Determination of mercury(Ⅱ) using gold nanoparticles/ multi-walled carbon nanotubes composite modified glassy carbon electrode via cyclic voltammetry

• Main Authors: Huei-ting Jhuang, 莊惠婷
• Other Authors: Ching-Ju Chin
• Format: Others
• Language: zh-TW
• Published: 2015
• Online Access: http://ndltd.ncl.edu.tw/handle/46386123964659402106

碩士 === 國立中央大學 === 環境工程研究所 === 103 === The objective of this work was to prepare gold nanoparticles (GNP)/ multi-walled carbon nanotubes (MWCNTs) composite to modified glassy carbon electrode (GCE), which was used to analyze Hg (Ⅱ) by cyclic voltammetry (CV). It was found that modification via GNP/MWCNTs composite increased the active area. In order to investigate the influences of speciation on the reduction peak currents, CV was conducted at different solution pH and with addition of NaCl. When the solution pH was adjusted, the shift of the reduction peak of Hg was measured by all three modified electrodes. When NaCl was added, only the GCE electrode modified by 10-GNP/MWCNTs measured the shift of the reduction peak of Hg. These indicated that the CV by GNP/MWCNTs modified GCE electrodes can monitored the changes in speciation. Linear response between the reduction peak current and Hg concentration ranged from 1 ppb to 10 ppb has been found in all three modified electrodes This suggested that using GNP/MWCNTs modified GCE electrodes to analyze Hg concentration via cyclic voltammetry may be feasible.