Preparation of Zinc Oxide-Graphene Composite Modified Electrodes for Detection of Lead
10.11895/j.issn.0253-3820.150292
- VernacularTitle:氧化锌-石墨烯复合电极制备及其对重金属铅的灵敏检测
- Author:
Yuanyuan LU
;
Mengni CHEN
;
Yili GAO
;
Jianmao YANG
;
Xiaoyu MA
;
Jianyun LIU
- Publication Type:Journal Article
- Keywords:
Electrospining technique;
Zinc oxide;
Graphene;
Modified electrode;
Lead;
Square wave stripping voltammetry
- From:
Chinese Journal of Analytical Chemistry
2015;(9):1395-1401
- CountryChina
- Language:Chinese
-
Abstract:
ZnO nanotubes were prepared via electrospinning the Zn ( AC ) 2-polyacrylonitrile-polyvinylpyrrolidone ( PAN-PVP) precursor, followed by thermal decomposition of the above polymers from the precursor fibers. SEM and XRD characterization confirmed that the as-prepared ZnO nanofibers presented the hollow nanotube form, which was composed of ZnO nanoparticles with the size of about 40 nm in wurtzite crystal structure. By mixing with graphene, the obtained ZnO-graphene composite modified glassy carbon electrode ( ZnO-RGO/GCE ) was successfully constructed by dip-coating, which was used for the determination of Pb2+in water. With the sensitive response of the ZnO-RGO/GC electrode to Pb2+in solution was demonstrated by square wave stripping voltammetry, the response pctential was at -0. 4V. Under the optimized conditions, a good linear relationship between peak current and Pb2+ concentration was obtained in the range of 2. 4×10-9-4. 8×10-7 mol/L (R=0. 9970) by 10 min preconcentration at -1. 0 V in 0. 1 mol/L HAc-NaAc buffer solution (pH=4. 6). The detection limit was 4. 8×10-10 mol/L (S/N>3). The ZnO-RGO/GC electrode had good stability. The practical analytical application of the ZnO-RGO modified electrode was assessed by the measurement of the actual water sample and the result was consistent with that obtained by ICP-MS.
