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Title: Titanium dioxide-graphene composite electrochemical sensor for detection of hexavalent chromium
Authors: Natpichan Pienutsa
Krittamet Yannawibut
Jetthana Phattharaphongmanee
Oukrit Thonganantakul
Sira Srinives
Mahidol University
Keywords: Earth and Planetary Sciences;Engineering;Materials Science
Issue Date: 1-Mar-2022
Citation: International Journal of Minerals, Metallurgy and Materials. Vol.29, No.3 (2022), 529-535
Abstract: Hexavalent chromium (Cr(VI)) compound is useful to various industries but is toxic and carcinogenic. In this research work, we fabricate an amperometric sensor for the determination of Cr(VI), using a titanium dioxide (TiO2)-reduced graphene oxide (rGO) composite as the sensing element. The composite was synthesized following sol—gel chemistry, yielding TiO2 nanoparticles of ∼50 nm in size, immobilized on chemically exfoliated rGO sheets. The composite was employed in a 3-electrode electrochemical cell and operated in an amperometric mode, exhibiting good responses to the 50 to 500 ppb Cr(VI). Our best result from pH 3 Mcilvane’s buffer medium reveals the sensitivity of 9.12 × 10−4 ppb−1 and a detection limit of 6 ppb with no signal interference from 200 ppm Ca(II), 150 ppm Mg(II), and 50 ppb Pb(II). The excellent results of the TiO2-rGO sensor can be attributed to synergic effects between TiO2 and rGO, resulting from the presence of n-p heterojunctions and the formation of the TiO2 nanoparticles on rGO.
ISSN: 1869103X
Appears in Collections:Scopus 2022

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