期刊
JOURNAL OF COLLOID AND INTERFACE SCIENCE
卷 538, 期 -, 页码 132-141出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcis.2018.11.087
关键词
Fe3O4-chitosan@bentonite; Acid mine drainage; Cr(VI) adsorption; Heavy metals
资金
- National Natural Science Foundation of China [51574172, 51204119, U1710258]
- Funds for Coal-Based Low-Carbon Technology of Shanxi [U1710258]
- Shanxi Science and Technology Development Plan (Social Development) [201603D321011]
- China Scholarship Council
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 degrees 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. (C) 2018 Elsevier Inc. All rights reserved.
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