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https://hdl.handle.net/2440/123245
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Type: | Journal article |
Title: | Magnetic natural composite Fe₃O₄-chitosan@bentonite for removal of heavy metals from acid mine drainage |
Other Titles: | Magnetic natural composite Fe(3)O(4)-chitosan@bentonite for removal of heavy metals from acid mine drainage |
Author: | Feng, G. Ma, J. Zhang, X. Zhang, Q. Xiao, Y. Ma, Q. Wang, S. |
Citation: | Journal of Colloid and Interface Science, 2019; 538:132-141 |
Publisher: | Elsevier |
Issue Date: | 2019 |
ISSN: | 0021-9797 1095-7103 |
Statement of Responsibility: | Guorui Feng, Jianchao Ma, Xiaopeng Zhang, Qingfang Zhang, Yuqiang Xiao, Qingliang Ma, Shaobin Wang |
Abstract: | Magnetic Fe₃O₄-chitosan@bentonite (Fe₃O₄-CS@BT) composites using natural materials were synthesized and used to remediate acid mine drainage (AMD) for heavy metal removal. It was found that the composites had a good magnetism, high stability and good performance in removal of Cr(VI) in the synthetic aqueous solutions. The thermodynamic parameters showed that Cr(VI) adsorption onto Fe₃O₄-CS@BT was an exothermic and spontaneous process. The adsorption kinetics was well described by a pseudo-second-order model, and the adsorption isotherms fit the Langmuir model with a maximum adsorption capacity of 62.1 mg/g at 25 °C. Solution pH was a key factor for adsorption and the optimized pH was 2.0. Fe₃O₄-CS@BT could be easily recycled through an external magnetic field and the adsorption capacity reduced by only 3% after five consecutive adsorption-desorption processes. In addition, Fe₃O₄-CS@BT was found to be an excellent adsorbent for actual AMD remediation containing Cd, Cr, Cu, Fe Zn, Ni and Pb, suggesting that the Fe₃O₄-CS@BT was an effective and economical adsorbent for the treatment of AMD. |
Keywords: | Fe₃O₄-chitosan@bentonite; acid mine drainage; Cr(VI) adsorption; heavy metals |
Rights: | © 2018 Elsevier Inc. All rights reserved. |
DOI: | 10.1016/j.jcis.2018.11.087 |
Published version: | http://dx.doi.org/10.1016/j.jcis.2018.11.087 |
Appears in Collections: | Aurora harvest 8 Chemical Engineering publications |
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