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Thermoresponsive PL-ON/OFF behaviour of CuO/CDs nanocomposite for selective detection of Fe3+ ion and enhanced photocatalytic degradation of dye
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DOI：10.1016/j.compositesa.2026.110139.png)
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Abstract
En 中文
Bitter apple (Citrullus Colocynthis) was used for synthesis of luminescent CuO/CDs nanocomposites via pyrolysis. Synthesis of nanocomposite was confirmed by various analytical techniques like XRD, HR-TEM, SEM, FTIR, PZC, BET, and XPS. CuO/CDs has optical band gap of about 3.58 eV, which enables effective absorption of UV light. Hence, CuO/CDs was used as an efficient photocatalyst for degradation of methylene blue (MB) dye with a degradation efficiency of 92.32% in 75 min at pH 12.0. In addition, CuO/CDs nanocomposite showed outstanding performance as a photoluminescence (PL)-based sensor for Fe3+ ions with a limit of detection (LoD) of 37.65 nM and a limit of quantification (LoQ) of 125.51 nM. Furthermore, CuO/CDs’ temperature-dependent PL behaviour in presence of Fe3+ ions was examined over wide range of temperatures in order to assess its optical stability and sensing dependability under various thermal conditions. CuO/CDs nanocomposite exhibited usual thermal quenching up to 70°C but an uncommon rise in PL intensity of nanocomposite in presence of Fe3+ ions at 80°C was observed along with production of yellowish precipitate. Overall, CuO/CDs nanocomposite shows great promise for use in wastewater treatment and environmental monitoring as a sensitive photoluminescent probe for Fe3+ detection and as a sustainable photocatalyst for dye degradation.
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