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Synthesis and modification of mercapto-submicron scavenger for real-time extraction and preconcentration of As(III)

Synthesis and modification of mercapto-submicron scavenger for real-time extraction and preconcentration of As(III)
Synthesis and modification of mercapto-submicron scavenger for real-time extraction and preconcentration of As(III)

The gradual increase of arsenic in aquatic layers over the last decades has necessitated the early detection of low levels of arsenic on real time due to its hazardous impact on health. Here, the mercapto-submicron scavenger was synthesized and utilized for solid-phase dispersion extraction technique for real-time extraction and preconcentration of arsenite As(iii). Because of particle size, they naturally dispersed without the need for any additional power. The formation of particles and the achievement of the modification of the particles were confirmed by SEM, TEM, size distributions, CHN analysis, FT-IR spectroscopy, micro-Raman spectroscopy, X-ray photoelectron spectroscopy (XPS), zeta potential, energy dispersive X-ray analysis and (EDX) and thermogravimetric analysis (TGA), which confirmed the formation of particles in the size of 253 ± 34 nm, the chemical implantation of the mercapto groups on the surface was successfully accomplished with a loading of 0.281 mmol g-1. The particles showed proper dispersion and stability in the aqueous phase before and after being associated with As(iii). The chelating process between As(iii) and mercapto groups was assessed by XPS which confirmed that the mercapto-submicron scavenger can sequestrate As(iii) from water with maximum efficiency. Several factors that could optimize the process were assessed such as the effect of sorbent dose, pH, contact time, sample volumes, eluents, and matrix interference. The As(iii) calibration curve showed a positive linear correlation in the range of 0-100 μg L-1 and coefficient of determination (r2 = 0.9981). Optimum recovery was obtained with an equilibrium time of 30 min at pH = 8.5. It was found that the release of As(iii) from the mercapto-submicron scavenger was eluent dependent and the maximum recovery at the optimum conditions was 98 ± 3%. The average recovery of As(iii) from three different ground water locations was 97.15%.

1759-9660
245-255
Khdary, Nezar H.
44d14b89-e0ee-434f-8292-623ffbf6f046
Gassim, Ahmed E.H.
bab1a456-18ae-4706-a4bd-361b3480b838
Howard, Alan G.
620d87f5-647a-404c-834a-8d8dd09781dd
Sakthivel, Tamil S.
fef49b0b-ea39-4d2f-bd76-a20c6e78a871
Seal, Sudipta
f25e086d-ad5a-4527-bbfb-5d1d61cad2b3
Khdary, Nezar H.
44d14b89-e0ee-434f-8292-623ffbf6f046
Gassim, Ahmed E.H.
bab1a456-18ae-4706-a4bd-361b3480b838
Howard, Alan G.
620d87f5-647a-404c-834a-8d8dd09781dd
Sakthivel, Tamil S.
fef49b0b-ea39-4d2f-bd76-a20c6e78a871
Seal, Sudipta
f25e086d-ad5a-4527-bbfb-5d1d61cad2b3

Khdary, Nezar H., Gassim, Ahmed E.H., Howard, Alan G., Sakthivel, Tamil S. and Seal, Sudipta (2018) Synthesis and modification of mercapto-submicron scavenger for real-time extraction and preconcentration of As(III). Analytical Methods, 10 (2), 245-255. (doi:10.1039/c7ay02490h).

Record type: Article

Abstract

The gradual increase of arsenic in aquatic layers over the last decades has necessitated the early detection of low levels of arsenic on real time due to its hazardous impact on health. Here, the mercapto-submicron scavenger was synthesized and utilized for solid-phase dispersion extraction technique for real-time extraction and preconcentration of arsenite As(iii). Because of particle size, they naturally dispersed without the need for any additional power. The formation of particles and the achievement of the modification of the particles were confirmed by SEM, TEM, size distributions, CHN analysis, FT-IR spectroscopy, micro-Raman spectroscopy, X-ray photoelectron spectroscopy (XPS), zeta potential, energy dispersive X-ray analysis and (EDX) and thermogravimetric analysis (TGA), which confirmed the formation of particles in the size of 253 ± 34 nm, the chemical implantation of the mercapto groups on the surface was successfully accomplished with a loading of 0.281 mmol g-1. The particles showed proper dispersion and stability in the aqueous phase before and after being associated with As(iii). The chelating process between As(iii) and mercapto groups was assessed by XPS which confirmed that the mercapto-submicron scavenger can sequestrate As(iii) from water with maximum efficiency. Several factors that could optimize the process were assessed such as the effect of sorbent dose, pH, contact time, sample volumes, eluents, and matrix interference. The As(iii) calibration curve showed a positive linear correlation in the range of 0-100 μg L-1 and coefficient of determination (r2 = 0.9981). Optimum recovery was obtained with an equilibrium time of 30 min at pH = 8.5. It was found that the release of As(iii) from the mercapto-submicron scavenger was eluent dependent and the maximum recovery at the optimum conditions was 98 ± 3%. The average recovery of As(iii) from three different ground water locations was 97.15%.

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More information

Accepted/In Press date: 4 December 2017
e-pub ahead of print date: 20 December 2017
Published date: 14 January 2018

Identifiers

Local EPrints ID: 418902
URI: http://eprints.soton.ac.uk/id/eprint/418902
ISSN: 1759-9660
PURE UUID: b914d8a2-f1f9-4f93-990e-fba731188f24

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Date deposited: 23 Mar 2018 17:31
Last modified: 07 Oct 2020 00:55

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Contributors

Author: Nezar H. Khdary
Author: Ahmed E.H. Gassim
Author: Alan G. Howard
Author: Tamil S. Sakthivel
Author: Sudipta Seal

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