Electrochemical Properties of Sodium Selenite on a Bionic Membrane of Gold Electrode Modified by L-Cysteine Self-assembled Monolayer
- VernacularTitle:亚硒酸钠在L-半胱氨酸自组装类生物膜修饰电极上的电化学行为
- Author:
Jinfeng WEN
;
Aihua ZHU
;
Shengyun CUI
- Publication Type:Journal Article
- Keywords:
L-cysteine;
sodium selenite;
modified electrode;
nano selenium;
voltammetry
- From:
Chinese Journal of Analytical Chemistry
2009;37(12):1771-1775
- CountryChina
- Language:Chinese
-
Abstract:
The cyclic voltammetric behaviors of sodium selenite on the gold electrode modified by L-cysteine self-assembled monolayer (L-Syc,Au/SAMs) has been investigated in 0.05 mol/L H_2SO_4 solutions with sodium selenite. Sensitive anodic stripping current of selenium (Se) with the peak potential at 0.99 V (vs. SCE) has been observed. In comparison with the electrochemical properties of sodium selenite on the modified electrode with those on the naked gold electrode, it was found that selenite was reduced to selenium by the redox interaction with sulfur on the monolayer and the monolayer catalytically oxidizes Se as the electrode was positively scanned. According to the electrochemical properties of sodium selenite both on the naked and modified gold electrode, the Se deposition mechanism and catalytic mechanism as well as bionic membrane model were proposed for the bio-utilization of selenite through nano scale selenium.
