Synthesis of Cerium Oxide Nanoparticles and its Behavior under Aqueous Environmental Factors

Cerium oxide, CeO2 nanoparticles (NPs) are metal oxide NPs used in various applications such as in fuel oxidation catalysis, solar-driven energy production and as fuel additives. However, CeO2 NPs have been reported to behave differently when released to the environment due to the difference in pH,...

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Main Author:	Syazani Azaim, Eddie Halim
Format:	Thesis
Language:	English
Published:	2024
Subjects:	QD Chemistry
Online Access:	http://ir.unimas.my/id/eprint/46065/1/Syazani.A_Thesis.pdf
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spelling	my-unimas-ir.460652024-09-23T23:41:33Z Synthesis of Cerium Oxide Nanoparticles and its Behavior under Aqueous Environmental Factors 2024-08-30 Syazani Azaim, Eddie Halim QD Chemistry Cerium oxide, CeO2 nanoparticles (NPs) are metal oxide NPs used in various applications such as in fuel oxidation catalysis, solar-driven energy production and as fuel additives. However, CeO2 NPs have been reported to behave differently when released to the environment due to the difference in pH, ionic strength (IS) and concentration of natural organic matter (NOM). In this study, CeO2 NPs was synthesized using the hydrothermal method at 70 ℃ using cerium nitrate hexahydrate, Ce(NO3)3 • 6 H2O and sodium hydroxide, NaOH as the precursors while deionized water was used as the solvent. The synthesized CeO2 NPs were characterized using field emission scanning electron microscope (FESEM), transmission electron microscope (TEM), energy dispersive X-ray (EDX), ultraviolet visible (UV-Vis) spectrometer, Fourier transform infrared (FTIR) spectroscopy, X-Ray Diffraction (XRD) and Brunauer -Emmett-Teller (BET) method. High specific surface area of 185 m2/g, average particle size of (TEM: 3.5 nm, BET: 4.5 nm) and crystallite size of 3.05 nm was determined through the characterization process. The absorption peak at 305 nm and 447.20 cm-1 for UV-Vis and FTIR analyses respectively confirmed the presence of CeO2 NPs. The absence of impurities from EDX and XRD diffraction pattern proved that the synthesized CeO2 NPs was of high purity. The adsorption of HA on CeO2 NPs was performed using UVVis to measure the amount of HA adsorbed at the absorbance of 254 nm. Higher adsorption was observed at acidic pH compared to the alkaline pH and the adsorption was following the Pseudo-second order and Langmuir isotherm. The dissolution of CeO2 NPs was studied by measuring the dissolved Ce4+ using inductively coupled plasma-optical emission spectroscopy (ICP-OES). Increased in ionic concentration and pH was found to decrease the dissolution of CeO2 NPs while increased in HA concentration and pH resulted into a greater stability of CeO2 NPs. University Malaysia Sarawak 2024-08 Thesis http://ir.unimas.my/id/eprint/46065/ http://ir.unimas.my/id/eprint/46065/1/Syazani.A_Thesis.pdf text en public masters Universiti Malaysia Sarawak Chemistry
institution	Universiti Malaysia Sarawak
collection	UNIMAS Institutional Repository
language	English
topic	QD Chemistry
spellingShingle	QD Chemistry Syazani Azaim, Eddie Halim Synthesis of Cerium Oxide Nanoparticles and its Behavior under Aqueous Environmental Factors
description	Cerium oxide, CeO2 nanoparticles (NPs) are metal oxide NPs used in various applications such as in fuel oxidation catalysis, solar-driven energy production and as fuel additives. However, CeO2 NPs have been reported to behave differently when released to the environment due to the difference in pH, ionic strength (IS) and concentration of natural organic matter (NOM). In this study, CeO2 NPs was synthesized using the hydrothermal method at 70 ℃ using cerium nitrate hexahydrate, Ce(NO3)3 • 6 H2O and sodium hydroxide, NaOH as the precursors while deionized water was used as the solvent. The synthesized CeO2 NPs were characterized using field emission scanning electron microscope (FESEM), transmission electron microscope (TEM), energy dispersive X-ray (EDX), ultraviolet visible (UV-Vis) spectrometer, Fourier transform infrared (FTIR) spectroscopy, X-Ray Diffraction (XRD) and Brunauer -Emmett-Teller (BET) method. High specific surface area of 185 m2/g, average particle size of (TEM: 3.5 nm, BET: 4.5 nm) and crystallite size of 3.05 nm was determined through the characterization process. The absorption peak at 305 nm and 447.20 cm-1 for UV-Vis and FTIR analyses respectively confirmed the presence of CeO2 NPs. The absence of impurities from EDX and XRD diffraction pattern proved that the synthesized CeO2 NPs was of high purity. The adsorption of HA on CeO2 NPs was performed using UVVis to measure the amount of HA adsorbed at the absorbance of 254 nm. Higher adsorption was observed at acidic pH compared to the alkaline pH and the adsorption was following the Pseudo-second order and Langmuir isotherm. The dissolution of CeO2 NPs was studied by measuring the dissolved Ce4+ using inductively coupled plasma-optical emission spectroscopy (ICP-OES). Increased in ionic concentration and pH was found to decrease the dissolution of CeO2 NPs while increased in HA concentration and pH resulted into a greater stability of CeO2 NPs.
format	Thesis
qualification_level	Master's degree
author	Syazani Azaim, Eddie Halim
author_facet	Syazani Azaim, Eddie Halim
author_sort	Syazani Azaim, Eddie Halim
title	Synthesis of Cerium Oxide Nanoparticles and its Behavior under Aqueous Environmental Factors
title_short	Synthesis of Cerium Oxide Nanoparticles and its Behavior under Aqueous Environmental Factors
title_full	Synthesis of Cerium Oxide Nanoparticles and its Behavior under Aqueous Environmental Factors
title_fullStr	Synthesis of Cerium Oxide Nanoparticles and its Behavior under Aqueous Environmental Factors
title_full_unstemmed	Synthesis of Cerium Oxide Nanoparticles and its Behavior under Aqueous Environmental Factors
title_sort	synthesis of cerium oxide nanoparticles and its behavior under aqueous environmental factors
granting_institution	Universiti Malaysia Sarawak
granting_department	Chemistry
publishDate	2024
url	http://ir.unimas.my/id/eprint/46065/1/Syazani.A_Thesis.pdf
_version_	1811771587365437440

Synthesis of Cerium Oxide Nanoparticles and its Behavior under Aqueous Environmental Factors

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