Abstract
A chitosan Schiff base (SB@Chitosan) has been prepared by the condensation reaction of 5-bromosalicyldehyde and chitosan. The structural properties of SB@Chitosan have been investigated through FT-IR, 1H NMR, PXRD, TGA, and SEM analysis. The SB@Chitosan exhibited a fluorescence emission signal centred at 501 nm (λexc = 340 nm). However, the signal was quenched in the presence of e-waste toxins i.e. pentabrominated phenol, Fe3+, and Cu2+ ions. Therefore, SB@Chitosan was investigated as a spectrofluorimetric probe for the recognition and quantification of Fe3+, Cu2+, and pentabromophenol in organic-aqueous medium (H2O/DMSO; 30:70% v/v). The density-functional theory suggested the acid–base pair formation between azomethinic functionality and pentabromophenol which led to the quenching of fluorescent signal due to the photoinduced electron transfer mechanism. It also supported the mechanism of interaction between SB@Chitosan and heavy metals based on the HOMO–LUMO energy gap. The probe was also tested for practical applications like the analysis of water and soil samples.
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Acknowledgments
The authors are thankful to DST-FIST, and DST-SERB for providing financial support. The authors are also grateful to UGC for the award of Senior Research Fellowship and DST-INSPIRE.
Funding
Dr. Varinder Kaur thanks DST-FIST (vide no. SR/FST/college-335/2016), DST-SERB (SPG/2021/000445). Harshita Gupta thanks UGC for the award of Senior Research Fellowship {Ref. No.:38/[CSIR-UGC NET JUNE 2017]} and Kulwinder Kaur thanks DST-INSPIRE (IF180276).
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HG: Formal analysis; Data curation; investigation; methodology. KK: Formal analysis; investigation; methodology. VK: Conceptualization; funding acquisition; supervision. RS: Conceptualization; Supervision.
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Gupta, H., Kaur, K., Singh, R. et al. Chitosan Schiff base for the spectrofluorimetric analysis of E-waste toxins: Pentabromophenol, Fe3+, and Cu2+ ions. Cellulose 30, 1381–1397 (2023). https://doi.org/10.1007/s10570-022-04966-z
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DOI: https://doi.org/10.1007/s10570-022-04966-z