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Calcium alginate caged multiwalled carbon nanotubes for the pre-concentration of polycyclic aromatic hydrocarbons from environmental water samples

Monitoring of polycyclic aromatic hydrocarbons (PAHs) in water samples is important for human protection due to the carcinogenicity and mutagenicity of these compounds. A new technique termed dispersive micro solid phase extraction (D-µ-SPE) based on multiwalled carbon nanotubes (MWCNTs) caged in ca...

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Main Author: Abboud, Ayad Sami
Format: Thesis
Language:English
Published: 2015
Subjects:
QD Chemistry
Online Access:http://eprints.utm.my/id/eprint/53674/25/AyadSamiAbboudMFS2015.pdf
http://eprints.utm.my/id/eprint/53674/
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spelling my.utm.536742020-09-01T02:08:51Z http://eprints.utm.my/id/eprint/53674/ Calcium alginate caged multiwalled carbon nanotubes for the pre-concentration of polycyclic aromatic hydrocarbons from environmental water samples Abboud, Ayad Sami QD Chemistry Monitoring of polycyclic aromatic hydrocarbons (PAHs) in water samples is important for human protection due to the carcinogenicity and mutagenicity of these compounds. A new technique termed dispersive micro solid phase extraction (D-µ-SPE) based on multiwalled carbon nanotubes (MWCNTs) caged in calcium alginate (Ca+2-Alg) was developed and applied for efficient extraction of PAHs from environmental water samples. The prepared adsorbent (Ca-Alg-MWCNTs) was characterized by Fourier transform infrared spectroscopy, scanning electron microscopy and thermal gravimetry analysis. The hydrophilicity of the Ca+2-Alg cage enhances the dispersibility of the adsorbent in water samples and the MWCNTs core facilitates separation of PAHs. The composite beads not only make full use of the good PAHs adsorption properties of alginate and MWCNTs, but also prevent MWCNTs from breaking off from the composites to cause secondary micro-pollution to water. The proposed D-µ-SPE method was applied successfully for the extraction of selected PAHs from environmental water samples. The D-µ-SPE technique provides reasonable extraction time (30 min) to extract trace levels of PAHs from 100 mL of water samples with 100 mg of adsorbent. The extracted PAHs were desorbed by 0.1 mL of ethyl acetate to give enrichment factor of 1000. Under the optimized conditions, the detection limits for fluorene, phenanthrene and fluoranthrene were 0.42 ng mL-1, 0.3 ng mL-1 and 0.22 ng mL-1, respectively. The recoveries of several spiked real water samples for PAHs were in the range of 71.2-104.2% with good relative standard deviations (1.2% - 7.2%), showing good reproducibility of the method. The potential benefits of the D-µ-SPE using Ca-Alg-MWCNTs include high extraction efficiency, short analysis time and convenient extraction procedure. Thus D-µ-SPE method based on Ca-Alg-MWCNTs is a suitable candidate for use as an alternative adsorbent in the simultaneous pre-concentration of PAHs from environmental water samples. 2015-01 Thesis NonPeerReviewed application/pdf en http://eprints.utm.my/id/eprint/53674/25/AyadSamiAbboudMFS2015.pdf Abboud, Ayad Sami (2015) Calcium alginate caged multiwalled carbon nanotubes for the pre-concentration of polycyclic aromatic hydrocarbons from environmental water samples. Masters thesis, Universiti Teknologi Malaysia, Faculty of Science. http://dms.library.utm.my:8080/vital/access/manager/Repository/vital:85576
institution Universiti Teknologi Malaysia
building UTM Library
collection Institutional Repository
continent Asia
country Malaysia
content_provider Universiti Teknologi Malaysia
content_source UTM Institutional Repository
url_provider http://eprints.utm.my/
language English
topic QD Chemistry
spellingShingle QD Chemistry
Abboud, Ayad Sami
Calcium alginate caged multiwalled carbon nanotubes for the pre-concentration of polycyclic aromatic hydrocarbons from environmental water samples
description Monitoring of polycyclic aromatic hydrocarbons (PAHs) in water samples is important for human protection due to the carcinogenicity and mutagenicity of these compounds. A new technique termed dispersive micro solid phase extraction (D-µ-SPE) based on multiwalled carbon nanotubes (MWCNTs) caged in calcium alginate (Ca+2-Alg) was developed and applied for efficient extraction of PAHs from environmental water samples. The prepared adsorbent (Ca-Alg-MWCNTs) was characterized by Fourier transform infrared spectroscopy, scanning electron microscopy and thermal gravimetry analysis. The hydrophilicity of the Ca+2-Alg cage enhances the dispersibility of the adsorbent in water samples and the MWCNTs core facilitates separation of PAHs. The composite beads not only make full use of the good PAHs adsorption properties of alginate and MWCNTs, but also prevent MWCNTs from breaking off from the composites to cause secondary micro-pollution to water. The proposed D-µ-SPE method was applied successfully for the extraction of selected PAHs from environmental water samples. The D-µ-SPE technique provides reasonable extraction time (30 min) to extract trace levels of PAHs from 100 mL of water samples with 100 mg of adsorbent. The extracted PAHs were desorbed by 0.1 mL of ethyl acetate to give enrichment factor of 1000. Under the optimized conditions, the detection limits for fluorene, phenanthrene and fluoranthrene were 0.42 ng mL-1, 0.3 ng mL-1 and 0.22 ng mL-1, respectively. The recoveries of several spiked real water samples for PAHs were in the range of 71.2-104.2% with good relative standard deviations (1.2% - 7.2%), showing good reproducibility of the method. The potential benefits of the D-µ-SPE using Ca-Alg-MWCNTs include high extraction efficiency, short analysis time and convenient extraction procedure. Thus D-µ-SPE method based on Ca-Alg-MWCNTs is a suitable candidate for use as an alternative adsorbent in the simultaneous pre-concentration of PAHs from environmental water samples.
format Thesis
author Abboud, Ayad Sami
author_facet Abboud, Ayad Sami
author_sort Abboud, Ayad Sami
title Calcium alginate caged multiwalled carbon nanotubes for the pre-concentration of polycyclic aromatic hydrocarbons from environmental water samples
title_short Calcium alginate caged multiwalled carbon nanotubes for the pre-concentration of polycyclic aromatic hydrocarbons from environmental water samples
title_full Calcium alginate caged multiwalled carbon nanotubes for the pre-concentration of polycyclic aromatic hydrocarbons from environmental water samples
title_fullStr Calcium alginate caged multiwalled carbon nanotubes for the pre-concentration of polycyclic aromatic hydrocarbons from environmental water samples
title_full_unstemmed Calcium alginate caged multiwalled carbon nanotubes for the pre-concentration of polycyclic aromatic hydrocarbons from environmental water samples
title_sort calcium alginate caged multiwalled carbon nanotubes for the pre-concentration of polycyclic aromatic hydrocarbons from environmental water samples
publishDate 2015
url http://eprints.utm.my/id/eprint/53674/25/AyadSamiAbboudMFS2015.pdf
http://eprints.utm.my/id/eprint/53674/
http://dms.library.utm.my:8080/vital/access/manager/Repository/vital:85576
_version_ 1677781085659856896
score 13.211869

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