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High Resolution Image Download MS PowerPoint Slide The presence of antibiotic residues in aqueous systems, particularly doxycycline (DOX), is harmful to the environment and public health. In this study, dextran-coated calcium peroxide nanoparticles (DEX@nCPs(DEX)), Fe(II), and oxalic acid (OA) were combined to improve the heterogeneous Fenton-like degradation of DOX. X-ray photoelectron spectroscopy (XPS) demonstrated the successful synthesis of DEX@nCPs(DEX), showing the presence of Ca, O, and C functional groups associated with dextran. Using response surface methodology with a central composite design (RSM-CCD), the optimal conditions (DEX@nCPs(DEX) dosage: 2 g/L, pH: 5, contact time: 420 min) achieved 90% DOX removal, which was 20% higher than using DEX@nCPs(DEX)/Fe(II) alone. The degradation process followed first-order kinetics with a rate constant of k 1 = 0.0047 min –1 . Model validation showed high predictive accuracy ( R 2 = 0.996; adjusted R 2 = 0.987). Scavenger and photoluminescence analyses revealed hydroxyl radicals ( • OH) to be the primary reactive species, accounting for over 80% of the degradation activity. The DEX@nCPs(DEX)/Fe(II)/OA system offers a promising approach for mitigating pharmaceutical pollutants in water, contributing to more sustainable environmental management practices.
Nuar et al. (Fri,) studied this question.