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Porous silica and polymer monolith architectures as solid-state optical chemosensors for Hg2+ ions

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Abstract

We demonstrate a simple strategy to concoct a competent solid-state opto-chemosensor for the selective and sensitive visual detection of Hg2+ ions. The sensor fabrication involves the utilization of indigenously prepared mesoporous silica and polymer monoliths as probe anchoring templates and 8-hydroxy-7-(4-n-butylphenylazo) quinoline (HBPQ) as the chromo-ionophoric probe for Hg2+ sensing. Both the monoliths are designed with discrete structural and morphological features to serve as efficient host templates. The structural and surface features of the monoliths are characterized using p-XRD, TEM, SEM, SAED, EDAX, XPS, and N2 isotherm analysis. The synergetic features of monolith structural hierarchy along with the probe’s selective chelating ability enable rapid signal response and remarkable ion selectivity for Hg2+. The solid-state sensors evince a linear signal response from 0.6 to 150 μg/L for Hg2+ recognition, with superior data authenticity and replication that is preceded by an RSD value of ≤ 2.25% when tested with real water samples.

Graphical abstract

Mesoporous silica and polymer monolith architects hosting HBPQ probe molecules demonstrate an excellent visual sensing of ultra-trace (μg/L) Hg2+ in various water samples with a striking color transition from light orange to dark red upon complexation of probe with Hg2+. The solid-state sensors are Hg2+ ion selective, super-responsive, real-time applicable, and also reusable.

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Acknowledgments

The authors are thankful to SERB for the financial support granted under Start-up Research Grant Scheme (Project File No. SB/FT/CS-091/2013) and VIT Vellore in the form of Institute Seed Grant for the financial year, 2019–2020. The authors also thank IIT-Madras and IISc Bangalore for the instrumentation facilities.

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  1. Department of Chemistry, School of Advanced Sciences, Vellore Institute of Technology (VIT), Vellore, Tamil Nadu, 632014, India

    Madhesan Thirumalai & Mohan Akhila Maheswari

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  1. Madhesan Thirumalai
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Correspondence to Mohan Akhila Maheswari.

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Madhesan, T., Mohan, A. Porous silica and polymer monolith architectures as solid-state optical chemosensors for Hg2+ ions. Anal Bioanal Chem 412, 7357–7370 (2020). https://doi.org/10.1007/s00216-020-02870-8

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  • DOI: https://doi.org/10.1007/s00216-020-02870-8

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