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A Quick Responsive Chitosan‐Oxine Based Thin Film to Recognize and Remove Zn 2+ Ions from Potable Water
Author(s) -
Kumar Mundayaliyath Mundayat Akhil,
Biju Valsala Madhavan Nair
Publication year - 2020
Publication title -
chemistryselect
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.437
H-Index - 34
ISSN - 2365-6549
DOI - 10.1002/slct.202002302
Subject(s) - chelation , fluorescence , ion , chitosan , detection limit , quinoline , chemistry , chloride , adsorption , aqueous solution , metal ions in aqueous solution , nuclear chemistry , inorganic chemistry , materials science , chromatography , organic chemistry , physics , quantum mechanics
Through the functionalization of chitosan (CS) with an oxine derivative, 8‐hydroxy‐2‐methyl‐quinoline5,7‐ sulfonyl chloride (HQSC), a thin film was prepared (CS‐HQSC). The film can recognize and adsorb Zn 2+ ions from the aqueous samples. The sensor performances were characterized by UV‐Visible and fluorescence spectroscopic analysis. The weakly fluorescent thin film becomes highly fluorescent in the presence of Zn 2+ ions. The solution‐phase study of the functionalized material shows a 30‐fold fluorescence enhancement in the presence of Zn 2+ ions. The chelation of Zn 2+ ions with CS‐HQSC could be the reason for the fluorescence enhancement. The chelation restricts the excited‐state proton transfer in the quinoline ring and facilitates chelation enhanced fluorescence. The sensor showed a linear detection of Zn 2+ ions from 0.2 to 2 ppm, with the lowest detection limit of 0.08 ppm. The practical applicability studies of the sensor prove that the sensor film is quick responsive (30 seconds) and recyclable in acid solution. Also, the functionalized material CS‐HQSC shows 96 % removal of Zn 2+ ions from the water samples.