NGHIÊN CỨU CHẾ TẠO VẬT LIỆU HẤP PHỤ TỪ BÃ MÍA TỔ HỢP VỚI NANO TỪ MgFe2O4 ĐỂ LOẠI BỎ PHỐT PHÁT TRONG NƯỚC THẢI

This study investigates the synthesis of a composite material combining biochar derived from sugarcane bagasse with MgFe₂O₄ magnetic nanoparticles as an adsorbent, aiming to optimize adsorption conditions for treating phosphate pollution in wastewater. The sol-gel method was employed to produce MgFe₂O₄ nanoparticles, followed by the integration with biochar using an ultrasonic device. The effects of calcination temperature and the biochar-to-nanoparticle ratio were examined. The resulting materials, both before and after adsorption, were characterized using SEM and EDS-mapping techniques. Results revealed that the MgFe₂O₄ modified biochar (MgFe₂O₄@BC) exhibited superior performance compared to pristine biochar (BC). The study evaluated factors influencing the adsorption efficiency and capacity for PO₄³⁻, including the MgFe₂O₄@BC ratio, solution pH, adsorbent dosage, initial PO₄³⁻ concentration, and contact time. Findings indicate that optimal performance was achieved at a 5% (w/w) MgFe₂O₄@BC modification ratio, alongside optimized pH, adsorbent dosage, initial PO₄³⁻ concentration, and contact time.