Synthesis of Nano-Magnetite from Industrial Mill Chips for the Application of Boron Removal: Characterization and Adsorption Efficacy

• Main Authors: Mohammed Umar Abba, Hasfalina Che Man, Raba’ah Syahidah Azis, Aida Isma Idris, Muhammad Hazwan Hamzah, Mohammed Abdulsalam
• Format: Article
• Language: English
• Published: MDPI AG 2021-02-01
• Series: International Journal of Environmental Research and Public Health
• Subjects: nano-magnetite; boron; adsorption; regeneration; isotherm; kinetics
• Online Access: https://www.mdpi.com/1660-4601/18/4/1400
• ISSN: 1661-7827; 1660-4601

The present study synthesized nano-magnetite (Fe₃O₄) from milled steel chips using the high energy ball milling (HEBM) method, characterized it, and then utilized it as a sorbent to remediate boron concentration at various pH (4–9), dosages (0.1–0.5 g), contact times (20–240 min), and initial concentrations (10–100 mg/L). The nano-sorbents were characterized based on SEM structure, elemental composition (EDX), surface area analysis (BET), crystallinity (XRD), and functional group analysis (FTIR). The highest adsorption capacity of 8.44 mg/g with removal efficiency of 84% was attained at pH 8, 0.5 g dosage, contact time of 180 min, and 50 mg/L initial concentration. The experimental data fit best with the pseudo-second-order kinetic model with R² of 0.998, while the Freundlich adsorption isotherm describes the adsorption process with an R² value of 0.9464. A regeneration efficiency of 47% was attained even after five cycles of reusability studies. This efficiency implies that the nano-magnetite has the potential for sustainable industrial application.