Masking agent-controlled discriminative Hg2+ and Cu2+ sensing by quinonediimine dye formation of aniline-functionalized silica nanoparticles

[Display omitted] •A discriminative Hg2+- and Cu2+-selective colorimetric sensing system was developed.•The signaling was due to the metal-assisted oxidative coupling of aniline with MBTH.•Immobilizing on silica nanoparticles enhanced user safety in handling toxic anilines.•Detection of Hg2+ and Cu2...

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Bibliographic Details
Published in:Sensors and actuators. B, Chemical Chemical, 2018-04, Vol.259, p.847-854
Main Authors: Kim, Da Bin, Lee, Kyung Hyun, Park, Ka Young, Ahn, Sangdoo, Chang, Suk-Kyu
Format: Article
Language:English
Subjects:
Cu2+ sensing
Discriminative signaling
Hg2+ sensing
Office scanner
Quinonediimine dye
Silica nanoparticles
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Summary:[Display omitted] •A discriminative Hg2+- and Cu2+-selective colorimetric sensing system was developed.•The signaling was due to the metal-assisted oxidative coupling of aniline with MBTH.•Immobilizing on silica nanoparticles enhanced user safety in handling toxic anilines.•Detection of Hg2+ and Cu2+ in wastewater was possible using an office scanner. A novel masking agent-controlled discriminative Hg2+- and Cu2+-selective reaction-based sensing system was investigated. Signaling was carried out by the metal-assisted oxidative coupling of aniline-functionalized silica nanoparticles with 3-methyl-2-benzothiazolinone hydrazone (MBTH) to yield a highly colored quinonediimine dye. The sensing system revealed prominent colorimetric signaling behavior towards Hg2+ and Cu2+ ions. Especially, discriminative signaling for cross-interfering Hg2+ and Cu2+ in the presence of their counterpart metal ions was accomplished using citrate and iodide, respectively, as corresponding masking agents. In addition, practical application to the determination of Hg2+ and Cu2+ in simulated semiconductor wastewater was achieved using a readily available office scanner as data capturing device, which is convenient for field application.
ISSN:0925-4005
1873-3077
DOI:10.1016/j.snb.2017.12.100