Beijing Key Laboratory of Materials Utilization of Nonmetallic Minerals and Solid Wastes, National Laboratory of Mineral Materials, School of Materials Science and Technology, China University of Geosciences, Beijing 100083, China; Department of Ecosystem Science and Management, Materials Research Institute, Materials Research Laboratory, the Pennsylvania State University, University Park, PA 16802, United States.
Beijing Key Laboratory of Materials Utilization of Nonmetallic Minerals and Solid Wastes, National Laboratory of Mineral Materials, School of Materials Science and Technology, China University of Geosciences, Beijing 100083, China.
J Hazard Mater. 2016 Nov 15;318:54-60. doi: 10.1016/j.jhazmat.2016.06.044. Epub 2016 Jun 22.
A one-pot method to remove two organic dye contaminants and alkali simultaneously from alkaline wastewater was developed by forming Zn-Al layered double hydroxide (ZnAl-LDH). Using this process, not only alkali but also methyl orange (MO), an anionic contaminant was totally removed from wastewater. In addition, cationic contaminant, methylene blue (MB) was also removed effectively while maintaining the high removal efficiency of MO. The removal efficiency of MO was almost 100% and the pH of the treated wastewater decreased from 12 to 7.38. The charge-limited removal process, molecular arrangement of the contaminants in LDHs, and the anomalous removal mechanism were analyzed experimentally and through simulation. After MO accumulated in the interlayers of LDH by electrostatic interaction, MB entered and trapped by hydrophobic interaction.
开发了一种通过形成 Zn-Al 层状双氢氧化物（ZnAl-LDH）来同时去除碱性废水中两种有机染料污染物和碱的一锅法。通过该工艺，不仅可以从废水中完全去除碱，还可以去除阴离子污染物甲基橙（MO）。此外，阳离子污染物亚甲蓝（MB）也被有效去除，同时保持 MO 的高去除效率。MO 的去除效率几乎达到 100%，处理后的废水的 pH 值从 12 降低到 7.38。通过实验和模拟分析了限制电荷的去除过程、污染物在 LDHs 中的分子排列以及异常的去除机制。在 MO 通过静电相互作用积累在 LDH 的层间后，MB 进入并通过疏水相互作用被捕获。
