tailieunhanh - Báo cáo hóa học: " Synthesis and Electrochemical Sensing Toward Heavy Metals of Bunch-like Bismuth Nanostructures"

Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Synthesis and Electrochemical Sensing Toward Heavy Metals of Bunch-like Bismuth Nanostructures | Nanoscale Res Lett 2010 5 398-402 DOI S11671-009-9495-3 NANO EXPRESS Synthesis and Electrochemical Sensing Toward Heavy Metals of Bunch-like Bismuth Nanostructures Zhi Zhang Ke Yu Dan Bai Ziqiang Zhu Received 16 October 2009 Accepted 16 November 2009 Published online 28 November 2009 The Author s 2009. This article is published with open access at Abstract Large-scale bunch-like bismuth Bi nanostructures were the first time to be synthesized via two-step electrochemical deposition. The growth mechanism of the nanostructures was discussed. Such a designed bunch-like Bi electrode has high sensitivity to detect the heavy metal ions due to its unique three-dimensional structures and strong ability of adsorbing the heavy metal ions. The bunch-like Bi electrode s detection of heavy metals was statically performed using anodic stripping voltammetry ASV . The detection in the Pb II concentration range of j-ig l was also performed. Based on the experimental results this bunch-like Bi electrode can be considered as an interesting alternative to common mercury electrodes and bismuth film electrodes for possible use in electrochemical studies and electroanalytical applications. Keywords Bismuth Nanostructure Electrochemical deposition Introduction Mercury electrode has gained wide acceptance for the electrochemical stripping analysis of heavy metal. However the toxicity of mercury and its difficulties in handling storage and disposal may severely restrict its use as an electrode material 1-5 . Recently a bismuth electrode as a favorable replacement for a mercury electrode has been introduced because of behavior similar to the mercury Z. Zhang K. Yu H D. Bai Z. Zhu Key Laboratory of Polar Materials and Devices Ministry of Education of China Department of Electronic Engineering East China Normal University 200062 Shanghai China e-mail yk5188@ electrode and the environmentally friendly nature of bismuth 6-10 . To date the research of the .