Modification of screen printed carbon electrode with silicon nanowires for electrochemical detection of Hg(II) and Cd(II) in water

Water pollution resulting from heavy metal ions such as mercury and cadmium tends to have lethal effects on the environment and living organisms. This indicates the need for further research to develop on heavy metal sensors that are fast, potable and cost effective. In this research, Silicon Nanowi...

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Main Author: Mohamad Zain, Siti Nur Zawani
Format: Thesis
Language:English
Published: 2015
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Online Access:http://psasir.upm.edu.my/id/eprint/67730/1/FS%202015%2061%20IR.pdf
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spelling my-upm-ir.677302019-03-21T00:28:55Z Modification of screen printed carbon electrode with silicon nanowires for electrochemical detection of Hg(II) and Cd(II) in water 2015-05 Mohamad Zain, Siti Nur Zawani Water pollution resulting from heavy metal ions such as mercury and cadmium tends to have lethal effects on the environment and living organisms. This indicates the need for further research to develop on heavy metal sensors that are fast, potable and cost effective. In this research, Silicon Nanowires (SiNW’s), a 1-dimensional nanowire was used as a modifier for disposable screen printed carbon electrodes (SPCE) for detection of metal ions. The SiNW’s was characterized by different spectroscopic techniques and the application of SiNW’s on the surface of the electrode was found to increase the sensitivity of the electrode. The screen printed carbon electrode was modified by casting SiNW’s with 3-aminopropyl-triethoxysilane (APTES) onto the working electrode surface. The modified electrode (SiNW’s/APTES/SPCE) was then applied for Hg2+ and Cd2+ ion detection. Electrochemical studies using linear sweep stripping voltammetry performed with SiNW’s/APTES/SPCE were found to give a better response through the optimization of some analytical parameters. Concentration study of mercury with SiNW’s/SPCE gave linear calibrations and a detection limit value of 42.59 μg L−1 was achieved by applying deposition potential of -1.2V and deposition time of 160s. The electrode showed very good recovery indicating the accuracy of the method, while concentration study of cadmium with SiNW’s/SPCE gave a linear calibration with R2 = 0.994. A detection limit of 251.7 μg L−1 was also achieved by applying deposition potential of -1.2V and deposition time of 160s. Validation of the method with inductively coupled plasma-mass spectroscopy (ICP-MS) and atomic absorption spectroscopy showed very good correlation. This modified screen printed carbon electrodes with Silicon Nanowires (SiNW’s/APTES/SPCE) also found for simultaneously detection of Hg2+ and Cd2+ ions in the solution. Water - Pollution Electrochemical sensors Nanowires 2015-05 Thesis http://psasir.upm.edu.my/id/eprint/67730/ http://psasir.upm.edu.my/id/eprint/67730/1/FS%202015%2061%20IR.pdf text en public masters Universiti Putra Malaysia Water - Pollution Electrochemical sensors Nanowires
institution Universiti Putra Malaysia
collection PSAS Institutional Repository
language English
topic Water - Pollution
Electrochemical sensors
Nanowires
spellingShingle Water - Pollution
Electrochemical sensors
Nanowires
Mohamad Zain, Siti Nur Zawani
Modification of screen printed carbon electrode with silicon nanowires for electrochemical detection of Hg(II) and Cd(II) in water
description Water pollution resulting from heavy metal ions such as mercury and cadmium tends to have lethal effects on the environment and living organisms. This indicates the need for further research to develop on heavy metal sensors that are fast, potable and cost effective. In this research, Silicon Nanowires (SiNW’s), a 1-dimensional nanowire was used as a modifier for disposable screen printed carbon electrodes (SPCE) for detection of metal ions. The SiNW’s was characterized by different spectroscopic techniques and the application of SiNW’s on the surface of the electrode was found to increase the sensitivity of the electrode. The screen printed carbon electrode was modified by casting SiNW’s with 3-aminopropyl-triethoxysilane (APTES) onto the working electrode surface. The modified electrode (SiNW’s/APTES/SPCE) was then applied for Hg2+ and Cd2+ ion detection. Electrochemical studies using linear sweep stripping voltammetry performed with SiNW’s/APTES/SPCE were found to give a better response through the optimization of some analytical parameters. Concentration study of mercury with SiNW’s/SPCE gave linear calibrations and a detection limit value of 42.59 μg L−1 was achieved by applying deposition potential of -1.2V and deposition time of 160s. The electrode showed very good recovery indicating the accuracy of the method, while concentration study of cadmium with SiNW’s/SPCE gave a linear calibration with R2 = 0.994. A detection limit of 251.7 μg L−1 was also achieved by applying deposition potential of -1.2V and deposition time of 160s. Validation of the method with inductively coupled plasma-mass spectroscopy (ICP-MS) and atomic absorption spectroscopy showed very good correlation. This modified screen printed carbon electrodes with Silicon Nanowires (SiNW’s/APTES/SPCE) also found for simultaneously detection of Hg2+ and Cd2+ ions in the solution.
format Thesis
qualification_level Master's degree
author Mohamad Zain, Siti Nur Zawani
author_facet Mohamad Zain, Siti Nur Zawani
author_sort Mohamad Zain, Siti Nur Zawani
title Modification of screen printed carbon electrode with silicon nanowires for electrochemical detection of Hg(II) and Cd(II) in water
title_short Modification of screen printed carbon electrode with silicon nanowires for electrochemical detection of Hg(II) and Cd(II) in water
title_full Modification of screen printed carbon electrode with silicon nanowires for electrochemical detection of Hg(II) and Cd(II) in water
title_fullStr Modification of screen printed carbon electrode with silicon nanowires for electrochemical detection of Hg(II) and Cd(II) in water
title_full_unstemmed Modification of screen printed carbon electrode with silicon nanowires for electrochemical detection of Hg(II) and Cd(II) in water
title_sort modification of screen printed carbon electrode with silicon nanowires for electrochemical detection of hg(ii) and cd(ii) in water
granting_institution Universiti Putra Malaysia
publishDate 2015
url http://psasir.upm.edu.my/id/eprint/67730/1/FS%202015%2061%20IR.pdf
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