The Role of Some Agricultural Waste as Adsorbent in Removing Paracetamol from Simulated Wastewater
الشريط الجانبي للمقالة
محتوى المقالة الرئيسي
الملخص
The presence of residual pharmaceuticals in the aquatic system is a significant concern for ecological risk, requiring the advancement of sustainable remediation technology. This study investigates the adsorptive performance of local agricultural wastes—sawdust (SD) and olive stones (OS)—as ecofriendly biosorbents and substitutes for commercial activated carbon (AC) for the paracetamol (PC) removal from simulated aqueous solutions. The adsorbents were characterized using Fourier Transform Infrared Spectroscopy (FTIR) and Scanning Electron Microscopy (SEM). This revealed a highly porous morphology and various active functional groups. Batch adsorption experiments were evaluated to determine the influence of pH, adsorbent dosage, contact time, and temperature. The results demonstrated that the process of adsorption is highly pH-dependent, with maximum removal achieved at an optimal pH of 7. At equilibrium, the removal efficiencies reached up to 92.17% for SD and 89.25% for OS, compared to 94% for AC, using optimal dosages of 1.5 g, 1.25 g, and 1.25 g, respectively. Equilibrium data were well-fitting by the Langmuir model (R2 > 0.99), suggesting a monolayer adsorption mechanism with maximum capacities (qm) of 4.748, 4.531, and 5.621 mg/g for AC, SD, and OS, respectively. A kinetic study showed that the process followed a pseudo-second- order model (R2 > 0.99), indicating that chemisorption is the rate-limiting step. Thermodynamic analysis revealed positive enthalpy ΔH∘ values, confirming the endothermic nature of the process, while the spontaneity increased with temperature. Overall, this study highlights the potential of utilizing undervalued agricultural biomass as a cost-effective and efficient biosorbent for pharmaceutical wastewater treatment.
تفاصيل المقالة
القسم
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