title: Bridged β-cyclodextrin-functionalized MWCNT with higher supramolecular recognition capability: the simultaneous electrochemical determination of three phenols.
abstract: A rapid and sensitive electrochemical sensor based on disulfides bridged β-cyclodextrin dimer-functionalized multi-walled carbon nanotube (DBβ-CD-MWCNT) nanohybrids with higher supramolecular recognition capability was successfully constructed for the first time. Simultaneous trace analysis of three phenols (4-aminophenol, 4-AP; 4-chlorophenol, 4-CP; 4-nitrophenol, 4-NP) in tap-water and wastewater samples was performed based on the constructed sensor. Cyclic voltammetry, differential pulse voltammetry, and electrochemical impedance spectroscopy were utilized to characterize the properties of the modified electrode. The proposed DBβ-CD-MWCNT-modified electrode displayed electrochemical signal superior to those of β-CD-MWCNT and MWCNT towards 4-AP, 4-CP, and 4-NP. Under optimal conditions, differential pulse voltammetry was used to simultaneously quantify 4-AP, 4-CP, and 4-NP within the concentration range of 0.01-20, 0.1-200, and 0.1-200 µM, respectively. The detection limits (S/N=3) of the DBβ-CD-MWCNT nanohybrid electrode for 4-AP, 4-CP, and 4-NP were 0.0042, 0.028, and 0.048 µM, respectively. Satisfactory results revealed that this proposed electrochemical sensor can provide a promising candidate for the simultaneous trace analysis of 4-AP, 4-CP, and 4-NP in environmental monitoring of water and wastewater samples. The present work might broaden the channel toward the application of bridged CD in the electrochemical sensing or biosensing.
authors: School of Chemical Science and Technology, Yunnan University, Kunming 650091, PR China.
authors: Long
authors: L
authors: Yang
authors: School of Chemical Science and Technology, Yunnan University, Kunming 650091, PR China.
authors: Shuangmei
authors: S
authors: Fan
authors: School of Chemical Science and Technology, Yunnan University, Kunming 650091, PR China.
authors: Guogang
authors: G
authors: Deng
authors: School of Chemical Science and Technology, Yunnan University, Kunming 650091, PR China.
authors: Yucong
authors: Y
authors: Li
authors: School of Chemical Science and Technology, Yunnan University, Kunming 650091, PR China.
authors: Xin
authors: X
authors: Ran
authors: Laboratory for Conservation and Utilization of Bio-resource, Yunnan University, Kunming 650091, PR China. Electronic address: zhaohyau@yahoo.com.cn.
authors: Hui
authors: H
authors: Zhao
authors: School of Chemical Science and Technology, Yunnan University, Kunming 650091, PR China. Electronic address: lcppp1974@sina.com.
authors: Can-Peng
authors: CP
authors: Li
mesh_terms: D000627:Aminophenols / Q000302:isolation & purification*; D015374:Biosensing Techniques / Q000379:methods*; D002733:Chlorophenols / Q000302:isolation & purification*; D058266:Dielectric Spectroscopy; D004784:Environmental Monitoring; D057230:Limit of Detection; D037742:Nanotubes, Carbon / Q000737:chemistry; D009596:Nitrophenols / Q000302:isolation & purification*; D047392:beta-Cyclodextrins / Q000737:chemistry
chemical_list: D000627:Aminophenols; D002733:Chlorophenols; D037742:Nanotubes, Carbon; D009596:Nitrophenols; D047392:beta-Cyclodextrins; C029107:4-chlorophenol; C031215:betadex; C026729:4-aminophenol; C024836:4-nitrophenol
keywords: Disulfides bridged β-cyclodextrin dimer; Multi-walled carbon nanotube; Phenols; Simultaneous determination; Supramolecular recognition