A New Molecular Probe for Colorimetric and Fluorometric Detection and Removal of Hg 2+ and its Application as Agarose Fi
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ORIGINAL ARTICLE
A New Molecular Probe for Colorimetric and Fluorometric Detection and Removal of Hg2+ and its Application as Agarose Film-Based Sensor for On-Site Monitoring Shreya Bhatt 1,2 & Gaurav Vyas 1,2 & Parimal Paul 1,2 Received: 29 July 2020 / Accepted: 15 September 2020 # Springer Science+Business Media, LLC, part of Springer Nature 2020
Abstract A new molecule incorporating two units of 7-nitro-benzoxadiazole (NBD), bridged by m-xylylenediamine, was synthesized and characterized on the basis of analytical and spectroscopic techniques. The metal ion sensing property of this molecule was studied spectroscopically with a large number of metal ions. This study revealed that it can perform as a dual-channel probe for colorimetric as well as fluorometric detection of Hg2+. In presence of Hg2+, a substantial change in UV-Vis spectrum with the appearance of a new band at 545 nm and a distinct colour change from yellow to red was observed. In the fluorescence spectrum, the intensity of the emission band was substantially quenched only upon addition of Hg2+. No significant interference from any other metal ion used in this study was noted, the limit of detection (LOD) for Hg2+ was found to be 60 and 10 nM for colorimetric and fluorometric detection method, respectively. This new chemosensor was used for removal of Hg2+ from aqueous solution with 92% efficiency. For on-site monitoring and field application, this molecule was immobilized into the agarose based hydrogel film, which was used successfully for detection of Hg2+ in water. The study on reversible behaviour of this chemosensor revealed that it can be recycled in solution as well as in solid phase by treatment with Na2S. Keywords NBD-based sensor . Detection and removal of Hg2 + . Fluorometry . Colorimetry . Agarose film . On-site monitoring
Introduction The rapid growth in industrialization has led to a significant increase in heavy metal contamination resulting in a severe threat to human health and environment. Among the heavy metal ions, mercury is one of the most toxic metal ion in all of its oxidation states [1–4]. Contamination of mercury in the environment is mainly because of various human activities like burning of coal, use of mercury in the industrial products such as cosmetics, batteries, paints etc. and improper disposal Electronic supplementary material The online version of this article (https://doi.org/10.1007/s10895-020-02625-9) contains supplementary material, which is available to authorized users. * Parimal Paul [email protected] 1
Analytical and Environmental Science Division & Centralized Instrument Facility, CSIR-Central Salt and Marine Chemicals Research Institute, G. B. Marg, Bhavnagar 364002, India
2
Academy of Scientific and Innovative Research (AcSIR), Ghaziabad 201002, India
of these products in the environment [5–9]. When mercury is exposed to the human body, it readily gets absorbed by the tissues and even at very low concentration can severely damage the central nervous system, immune system and can cause deleterio
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