磁性天然复合 FeO-壳聚糖@膨润土去除酸性矿山排水中的重金属。
Magnetic natural composite FeO-chitosan@bentonite for removal of heavy metals from acid mine drainage.
机构信息
College of Mining Technology, Taiyuan University of Technology, Taiyuan 030024, Shanxi, PR China.
College of Mining Technology, Taiyuan University of Technology, Taiyuan 030024, Shanxi, PR China.
出版信息
J Colloid Interface Sci. 2019 Mar 7;538:132-141. doi: 10.1016/j.jcis.2018.11.087. Epub 2018 Nov 23.
Magnetic FeO-chitosan@bentonite (FeO-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 FeO-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. FeO-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, FeO-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 FeO-CS@BT was an effective and economical adsorbent for the treatment of AMD.
采用天然材料合成了磁性 FeO-壳聚糖@膨润土（FeO-CS@BT）复合材料，并将其用于修复酸性矿山排水（AMD）以去除重金属。研究发现，该复合材料具有良好的磁性、高稳定性和在去除合成水溶液中 Cr(VI)方面的优异性能。热力学参数表明，Cr(VI)在 FeO-CS@BT 上的吸附是一个放热和自发的过程。吸附动力学很好地符合拟二级模型，吸附等温线符合朗缪尔模型，在 25°C 时最大吸附容量为 62.1 mg/g。溶液 pH 是吸附的关键因素，最佳 pH 值为 2.0。FeO-CS@BT 可以通过外加磁场轻松回收，经过五次连续的吸附-解吸过程后，吸附容量仅降低了 3%。此外，FeO-CS@BT 被发现是一种去除实际 AMD 中含 Cd、Cr、Cu、Fe、Zn、Ni 和 Pb 的优良吸附剂，表明 FeO-CS@BT 是一种有效且经济的 AMD 处理吸附剂。
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