Preparation of Electrospun ZnO-Carbon Composite Nanofiber Modified Electrodes for the Detection of Trace Lead
10.11895/j.issn.0253-3820.131235
- VernacularTitle:静电纺ZnO/碳复合纳米纤维修饰电极制备及对痕量铅的测定
- Author:
Xin ZHOU
;
Jianmao YANG
;
Meng XIN
;
Mengni CHEN
;
Xing WANG
;
Jianyun LIU
- Publication Type:Journal Article
- Keywords:
Electrospining technique;
Zinc oxide nanoparticle/carbon nanofiber;
Lead;
Square wave stripping voltammetry
- From:
Chinese Journal of Analytical Chemistry
2014;(7):985-990
- CountryChina
- Language:Chinese
-
Abstract:
ZnO nanoparticle-containing carbon composite nanofiber ( ZnO-CNF ) was prepared by the electrospinning of the ZnCl2-PAN precursor, followed by preoxidation and carbonization. The ZnO nanoparticles were uniformly distributed on the surface of the carbon nanofiber with the size of 20-30 nm, confirmed by scanning electron microscopy ( SEM ) . The wettability of the ZnO-CNF was studied by water contact angle test. With Nafion as an additive, the ZnO-CNF modified electrode was successfully constructed by dip-coating. The surface morphology and electrochemical properties of the modified electrode were investigated by SEM and cyclic voltammetry. There was a sensitive response of the ZnO-CNF modified electrode on Pb ions in solution, demonstrated by square wave stripping voltammetry. Under the optimized conditions, a good linear relationship between peak current and Pb2+concentration was obtained in the range of 2. 4×10-10-2. 4×10-7 mol/L (R=0. 998) by 10 min preconcentration at -1. 0 V in 0. 1 mol/L NaAc buffer solution (pH=4. 6). The detection limit was 4. 8×10-11 mol/L. The practical analytical application of the ZnO-CNF modified electrode was assessed by the measurement of the actual water sample and the result was consistent with that obtained by ICP-MS.
