Puji, S.; Guo, J.; Zhang, Y.; Song, K.; Wu, F.; Li, J. Iron-Loaded Carbonized Spent Bleaching Earth (Fe-SBE/C) Composite Used for Arsenic Removal from Water. Preprints2024, 2024020685. https://doi.org/10.20944/preprints202402.0685.v1
APA Style
Puji, S., Guo, J., Zhang, Y., Song, K., Wu, F., & Li, J. (2024). Iron-Loaded Carbonized Spent Bleaching Earth (Fe-SBE/C) Composite Used for Arsenic Removal from Water. Preprints. https://doi.org/10.20944/preprints202402.0685.v1
Chicago/Turabian Style
Puji, S., Feng Wu and Jing Li. 2024 "Iron-Loaded Carbonized Spent Bleaching Earth (Fe-SBE/C) Composite Used for Arsenic Removal from Water" Preprints. https://doi.org/10.20944/preprints202402.0685.v1
Abstract
For the last two decades, an increasing demand for low-cost adsorbents for drinking water treatment has been challenged in the rural areas of developing countries that have problems with arsenic (As) contamination. In this work, spent bleaching earth (SBE), a residual material that is formed during the process of refining vegetable oil, has been utilized to prepare the new magnetic adsorbent Fe-SBE/C by modifying its surface area through calcination and co-precipitation with iron. The experimental results demonstrate that Fe-SBE/C exhibits a substantial adsorption capacity towards both arsenite (As(III)) and arsenate (As(V)). Optimal pH conditions were found to be pH 10 for As(III) and pH 3 for As(V), resulting in adsorption percentages of 76.7% and 94.1%, respectively. Other experimental parameters such as calcination conditions, adsorbent dosage, iron-loading ratio, and the presence of co-existing ions were thoroughly investigated. The kinetic study revealed that the adsorption processes follow the Elovich and intraparticle diffusion models, suggesting a combined adsorption mechanism of boundary layer control and chemisorption. Furthermore, the isotherm followed the Langmuir model with a maximum adsorption capacity of 202.61 μg g-1 for As(III) and 187.61 μg g-1 for As(V). Through thermodynamic analysis and reinforcement by activation energy data, this research validates that the observed adsorption process is indicative through chemisorption. The regeneration study revealed the potential for multiple cycles of arsenic removal, highlighting the practical applicability of Fe-SBE/C in environmental contexts. In conclusion, the findings of this study underscore the efficacy of Fe-SBE/C in arsenic removal and present it as a promising and environmentally friendly solution for mitigating arsenic pollution.
Environmental and Earth Sciences, Water Science and Technology
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