Raypah, Muna E. and Mohd Faizal, Jamlos and Giwa, Shehu Hadiza and Hajar Fauzan, Ahmad and Hazrulrizawati, Abd Hamid (2025) Green synthesis of carbon dots derived from biomass of Polyalthia bullata root extract as colorimetric sensor for selective detection of Fe3+ ions. Inorganic Chemistry Communications, 174 (Part 1). pp. 1-14. ISSN 1387-7003. (In Press / Online First) (In Press / Online First)
![[img]](http://umpir.ump.edu.my/style/images/fileicons/other.png) |
Pdf
Green synthesis of carbon dots derived from biomass of Polyalthia bullata root extract.pdf - Accepted Version Restricted to Repository staff only Download (2MB) | Request a copy |
|
Pdf
Green synthesis of carbon dots derived from biomass of Polyalthia bullata root extract.pdf Restricted to Repository staff only Download (4MB) | Request a copy |
Abstract
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.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | Carbon dots; Polyalthia bullata; Biomass; Fe3+ ions; Colorimetric sensor |
| Subjects: | Q Science > QD Chemistry T Technology > TP Chemical technology |
| Faculty/Division: | Faculty of Industrial Sciences And Technology Institute of Postgraduate Studies Centre of Excellence for Artificial Intelligence & Data Science Faculty of Electrical and Electronic Engineering Technology |
| Depositing User: | Mrs Norsaini Abdul Samat |
| Date Deposited: | 17 Jan 2025 03:35 |
| Last Modified: | 17 Jan 2025 03:35 |
| URI: | http://umpir.ump.edu.my/id/eprint/43586 |
| Download Statistic: | View Download Statistics |
Actions (login required)
 |
View Item |