Effect of various aqueous extracting agents on fluorescence properties of waste tea residue derived carbon dots (WTR‐CDs): Comparative spectroscopic analysis. (25th January 2022)

• Record Type: Journal Article
• Authors: Mote, Umesh S.; Gore, Anil H.; Panja, Sumit Kumar; Kolekar, Govind B.
• Is Part Of: Luminescence. Volume 37:Number 3(2022)
• Page Start: 440
• Page End: 447
• Publication Date: 2022-01-25
• Subjects: aqueous extracting agents -- carbon dots -- fluorescence -- spectroscopic analysis -- waste tea residue; Luminescence -- Periodicals; Bioluminescence -- Periodicals; Chemiluminescence -- Periodicals; Luminescence -- Periodicals; 535.35
• DOI: 10.1002/bio.4190
• Languages: English
• ISSNs: 1522-7235

Abstract

Abstract: Fluorescent carbon dots (CDs) are one of the important carbonaceous nanomaterials in the area of nanoscience and nanotechnology because of their interesting physical as well as chemical properties. Herein we studied the effect of various aqueous extracting agents on fluorescence properties of waste tea residue‐based carbon dots (WTR‐CDs). WTR‐CDs are firstly synthesized by utilizing kitchen waste‐based carbonaceous biomass. To check the role of various aqueous media during the course of WTR‐CDs synthesis from carbonized carbon powder, extraction of WTR‐CDs was carried out in various kinds of aqueous media viz., only aqueous (100% water, WT), aqueous‐alcoholic (10% ethanol, ET), aqueous‐acidic (10% acetic acid, AA), and aqueous‐basic (10% ammonia, AM). The consequences of extracting agents on the photophysical properties of final WTR‐CDs‐WT, WTR‐CDs‐ET, WTR‐CDs‐AA and WTR‐CDs‐AM were also discussed in detail. We have observed interesting blue shift fluorescence spectra in acidic medium for WTR‐CDs‐AA and polar protic solvents compared to polar aprotic medium. The solvatochromic behaviour of WTR‐CDs‐WT in model polar and non‐polar solvent was also studied. The effect of cationic, anionic and non‐anionic surfactants on the fluorescence of WTR‐CDs‐WT was also evaluated. The proposed findings may help researchers in the near future to obtain fast, easy and direct synthesize CDs from a variety of biomass‐based precursors under different aqueous conditions. Abstract : The effect of different aqueous extracting agents on as synthesized WTR‐CDs was studied, and interesting properties were found such as strong excitation‐dependent emission and a blue shift in fluorescence spectra in the acidic medium. The fluorescence spectra of WTR‐CDs‐WT in cationic, anionic, and non‐ionic surfactants were compared, and it was found that WTR‐CDs‐WT is stable in these media.