The DOI matches its Crossref record; 61 of the 61 references it cites were found in a registry or an index.
Enhanced Cr(VI) removal from acidic solutions using biochar modified by Fe3O4@SiO2-NH2 particles
Abstract
Fe3O4@SiO2-NH2 magnetic particles with core-shell structure were attached on carboxylated biochar derived from phoenix tree leaves to synthesize a novel magnetic biochar for removing Cr(VI) ions from acidic solutions. FSEM, FTEM, XRD characterizations of the synthesized magnetic biochar revealed that the Fe3O4@SiO2-NH2 magnetic particles distributed uniformly on the surface or macrospores of carboxylated biochar by strong chemical bonding. The Cr(VI) ions adsorption capacity of magnetic biochar was 27.2mg·g-1, surpassing original carboxylated biochar (18.2mg·g-1). VSM and XPS characterizations demonstrated that the attached Fe3O4@SiO2-NH2 magnetic particles not only endowed biochar with perfect magnetic property (23emu·g-1) but also provided complexing sites for binding Cr(III) cations reduced from Cr(VI) anions. The Cr(VI) ions removal by magnetic biochar contained three steps: (1) adsorption of Cr(VI) anions by protonated functional groups; (2) reduction of Cr(VI) anions to Cr(III) cations by electron-donor groups; and (3) chelation of Cr(III) cations by amine groups. The adsorption recycling test showed that magnetic biochar kept 85% of its initial Cr(VI) adsorption capacity at the sixth cycle, and the Fe leakage under pH1.0 was smaller than 0.25mg·L-1. The results indicated that this novel magnetic biochar was applicable for the practical treatment of Cr(VI)-containing wastewater.
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Metadata
- Authors
- Shi, S., Yang, J., Liang, S., Li, M., Gan, Q., Xiao, K., & Hu, J.
- Venue
- Science of The Total Environment
- Publisher
- Elsevier BV
- Published
- 2018-07
- Volume
- 628-629
- Pages
- 499-508
- ISSN
- 0048-9697 (ISSN-L)
- OpenAlex
- W2792040583
- Cited by
- 316
- References
- 61
- FWCI
- 14.53
- Type
- journal article
- Language
- en
- Open access
- closed
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- Shi, S., Yang, J., Liang, S., Li, M., Gan, Q., Xiao, K., & Hu, J. (2018). Enhanced Cr(VI) removal from acidic solutions using biochar modified by Fe3O4@SiO2-NH2 particles. Science of The Total Environment. https://doi.org/10.1016/j.scitotenv.2018.02.091
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