State Key Laboratory of Applied Organic Chemistry, Lanzhou University, Lanzhou, Gansu 730000, P. R. China.
State Key Laboratory of Nickel and Cobalt Resources Comprehensive Utilization, Jinchang, Gansu 737100, PR China.
ACS Appl Mater Interfaces. 2020 Apr 1;12(13):15002-15011. doi: 10.1021/acsami.9b19734. Epub 2020 Mar 17.
Heavy metal pollution is a severe problem worldwide. Great efforts have been devoted in developing effective and eco-friendly ways to remove heavy metal ions from contaminated water. However, challenges remain in terms of the high cost, the complex preparation processes required, low efficiency, and difficulties in scaling-up. Here, we report a sulfhydryl-functionalized wood (SH-wood) membrane featuring three-dimensional mesoporous and low-tortuosity lumens, which serve as multisite metal traps to achieve highly efficient heavy metal ion removal from wastewater. Benefiting from the unique microstructure of wood, the resulting membrane exhibits a high saturation uptake capacity of 169.5, 384.1, 593.9, and 710.0 mg·g for Cu, Pb, Cd, and Hg ions, respectively. Meanwhile, the SH-wood membrane can be easily regenerated at least eight times without apparent performance loss. Furthermore, stacking multilayers of the SH-wood filter is designed. Because of its high yet universal heavy metal ion absorbance capability, the multilayer SH-wood filter can effectively remove diverse heavy metal ions from real contaminated water, meeting the WHO standards while also displaying a high flux rate of 1.3 × 10 L·m·h. Our work presents a promising strategy for the scalable and highly efficient removal of heavy metal ions from sewage for environmental remediation.
重金属污染是一个全球性的严重问题。人们致力于开发有效且环保的方法，以去除受污染水中的重金属离子。然而，在成本高、所需制备工艺复杂、效率低以及难以规模化等方面仍存在挑战。在这里，我们报告了一种巯基功能化木材（SH-wood）膜，其具有三维介孔和低曲折度的孔道，作为多位点金属陷阱，可实现从废水中高效去除重金属离子。得益于木材的独特微观结构，所得到的膜对 Cu、Pb、Cd 和 Hg 离子的饱和吸附容量分别高达 169.5、384.1、593.9 和 710.0 mg·g。同时，SH-wood 膜可以至少再生 8 次而没有明显的性能损失。此外，还设计了堆叠多层 SH-wood 过滤器。由于其高且通用的重金属离子吸附能力，多层 SH-wood 过滤器可以有效地从实际受污染的水中去除多种重金属离子，达到世界卫生组织的标准，同时还显示出 1.3×10 L·m·h 的高通量。我们的工作为从污水中进行规模化和高效去除重金属离子以进行环境修复提供了一种有前景的策略。
