Green synthesis of carbon dots derived from biomass of Polyalthia bullata root extract as colorimetric sensor for selective detection of Fe3+ ions
In this study, carbon dots (CDs) were successfully synthesized using a one-step hydrothermal approach at 200 ◦C for 15 h using a biomass from the root extract of Polyalthia bullata as a carbon source. The synthesis process did not involve any chemical reagents or surface passivation. The calculated...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English English |
| Published: |
Elsevier B.V.
2025
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| Subjects: | |
| Online Access: | http://umpir.ump.edu.my/id/eprint/43586/ http://umpir.ump.edu.my/id/eprint/43586/1/Green%20synthesis%20of%20carbon%20dots%20derived%20from%20biomass%20of%20Polyalthia%20bullata%20root%20extract.pdf http://umpir.ump.edu.my/id/eprint/43586/7/Green%20synthesis%20of%20carbon%20dots%20derived%20from%20biomass%20of%20Polyalthia%20bullata%20root%20extract.pdf |
| Summary: | In this study, carbon dots (CDs) were successfully synthesized using a one-step hydrothermal approach at 200 ◦C for 15 h using a biomass from the root extract of Polyalthia bullata as a carbon source. The synthesis process did not involve any chemical reagents or surface passivation. The calculated quantum yield (QY) of the prepared CDs in comparison with a quinine sulfate was 7.55 %. Transmission electron microscopy (TEM) revealed that the CDs possessed a spherical shape and narrow size distribution with an average size of ~3.34 ± 0.76 nm. The hy drodynamic diameter was 39.55 nm using the DLS technique with a PDI value of 0.206. UV–Vis absorption spectrum revealed two absorption peaks at 252 nm and 324 nm which attributed to π − π* transition of C=C bonds and n − π* transition of C=O bonds in CDs, respectively. The CDs exhibited remarkable fluorescence (FL) with excitation and emission wavelengths of 380 nm and 470 nm, respectively. The CDs showed excitationdependent FL emission spectra upon excitation wavelengths from 300 to 500 nm with a blue shift. The average FL lifetime of the CDs was 5.634 ns. Fourier transform infrared spectroscopy (FTIR) and X-ray photo electron spectroscopy (XPS) identified numerous functional groups on the surface of CDs, such as carbonyl, hydroxyl, and carboxyl groups. The CDs were employed as a nanoprobe for Fe3+ ions detection using a colori metric approach by measuring absorbance at 200–700 nm. The sensitivity of the synthesized CDs towards Fe3+ ions was examined at concentrations from 2.5 to 200 µM. Within the Fe3+ concentration range of 0–57 µM, an excellent linear relationship with coefficient of determination (R2) of 0.9926 was observed, yielding a limit of detection of 0.186 µM. The detection method demonstrated satisfactory recovery rates when tested on real water samples such as lake, farm, and tap water. |
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