Abstract
In this study, ferric chloride and sulfuric acid were used to increase the Fe-containing minerals on the biochar surface before a pyrolysis at 600 °C. The pristine and Fe-modified biochars prepared at different concentrations of sulfuric acid (50FBC and 72FBC) were characterized and analyzed, and their capacity of As(V) adsorption under various pH and ionic strength were evaluated. The results showed that the maximum adsorption capacities of As(V) calculated by the Langmuir model for 50FBC and 72FBC are 10.33 and 15.61 mg g−1, respectively, which are enhanced by 5.0 and 7.8 times compared with the pristine biochar. The higher dosage of H2SO4 (72%) used in the modification leads to a better adsorption capacity of As, especially under neutral to alkaline conditions (7.0 < pH < 10.0). It might result from the increased amounts of Fe-containing minerals formed on the biochar surface, and the enriched functional groups such as phenolic hydroxyl and carboxyl, resulting in the resistance to alkaline conditions. Overall, the Fe-modified biochar, especially 72FBC, had good potential as an environmentally friendly adsorbent for removing As from contaminated water under a wider pH range.
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Funding
The authors appreciate the financial support by the Joint Fund of Basic and Applied Basic Research Fund of Guangdong Province, China (2019A1515110927), the National Natural Science Foundation for Young Scientists of China (42007142), and the Key Scientific and Technological Project of Foshan City (2120001008392). Wenbing Yuan acknowledges the Characteristic Innovation Research Project of University Teachers (2020XCC08) for financial support.
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**gzi Beiyuan, Fuguo Yang, Wenbing Yuan, and Hailong Wang contributed to the study conception and design. Material preparation, data collection, and analysis were performed by Man Xu, Yiyin Qin, Qiqi Huang, Hai** Li, Wusen Chen, **aoying Wang, and Shifei Wang. The first draft of the manuscript was written by Man Xu and Yiyin Qin; all authors commented on the manuscript. All authors read and approved the final manuscript.
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Xu, M., Qin, Y., Huang, Q. et al. Arsenic adsorption by different Fe-enriched biochars conditioned with sulfuric acid. Environ Sci Pollut Res 30, 16398–16407 (2023). https://doi.org/10.1007/s11356-022-23123-4
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DOI: https://doi.org/10.1007/s11356-022-23123-4