Journal of Hazardous Materials ( IF 13.6 ) Pub Date : 2022-08-01 , DOI: 10.1016/j.jhazmat.2022.129708 Baian Kuang 1 , Xiangmei Xiang 1 , Pengcheng Su 1 , Wulin Yang 2 , Wanbin Li 1
Membrane separation is regarded as efficient technology to alleviate global water crisis. Two-dimensional membranes are promising for contaminant removal from wastewaters, but their uncontrollable transport pathway and instability hinder the further development. In this study, the high-performance and stable two-dimensional framework membranes are self-assembled by graphene oxide (GO) nanosheets and amino-appended metal-organic polyhedrons (MOPs) for water purification and remediation. The MOP molecular cages are uniformly intercalated between GO nanosheets and enriched at defects/edges, and can crosslink membranes, to provide in-plane selective channels, refine vertical passageways, and fix out-of-plane interlayer spaces. The prepared GO/MOP framework membranes have improved stability and nanofiltration performance under cross-flow condition, can keep performance in water after 50 h filtration, and show high rejections over 92% for Na2SO4 and 99% for antibiotic and dye contaminants with molecular weights over 280 g mol-1, and sixfold permeance as that of GO membranes. Our molecular cage-intercalated and crosslinked two-dimensional frameworks offer an alternative route to design robust membranes for efficient removal of contaminants in wastewaters.
中文翻译:
用于污染物去除的稳定和高性能分子笼交联氧化石墨烯膜的自组装
膜分离被认为是缓解全球水资源危机的有效技术。二维膜有望用于去除废水中的污染物,但其不可控的传输途径和不稳定性阻碍了进一步的发展。在这项研究中,高性能和稳定的二维框架膜由氧化石墨烯(GO)纳米片和氨基附加金属有机多面体(MOP)自组装,用于水净化和修复。MOP 分子笼均匀地插在 GO 纳米片之间并在缺陷/边缘处富集,并且可以交联膜,以提供面内选择性通道、细化垂直通道并固定面外层间空间。所制备的 GO/MOP 骨架膜在错流条件下具有改善的稳定性和纳滤性能, h 过滤,对 Na 2 SO 4和 99% 的抗生素和染料污染物(分子量超过 280 g mol -1)和 GO 膜的渗透率显示出 92% 以上的高截留率。我们的分子笼插层和交联二维框架提供了一种替代途径来设计坚固的膜,以有效去除废水中的污染物。