratzis, Ilias Louis; Shen, Shirley; Sun, Kangning^*; Liu, Futian^*; Musameh, Mustafa M.^*

来源：Electroanalysis, 2018, 30(5): 877-885.

DOI：10.1002/elan.201700763

• ZnSe
• Quantum dots
• Xanthan gum
• Cadmium ion
• MWCNT

This work describes for the first time the employment of water soluble GSH-ZnSe QDs stabilized by XG and MWCNT for electrode modification in the detection of Cd ions in a highly sensitive and selective manner resulting from the unique structure and surface chemistry of the used QDs. The surface of a glassy carbon (GC) electrode was modified through casting a thin layer of multiwalled carbon nanotubes (MWCNT) followed by a complex layer of ZnSe quantum dots (QDs) stabilized by xanthan gum (XG). Due to the electrocatalytic properties of MWCNT and electroanalytical performance of ZnSe-XG complex, the new modified electrode significantly improves the sensitivity and selectivity of Cd(II) detection and exhibits enhanced performance in comparison to bare GC, ZnSe/GC and ZnSe/MWCNT/GC electrodes. Strong interactions between ZnSe QDs and XG resulting from hydrogen bonding and complexing association led to stabilization of ZnSe QDs and higher affinity towards Cd(II) ions adsorption compared to a ZnSe QDs film alone. The modified electrode showed linear response in a wide concentration range from 100nM to 5M (R-2=0.9967) along with a high sensitivity of 156.6nAmol(-1)L(-1) and a low detection limit of 20nM. The electrode shows high selectivity to Cd with negligible interference from other metal ions and salts.

• 出版日期2018-5
• 单位齐鲁工业大学; 济南大学