Colorimetric and absorbance based sensor for sulfide and bicarbonate ions by dye doped polymer composite

Akanksha Mishra; Anupam Kushwaha; Pratiksha Maurya; Roli Verma

doi:10.1016/j.saa.2023.123554

Colorimetric and absorbance based sensor for sulfide and bicarbonate ions by dye doped polymer composite

Spectrochim Acta A Mol Biomol Spectrosc. 2024 Jan 15:305:123554. doi: 10.1016/j.saa.2023.123554. Epub 2023 Oct 17.

Authors

Akanksha Mishra¹, Anupam Kushwaha¹, Pratiksha Maurya¹, Roli Verma²

Affiliations

¹ Department of Physics, University of Lucknow, Lucknow, 226007, India.
² Department of Physics, University of Lucknow, Lucknow, 226007, India. Electronic address: verma_r@lkouniv.ac.in.

PMID: 37866266
DOI: 10.1016/j.saa.2023.123554

Abstract

We have developed a simple, rapid and cost-effective Dual-channel "colorimetric and absorbance" sensor using polyvinylpyrrolidone (PVP) capped Rhodamine6g (Rh6G) dye composite. Dye-doped polymer composite probe (PVPRH) exhibit intense, narrow absorption properties and long-term stability than the bare Rh6G. The probe's colorimetric relationship with pH was demonstrated by absorption titration. The PVPRH provides a sensitive dual channel method for the determination of sulfide and bicarbonate with colorimetric response and absorption quenching. The synthesized probe, as a two-faced, exhibited remarkable colorimetric responses from orange to pale yellow in the presence of S^2- and orange to soft pink in the presence of HCO₃^- ion, which can be observed by the naked eye also. Under optimal conditions, the relative absorption intensity decreases with increasing ion concentration of sulfide and bicarbonate ions. This trend is observed within the probe solution concentration range of 5 mM to 50 mM. The Dye-doped polymer composite probe is easy, cost effective, rapid, and has real time detection capability for sulfide and bicarbonate ions. The composite probe is stable and optically modified and can be successfully used for detections of S^2- and HCO₃^- ions as strip senor.

Keywords: Absorbance; Anions; Colorimetric; PVP; PVPRH; Rh6G.