Abstract
Biological toxicity and dangerous environmental pollution are inevitable when the level of Th4+ and Fe3+ exceeds the safety threshold. To address these problems, in this study, we report a dual-emission response chemosensor, HQCA, for rapid, sensitive, and selective detection of Th4+ and Fe3+ via colorimetric and fluorescence turn-on strategy. The absolute fluorescent "turn off" of HQCA, due to photoinduced electron transfer (PET), was immediately turned on with yellow fluorescence over the exposure to Th4+/Fe3+. The sensing capability of HQCA toward Th4+ and Fe3+ was studied in solution, and paper strips were fabricated with HQCA. Our results indicate excellent sensitivity and selectivity. Additionally, the value of emission intensity of HQCA had an excellent linear relationship with the concentration of Th4+/Fe3+, and the limit of detection (LOD) was found to be very low compared to reported methods and WHO norms. The interaction mechanism between HQCA and Th4+/Fe3+ was studied via Job's plot analysis, 1H NMR, Mass, and FT-IR analysis. Emission analysis of HQCA in the pH region 1–9 indicated that HQCA could successfully detect Th4+/Fe3+ in the pH region of 3–9. More importantly, the viability of HQCA to detect Th4+/Fe3+ ions were successfully tested in various water bodies and human serum albumin.
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