Chromium (VI) detection by microbial carbon dots: Microwave synthesis and mechanistic study

Anil, AG and Ramachandran, S and Kumar, V and Subramanian, S and Ramamurthy, PC (2022) Chromium (VI) detection by microbial carbon dots: Microwave synthesis and mechanistic study. In: Journal of Basic Microbiology, 62 (3-4). pp. 455-464.

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Abstract

Functionalized carbon dots (CDs) derived from Citrobacter freundii bacterial cells were used for selective detection of Cr(VI). A microwave-heating-based green synthesis approach is adopted to produce functionalized CDs from C. freundii bacterial cells (CF-CDs). The reaction was carried out in a 500 W microwave digester at 200°C for 20 min. The supernatant was filtered with a 0.2 µm filter and highly monodisperse CDs were obtained. Inherent functionalization of CF-CDs with nitrogen and oxygen-containing functional groups made them extremely selective toward Cr(VI) with a lower limit of detection of ~1.7 ppm. More importantly, CF-CDs could distinguish between Cr(VI) and Cr(III), which is highly desirable for practical applications. The fabricated sensor had a dual linear response range between 0 and 50 µM and 50–250 µM. The synthesized CDs were inherently functionalized which made them highly selective for Cr(VI) detection. CF-CDs also possess high stability over long storage period. This study reports the facile synthesis and characterization of a highly selective sensor for Cr(VI). As opposed to similar CDs sensors reported for Cr(VI), based on inner-filter effect, CF-CDs exhibit a strong, specific interaction toward Cr(VI), indicated by the large binding constant.

Item Type:	Journal Article
Publication:	Journal of Basic Microbiology
Publisher:	John Wiley and Sons Inc
Additional Information:	The copyright for this article belongs to the John Wiley and Sons Inc.
Keywords:	bacteria-derived carbon dots; Cr(VI) detection; fluorescence quenching; functionalized carbon dots; microwave synthesis
Department/Centre:	Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy)
Date Deposited:	17 Nov 2021 10:45
Last Modified:	30 Jun 2022 05:16
URI:	https://eprints.iisc.ac.in/id/eprint/70509

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