REMEDIATION OF LEAD AND ARSENIC IONS FROM WASTEWATER USING MAGNETIC ADSORBENTS | ||||
| Egyptian Journal of Chemistry | ||||
| Articles in Press, Accepted Manuscript, Available Online from 24 August 2025 | ||||
| Document Type: Original Article | ||||
| DOI: 10.21608/ejchem.2025.398796.11977 | ||||
 View on SCiNiTO | ||||
| Authors | ||||
Hoyeda E. Ibrahim 1; Zeinab M Anwar1; Alaa Eldin Y. Ismael1; Mahmoud O Abd El-Magied  2
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| 1Chemistry Department, Faculty of Science, Suez Canal University, Ismailia 41522, Egypt | ||||
| 2Nuclear Materials Authority, P.O. Box 530, El Maadi, Cairo, Egypt | ||||
| Abstract | ||||
| This study investigates the remediation of lead and arsenic pollution from wastewater using synthesized and characterized magnetic adsorbents. Magnetite (Fe-Mag), magnetic chitosan (Chito-Fe-Mag), and magnetic magnesium ferrite (Mg-Fer) were synthesized and characterized in the remediation of lead and arsenic ions from water. The remediation of lead ions was optimum at pH 6, at which the Mg-Fer, Fe-Mag, and Chito-Fe-Mag surfaces attract Pb ions via electrostatic and coordination interactions. Conversely, arsenic adsorption was maximized at pH 2.5, where positively charged adsorbent surfaces interacted with arsenic anionic species. The removal efficiencies of both metal ions increased with longer contact time and higher initial concentrations. Maximum lead adsorption capacities were achieved after 90 minutes for Mg-Fer and Fe-Mag and 120 minutes for Chito-Fe-Mag, with corresponding capacities of 109.41, 93.87, and 132.45 mg/g. On the other hand, maximum arsenic adsorption capacities were attained after 120 minutes for all three adsorbents, reaching 26.96, 29.78, and 39.84 mg/g for Mg-Fer, Fe-Mag, and Chito-Fe-Mag, respectively. The initial concentration of lead and arsenic ions may affect the remediation capacity due to its effects on mass transfer resistance and the availability of both free active sites and metal ion ratios. Langmuir, Dubinin-Radushkevich, and pseudo-second-order models show an acceptable fit with experimental data. According to the Langmuir model, the maximum adsorption capacities of Mg-Fer, Fe-Mag, and Chito-Fe-Mag were 129.87, 114.94, and 136.99 mg/g for lead and 34.60, 38.76, and 46.08 mg/g for arsenic, respectively. The mean free energy (E) values suggest that the adsorption processes are primarily physical in nature. The higher adsorption efficiencies achieved (up to 78.3 for As and up to 98.1 for Pb) suggest the potential of these Mg-Fer, Fe-Mag, and Chito-Fe-Mag for wastewater treatment applications. | ||||
| Keywords | ||||
| Magnetic adsorbents; Magnetite nanoparticles; Chitosan; Magnesium ferrite; Lead; Arsenic; Remediation | ||||
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