Masking agent-controlled discriminative Hg2+ and Cu2+ sensing by quinonediimine dye formation of aniline-functionalized silica nanoparticles
Abstract A novel masking agent-controlled discriminative Hg 2+ - and Cu 2+ -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 Hg 2+ and Cu 2+ ions. Especially, discriminative signaling for cross-interfering Hg 2+ and Cu 2+ 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 Hg 2+ and Cu 2+ in simulated semiconductor wastewater was achieved using a readily available office scanner as data capturing device, which is convenient for field application. Highlights A discriminative Hg 2+ - and Cu 2+ -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 Hg 2+ and Cu 2+ in wastewater was possible using an office scanner. Graphical abstract [DISPLAY OMISSION]
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