| Development of a Novel BN-Coated Sand as a Retrofittable Granular Adsorbent for Fixed-Bed Filtration Systems |
| کد مقاله : 1159-IWWA |
| نویسندگان |
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فاطمه سرطاوی *1، محمدعلی بقاءپور2، حسن هاشمی2، فاطمه فرجادیان3 1Student Research Committee, Shiraz University of Medical Sciences, Shiraz, Iran 2Department of Environmental Health Engineering, Shiraz University of Medical Sciences, Shiraz, Iran Research Center for Health Sciences, Institute of Health, Shiraz University of Medical Sciences, Shiraz, Iran 3Pharmaceutical Sciences Research Center, Shiraz University of Medical Sciences, Shiraz, Iran |
| چکیده مقاله |
| Pharmaceutical residues such as citalopram and fluoxetine are emerging contaminants that can persist through conventional water treatment. This study developed boron nitride (BN1)-coated sand as a stable, reusable granular adsorbent for continuous fixed-bed filtration. BN nanoparticles were successfully immobilized on quartz sand, increasing the specific surface area by 17.3% (from 1.23 to 1.44 m²/g) while preserving the pore structure. Batch experiments optimized by the Box–Behnken design identified pH, contact time, adsorbent dose, temperature, concentration, and particle size as key factors. Under optimal conditions (pH 4–5, 90 min, 2 g/L, 20 °C), removal efficiencies reached 92.4% for citalopram and 90.7% for fluoxetine. Adsorption followed pseudo-second-order kinetics (R² > 0.97), while equilibrium data fitted the modified Redlich–Peterson model. In fixed-bed columns, breakthrough occurred after approximately 30–35 min, with up to 80% greater AUC than raw sand. Importantly, no BN leaching was detected during 120 min of operation. Overall, BN-coated sand demonstrates strong potential as an effective, stable, and scalable medium for pharmaceutical removal in continuous water treatment. |
| کلیدواژه ها |
| Boron nitride, Fixed-bed adsorption, Citalopram, Fluoxetine, Granular adsorbent |
| وضعیت: پذیرفته شده برای ارائه شفاهی |
