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J. Korean Ceram. Soc. > Volume 58(3); 2021 > Article
Journal of the Korean Ceramic Society 2021;58(3): 314-329.
doi: https://doi.org/10.1007/s43207-020-00094-1
Highly efficient ultrasonic-assisted preconcentration of trace amounts of Ag(I), Pb(II), and Cd(II) ions using 3-mercaptopropyl trimethoxysilane-functionalized graphene oxide–magnetic nanoparticles
Natthida Lamaiphan1, Chinawooth Sakaew1, Phitchan Sricharoen2, Prawit Nuengmatcha3, Saksit Chanthai1, Nunticha Limchoowong4
1Department of Chemistry and Center of Excellence for Innovation in Chemistry, Materials Chemistry Research Center, Faculty of Science, Khon Kaen University, Khon Kaen 40002, Thailand
2Nuclear Research and Development Division, Thailand Institute of Nuclear Technology (Public Organization), 9/9 Moo 7, Tambon Saimoon, Ongkharak, Nakhon Nayok 26120, Thailand
3Nanomaterials Chemistry Research Unit, Department of Chemistry, Faculty of Science and Technology, Nakhon Si Thammarat Rajabhat University, Nakhon Si Thammarat 80280, Thailand
4Department of Chemistry, Faculty of Science, Srinakharinwirot University, Bangkok 10110, Thailand
Correspondence  Saksit Chanthai ,Email: sakcha2@kku.ac.th
Nunticha Limchoowong ,Email: nuntichoo@gmail.com
Received: August 17, 2020; Revised: October 2, 2020   Accepted: October 28, 2020.  Published online: May 31, 2021.
The preparation and characterization of thiol-functionalized graphene oxide–iron oxide (Fe3O4–GO–SH) nanocomposites (novel magnetic adsorbents) for the simultaneous preconcentration and determination of heavy metal ions, such as Ag(I), Pb(II), and Cd(II), from water samples were carried out in the present research. The characterization of the resultant Fe3O4–GO–SH nanocomposites was performed by SEM, TEM, EDX, XRD, FT-IR, and VSM. The preconcentration optimization of pH solution, adsorbent amount, ultrasonic power for adsorption and desorption processes, adsorption time, and elution solvent type and concentration was performed by the ultrasonic-assisted magnetic solid-phase extraction. Under optimal conditions, linear ranges were found to be 20–1000 μg L–1 for Ag(I) and Cd(II) ions and 200–10,000 μg L–1 for Pb(II) ions with a regression coefficient of R2 > 0.99. The limits of detection for Ag, Pb, and Cd ions were 1.7 μg L–1, 14.1 μg L–1, and 0.9 μg L–1, respectively, and the limits of quantification for Ag, Pb, and Cd ions were 5.9 μg L–1, 47.3 μg L–1, and 3.2 μg L–1, respectively. The recovery rate of these metal ions for water samples (drinking water, tap water, swamp water, and wastewater from plating plants) ranged between 80 and 115%. Therefore, the proposed method can potentially be used for the simultaneous preconcentration and determination of heavy metal ions from real water samples, and its reusability can be easily carried out by the deionized water treatment.
Key words: Ultrasound · Magnetic solid-phase microextraction · Heavy metals · Graphene oxide · Thiol-functionalization · Fe3O4
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