| Title | Turning Agroforestry Waste into Value-Added Fluorescent Carbon Quantum Dots for Effective Detection of Fe3+ in an Aqueous Environment |
|---|---|
| ID_Doc | 13234 |
| Authors | Ren, HT; Qi, F; Labidi, A; Allam, AA; Ajarem, JS; Bahnemann, DW; Wang, CY |
| Title | Turning Agroforestry Waste into Value-Added Fluorescent Carbon Quantum Dots for Effective Detection of Fe3+ in an Aqueous Environment |
| Year | 2023 |
| Published | Acs Es&T Engineering, 3, 2 |
| Abstract | In the context of the circular economy, the high quantity of agroforestry waste should be transformed into sustainable and high-value materials to abate pollution, CO2 emissions, and expensive waste disposal. Herein, the agroforestry waste of apple leaves was initially used as a precursor to extract the value-added nanomaterial carbon quantum dots (CQDs) by way of an easy hydrothermal strategy without complicated purification processes, as extracted CQDs doped with N and P possess a typical graphite-like structure, a fine particle size of 2.0 nm, and excitation-dependent photoluminescence (PL) behavior. The doping of N and P endows CQDs with a much higher quantum yield (18.1%), good water solubility, high fluorescence stability, and specific recognition ability for the detection of Fe3+. The fluorescence of CQDs could be quickly quenched by Fe3+ within 1 min and recovered with the addition of ascorbic acid, suggesting the recyclability of the prepared CQD-based fluorescent probe. Systematic analyses support that a synergistic mechanism of static fluorescence quenching and inner filter effect was involved in the detection of Fe3+ by CQDs, showing a linear range between 0 and 160 mu M and a limit of detection (LOD) of 4.0 mu M. Furthermore, the feasibility of detecting Fe3+ by CQDs in practice was verified by tap water/ lake water samples. The present work evinces that apple leaves are useful in producing green and low-cost CQDs as a promising fluorescent probe for sensitive, rapid, and selective detection of Fe3+ in an aqueous environment. |
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