Shikha Bhogal

CuBTC@CQDs (15%) proves to be an efficient adsorbent and photocatalyst for the remediation of tetracycline.

A mesoporous silica-encapsulated wheat straw-derived carbon dots functionalized with Schiff base silane pockets (m-SiO ₂ _ws-CDs@SBs) has been developed for the detection of aspirin.

A facile “turn‐off” fluorescence sensing approach based on nitrogen and sulfur codoped carbon dots intercalated into graphitic carbon nitride (N, S‐CDs@gC ₃ N ₄ ) has been developed for the selective and sensitive detection of mercury ions (Hg ²⁺ ). The sensor offers the synergistic interaction between N, S‐CDs and gC ₃ N ₄ , where nitrogen and sulfur doping not only enhances fluorescence properties but also promotes strong Hg‐S and Hg‐N binding affinity. Upon interaction with Hg ²⁺ the fluorescence of the N, S‐CDs@gC ₃ N ₄ composite is significantly quenched via static quenching mechanism (excitation/emission at 370/425 nm). The sensor shows a linear response to Hg ²⁺ in the range of 1.0–7.2 μM ( R ² = 0.99) with a limit of detection of 0.421 μM. The method was successfully applied to detect Hg ²⁺ in spiked tap and canal water samples at concentrations of 1.01, 2.84, and 4.47 µM, yielding recoveries of 98.89%–99.21% (RSD: 0.74%–2.26%) for tap water and 96.76%–98.03% (RSD: 0.61%–1.59%) for canal water. These results demonstrate the potential of N, S‐CDs@gC ₃ N ₄ for real‐time application of Hg ²⁺ .

Chitosan-functionalized nitrogen-doped carbon dots (N-CDs@C) were synthesised as an environmentally-friendly fluorescence probe. N-CDs@C was employed as “turn-on” sensor for the detection of fluoride anion.

This research presents a sustainable and efficient method for synthesizing polydopamine imprinted magnetic carbon dots (MCDs@PI), which were synthesized from wheat straw via hydrothermal carbonization. The carbon dots were magnetically functionalized using iron salts and coated with a polydopamine layer, where dopamine acted as a functional monomer as well as a cross-linker. The sensor demonstrated high selectivity and sensitivity for mefenamic acid, achieving a limit of detection of 2.59 nM and a linear range of 13-103.6 nM (R² = 0.993). Recovery studies in spiked tap and river water samples showed excellent accuracy, with recoveries ranging from 98.72 to 100.80% and %RSDs between 1.08 and 3.79%, respectively. In pharmaceutical tablet analysis, recoveries ranged from 96.44 to 98.08% (%RSD: 3.25-4.03%). Moreover, the current approach exhibits a BAGI score of 75. These results underscore the potential of MCDs@PI as a robust, selective, and sustainable platform for trace-level detection of pharmaceutical pollutants in complex matrices.

A highly sensitive and efficient magnetic‐carbon dot molecularly imprinted polymer (M‐CD/MIP) was developed for the selective detection of diclofenac (DCF). The M‐CD/MIP probe combines the magnetic separation features of iron oxide, the fluorescent characteristics of CDs, and the molecular identification proficiency of MIPs to fulfill its design objectives. This synergistic integration imparts magnetic responsivity (19.01 emu g⁻¹), high spectrofluorometric sensitivity (LOD = 1.65 ng/mL), fast detection (6 min), and selectivity for DCF. The method effectively detected DCF in hospital and sewage water with recoveries ranging from 96% to 103.7%. The fluorescent sensing probe M‐CD/MIP developed in this study offers an effective solution for the rapid and easy detection of DCF in environmental and aquatic samples.

Polydopamine is a biomimetic macromolecule utilized as both a functional monomer and cross linker in molecular imprinting to construct a sensing material integrated with rice husk‐derived fluorescent carbon dots (MIFCDs‐PDA) for the recognition of methyl paraben (MeP). The sensing process utilizes specific cavities on the probe surface to recognize MeP selectively. This leads to fluorescence quenching via photoinduced electron transfer between MIFCDs‐PDA and MeP, enabling rapid detection within 8 min. Under optimized experimental conditions, the MIFCDs‐PDA can detect MeP up to the detection limit of 0.16 ng mL⁻¹, with excellent linearity over the 1.00–50.00 ng mL⁻¹ range. Additionally, the method can detect MeP from tap, river, and wastewater samples with recoveries of 96.90%–100.61% and good precision (relative standard deviation < 5%). This study presents a promising method for developing efficient fluorescent probes from biowaste. It showcases MIFCDs‐PDA's potential for selective MeP determination in various environmental compartments, suggesting avenues for future research and potential applications in environmental monitoring and safety.