Issue 1, 2024

Stimuli-directed selective detection of Cu2+ and Cr2O72− ions using a pH-responsive chitosan-poly(aminoamide) fluorescent microgel in aqueous media

Abstract

In this work, the preparation of a pH-responsive fluorescent microgel, (NANO-PAMAM-CHT), is presented for the selective detection of Cu2+ and Cr2O72− ions. The NANO-PAMAM-CHT (nanosized polyaminoamide-chitosan microgel) is synthesized via aza-Michael addition reactions in a controlled and stepwise manner in water, using easily affordable starting materials like 1,4-diaminobutane, N,N′-methylene-bis-acrylamide, NIPAM and chitosan. NANO-PAMAM-CHT shows pH-responsive fluorescent properties, whereas the fluorescence intensity shows a pH-responsive change. Due to the selective fluorescence quenching, the microgel can detect both Cu2+ ions and Cr2O72− ions selectively at ambient pH in aqueous medium. Moreover, it can selectively differentiate between Cu2+ ion and Cr2O72− ions at pH ∼3 in water. The limits of detection for Cu2+ ions and Cr2O72− ions are reported as 16.9 μM and 2.62 μM, respectively (lower than the minimum allowed level in drinking water) at pH ∼7. Mechanistic study further reveals the dynamic quenching phenomenon in the presence of Cu2+ ions and static quenching in the presence of Cr2O72− ions.

Graphical abstract: Stimuli-directed selective detection of Cu2+ and Cr2O72− ions using a pH-responsive chitosan-poly(aminoamide) fluorescent microgel in aqueous media

Supplementary files

Article information

Article type
Paper
Submitted
03 okt 2023
Accepted
11 noy 2023
First published
13 noy 2023

Soft Matter, 2024,20, 79-88

Stimuli-directed selective detection of Cu2+ and Cr2O72− ions using a pH-responsive chitosan-poly(aminoamide) fluorescent microgel in aqueous media

S. Ghosh, J. D. Katiyar and S. Chattopadhyay, Soft Matter, 2024, 20, 79 DOI: 10.1039/D3SM01319G

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