Facile synthesis of reduced graphene oxide/Fe3O4 nanocomposite for preconcentration and trace determination of tetracyclines and rare earth elements in water / Ungku Amirul Arif Ungku Abdullah

A green magnetic adsorbent, reduced graphene oxide/Fe3O4 nanocomposite, was synthesized via one-pot reaction method and characterized via X-Ray Diffraction, Field Emission Scanning Electron Microscope, Fourier-transform infrared spectroscopy, Energy Dispersive X-ray spectroscopy, Point of Zero Ch...

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Main Author:	Ungku Abdullah, Ungku Amirul Arif
Format:	Thesis
Language:	English
Published:	2021
Subjects:	Carbon disulfide Graphene Carbon
Online Access:	https://ir.uitm.edu.my/id/eprint/60555/1/60555.pdf
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spelling	my-uitm-ir.605552022-05-30T05:29:30Z Facile synthesis of reduced graphene oxide/Fe3O4 nanocomposite for preconcentration and trace determination of tetracyclines and rare earth elements in water / Ungku Amirul Arif Ungku Abdullah 2021-07 Ungku Abdullah, Ungku Amirul Arif Carbon disulfide. Graphene. Carbon A green magnetic adsorbent, reduced graphene oxide/Fe3O4 nanocomposite, was synthesized via one-pot reaction method and characterized via X-Ray Diffraction, Field Emission Scanning Electron Microscope, Fourier-transform infrared spectroscopy, Energy Dispersive X-ray spectroscopy, Point of Zero Charge and Vibrating-sample magnetometer. The adsorbent was used to develop magnetic solid-phase extraction (MSPE) technique for tetracycline antibiotics (TCAs) and rare earth elements (REEs) from water samples. The MSPE procedure for TCAs was optimised with respect to the necessary parameters; pH 4 for sample solution, 10 mg of adsorbent, 8 mL of sample, 5 min of extraction time, ethanol as the eluent and 2 min of desorption time. Under the optimised MSPE conditions, good linearity was achieved for the selected TCAs at concentrations ranging 0.05–1.0 mg L-1. The limit of detection and limit of quantification were 0.006–0.011 mg L-1 and 0.019–0.036 mg L-1, respectively. The intra-day and inter-day precisions were less than 3.38% and 5.59%, respectively. Satisfactory recoveries were obtained from real sample analysis ranging from 89.77– 106.33%. Meanwhile, the MSPE procedure for REEs was optimised with respect to the necessary parameters; sample solution at pH 4, 20 mg of adsorbent, 100 mL of sample, 5 min of extraction time, 0.5 M of HNO3 as the eluent and 3 min of desorption time. The method also revealed good linearity for the selected REEs, ranging from 10–1000 μg L-1. The limit of detection and limit of quantification were obtained in the range of 0.044–0.115 μg L-1 and 0.147–0.389 μg L-1, respectively. The intra-day and inter-day precisions were less than 3.87% and 4.21%, respectively. Satisfactory recoveries were obtained from real sample analysis ranging from 90.19–102.43%. Both analytes obeyed Langmuir adsorption isotherm model with adsorption capacity up to 52.64 and 53.56 mg g-1, respectively. The adsorbent can be reused up to 10 cycles without a significant loss of performance. 2021-07 Thesis https://ir.uitm.edu.my/id/eprint/60555/ https://ir.uitm.edu.my/id/eprint/60555/1/60555.pdf text en public masters Universiti Teknologi MARA Faculty of Applied Sciences Mohamad Hanapi, Suhaila (Prof. Madya Ts. ChM. Dr.)
institution	Universiti Teknologi MARA
collection	UiTM Institutional Repository
language	English
advisor	Mohamad Hanapi, Suhaila (Prof. Madya Ts. ChM. Dr.)
topic	Carbon disulfide Graphene Carbon
spellingShingle	Carbon disulfide Graphene Carbon Ungku Abdullah, Ungku Amirul Arif Facile synthesis of reduced graphene oxide/Fe3O4 nanocomposite for preconcentration and trace determination of tetracyclines and rare earth elements in water / Ungku Amirul Arif Ungku Abdullah
description	A green magnetic adsorbent, reduced graphene oxide/Fe3O4 nanocomposite, was synthesized via one-pot reaction method and characterized via X-Ray Diffraction, Field Emission Scanning Electron Microscope, Fourier-transform infrared spectroscopy, Energy Dispersive X-ray spectroscopy, Point of Zero Charge and Vibrating-sample magnetometer. The adsorbent was used to develop magnetic solid-phase extraction (MSPE) technique for tetracycline antibiotics (TCAs) and rare earth elements (REEs) from water samples. The MSPE procedure for TCAs was optimised with respect to the necessary parameters; pH 4 for sample solution, 10 mg of adsorbent, 8 mL of sample, 5 min of extraction time, ethanol as the eluent and 2 min of desorption time. Under the optimised MSPE conditions, good linearity was achieved for the selected TCAs at concentrations ranging 0.05–1.0 mg L-1. The limit of detection and limit of quantification were 0.006–0.011 mg L-1 and 0.019–0.036 mg L-1, respectively. The intra-day and inter-day precisions were less than 3.38% and 5.59%, respectively. Satisfactory recoveries were obtained from real sample analysis ranging from 89.77– 106.33%. Meanwhile, the MSPE procedure for REEs was optimised with respect to the necessary parameters; sample solution at pH 4, 20 mg of adsorbent, 100 mL of sample, 5 min of extraction time, 0.5 M of HNO3 as the eluent and 3 min of desorption time. The method also revealed good linearity for the selected REEs, ranging from 10–1000 μg L-1. The limit of detection and limit of quantification were obtained in the range of 0.044–0.115 μg L-1 and 0.147–0.389 μg L-1, respectively. The intra-day and inter-day precisions were less than 3.87% and 4.21%, respectively. Satisfactory recoveries were obtained from real sample analysis ranging from 90.19–102.43%. Both analytes obeyed Langmuir adsorption isotherm model with adsorption capacity up to 52.64 and 53.56 mg g-1, respectively. The adsorbent can be reused up to 10 cycles without a significant loss of performance.
format	Thesis
qualification_level	Master's degree
author	Ungku Abdullah, Ungku Amirul Arif
author_facet	Ungku Abdullah, Ungku Amirul Arif
author_sort	Ungku Abdullah, Ungku Amirul Arif
title	Facile synthesis of reduced graphene oxide/Fe3O4 nanocomposite for preconcentration and trace determination of tetracyclines and rare earth elements in water / Ungku Amirul Arif Ungku Abdullah
title_short	Facile synthesis of reduced graphene oxide/Fe3O4 nanocomposite for preconcentration and trace determination of tetracyclines and rare earth elements in water / Ungku Amirul Arif Ungku Abdullah
title_full	Facile synthesis of reduced graphene oxide/Fe3O4 nanocomposite for preconcentration and trace determination of tetracyclines and rare earth elements in water / Ungku Amirul Arif Ungku Abdullah
title_fullStr	Facile synthesis of reduced graphene oxide/Fe3O4 nanocomposite for preconcentration and trace determination of tetracyclines and rare earth elements in water / Ungku Amirul Arif Ungku Abdullah
title_full_unstemmed	Facile synthesis of reduced graphene oxide/Fe3O4 nanocomposite for preconcentration and trace determination of tetracyclines and rare earth elements in water / Ungku Amirul Arif Ungku Abdullah
title_sort	facile synthesis of reduced graphene oxide/fe3o4 nanocomposite for preconcentration and trace determination of tetracyclines and rare earth elements in water / ungku amirul arif ungku abdullah
granting_institution	Universiti Teknologi MARA
granting_department	Faculty of Applied Sciences
publishDate	2021
url	https://ir.uitm.edu.my/id/eprint/60555/1/60555.pdf
_version_	1783735143172669440

Facile synthesis of reduced graphene oxide/Fe3O4 nanocomposite for preconcentration and trace determination of tetracyclines and rare earth elements in water / Ungku Amirul Arif Ungku Abdullah

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