Synthesis and characterization of gold nanoparticles for mercury adsorption

This research was carried out to synthesize and characterize different sizes and shapes of gold (Au) nanoparticles in order to find the optimum synthesis parameters for maximum mercury adsorption. The different sizes and shapes of Au nanoparticles were prepared using microwave (MW) polyol method. By...

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Main Author:	Mohamad, Mawarni Fazliana
Format:	Thesis
Language:	English
Published:	2012
Subjects:	TP Chemical technology
Online Access:	http://eprints.utm.my/id/eprint/81100/1/MawarniFazlianaMohamadMFPREE2012.pdf
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spelling	my-utm-ep.811002019-07-24T03:09:42Z Synthesis and characterization of gold nanoparticles for mercury adsorption 2012-05 Mohamad, Mawarni Fazliana TP Chemical technology This research was carried out to synthesize and characterize different sizes and shapes of gold (Au) nanoparticles in order to find the optimum synthesis parameters for maximum mercury adsorption. The different sizes and shapes of Au nanoparticles were prepared using microwave (MW) polyol method. By using different polyvinylpyrrolidone (PVP) concentrations (1.9-33.3 mM), different concentration of sodium chloride (NaCl) (10-30 mM) and different amount of [Au]1/[Au]0 molar ratio (1-9), different sizes and shapes of Au nanoparticles were obtained. The Au nanoparticles were characterized using ultra violet-visible (UVVis) absorption spectroscopy and transmission electron microscopy (TEM). The different sizes and various mixtures of spherical, triangular, cubic, hexagonal, octahedral, decahedral, icosahedral and one-dimension (1-D) particles were obtained using those methods. Mercury adsorption was determined based on different sizes and shapes of Au nanoparticles and measured using atomic absorption spectrophotometer (AAS). The optimum PVP concentration is 22.2 mM for 92 % spherical particles of a size in range less than 10 nm. It was found that, using 11.1 mM of PVP solution, the sizes and shapes can be further reduced in the presence of chloride ions. It was also found that, 20 mM of NaCl is sufficient to produce stable Au nanoparticles with most of the particles are spherical in which 97 % of particles diameter is less than 10 nm. The different of [Au]1/[Au]0 molar ratio led to the high yield of polygonal nanoparticles and the size is increase with increasing [Au]1/[Au]0 molar ratio. However, the optimum values of [Au]1/[Au]0 molar ratio cannot be determined because the sizes and shapes are irregular. High mercury adsorption was obtained for spherical nanoparticles (263.18 mg/g) with 99 % particles size less than 10 nm. The defect on spherical nanoparticles surface contributes to high mercury adsorption. In addition, smaller sizes of Au nanoparticles increase the total surface area available for mercury adsorption. It was found that the formation of sizes and shapes of Au nanoparticles was depend on parameters such as the concentration of PVP, NaCl, as well as [Au]1/[Au]0 molar ratio, and thus affects the mercury adsorption. 2012-05 Thesis http://eprints.utm.my/id/eprint/81100/ http://eprints.utm.my/id/eprint/81100/1/MawarniFazlianaMohamadMFPREE2012.pdf application/pdf en public http://dms.library.utm.my:8080/vital/access/manager/Repository/vital:119071 masters Universiti Teknologi Malaysia, Faculty of Petroleum and Renewable Energy Engineering Faculty of Petroleum and Renewable Energy Engineering
institution	Universiti Teknologi Malaysia
collection	UTM Institutional Repository
language	English
topic	TP Chemical technology
spellingShingle	TP Chemical technology Mohamad, Mawarni Fazliana Synthesis and characterization of gold nanoparticles for mercury adsorption
description	This research was carried out to synthesize and characterize different sizes and shapes of gold (Au) nanoparticles in order to find the optimum synthesis parameters for maximum mercury adsorption. The different sizes and shapes of Au nanoparticles were prepared using microwave (MW) polyol method. By using different polyvinylpyrrolidone (PVP) concentrations (1.9-33.3 mM), different concentration of sodium chloride (NaCl) (10-30 mM) and different amount of [Au]1/[Au]0 molar ratio (1-9), different sizes and shapes of Au nanoparticles were obtained. The Au nanoparticles were characterized using ultra violet-visible (UVVis) absorption spectroscopy and transmission electron microscopy (TEM). The different sizes and various mixtures of spherical, triangular, cubic, hexagonal, octahedral, decahedral, icosahedral and one-dimension (1-D) particles were obtained using those methods. Mercury adsorption was determined based on different sizes and shapes of Au nanoparticles and measured using atomic absorption spectrophotometer (AAS). The optimum PVP concentration is 22.2 mM for 92 % spherical particles of a size in range less than 10 nm. It was found that, using 11.1 mM of PVP solution, the sizes and shapes can be further reduced in the presence of chloride ions. It was also found that, 20 mM of NaCl is sufficient to produce stable Au nanoparticles with most of the particles are spherical in which 97 % of particles diameter is less than 10 nm. The different of [Au]1/[Au]0 molar ratio led to the high yield of polygonal nanoparticles and the size is increase with increasing [Au]1/[Au]0 molar ratio. However, the optimum values of [Au]1/[Au]0 molar ratio cannot be determined because the sizes and shapes are irregular. High mercury adsorption was obtained for spherical nanoparticles (263.18 mg/g) with 99 % particles size less than 10 nm. The defect on spherical nanoparticles surface contributes to high mercury adsorption. In addition, smaller sizes of Au nanoparticles increase the total surface area available for mercury adsorption. It was found that the formation of sizes and shapes of Au nanoparticles was depend on parameters such as the concentration of PVP, NaCl, as well as [Au]1/[Au]0 molar ratio, and thus affects the mercury adsorption.
format	Thesis
qualification_level	Master's degree
author	Mohamad, Mawarni Fazliana
author_facet	Mohamad, Mawarni Fazliana
author_sort	Mohamad, Mawarni Fazliana
title	Synthesis and characterization of gold nanoparticles for mercury adsorption
title_short	Synthesis and characterization of gold nanoparticles for mercury adsorption
title_full	Synthesis and characterization of gold nanoparticles for mercury adsorption
title_fullStr	Synthesis and characterization of gold nanoparticles for mercury adsorption
title_full_unstemmed	Synthesis and characterization of gold nanoparticles for mercury adsorption
title_sort	synthesis and characterization of gold nanoparticles for mercury adsorption
granting_institution	Universiti Teknologi Malaysia, Faculty of Petroleum and Renewable Energy Engineering
granting_department	Faculty of Petroleum and Renewable Energy Engineering
publishDate	2012
url	http://eprints.utm.my/id/eprint/81100/1/MawarniFazlianaMohamadMFPREE2012.pdf
_version_	1747818306927067136

Synthesis and characterization of gold nanoparticles for mercury adsorption

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