State Key Lab for Modification of Chemical Fibers and Polymer Materials, College of Materials Science and Engineering, Donghua University, Shanghai 201620, PR China.
State Key Lab for Modification of Chemical Fibers and Polymer Materials, College of Materials Science and Engineering, Donghua University, Shanghai 201620, PR China.
J Hazard Mater. 2022 Feb 15;424(Pt D):127742. doi: 10.1016/j.jhazmat.2021.127742. Epub 2021 Nov 12.
Rapid and thorough removal of heavy metal ions in wastewater is critical for the urgent need of clean water. Herein, we prepared a high-performance thin film nanofibrous composite (TFNC) membrane consisting of a polyacrylonitrile (PAN)-UiO-66-(COOH) composite nanofibrous substrate (CPAN) and a calcium alginate (CaAlg) skin layer. Owing to abundant adsorption sites of UiO-66-(COOH) MOF, the optimal CPAN-2 nanofibrous substrate showed excellent adsorption capacity for lead ions. The maximum Pb adsorption capacity of CPAN-2 substrate calculated by Langmuir isotherm model was 254.5 mg/g. Meanwhile, due to the relatively loose structure of CaAlg skin layer, this TFNC membrane showed high water permeate flux about 50 L mh at 0.1 MPa, and the rejection for dyes was higher than 95%. Therefore, CaAlg/CPAN TFNC membranes were appropriate for dynamic adsorption/filtration to remove Pb. Compared with original CaAlg/PAN membrane, the optimal CaAlg/CPAN TFNC membrane showed much better ability to treat Pb(II)-containing wastewater and had good recyclability. Most importantly, the CaAlg/CPAN TFNC membrane could treat 7659 L m wastewater containing single lead ions under WHO drinking water standard, and effectively deal with more simulated lead-containing wastewater. This work could provide a substitutable solution for effective removal of heavy metal ions and other various contaminants in wastewater.
快速彻底地去除废水中的重金属离子对于清洁水的迫切需求至关重要。在此，我们制备了一种高性能的薄膜纳米纤维复合（TFNC）膜，由聚丙烯腈（PAN）-UiO-66-（COOH）复合纳米纤维基底（CPAN）和海藻酸钠（CaAlg）皮层组成。由于 UiO-66-（COOH）MOF 具有丰富的吸附位点，最佳的 CPAN-2 纳米纤维基底对铅离子表现出优异的吸附能力。通过 Langmuir 等温模型计算，CPAN-2 基底的最大 Pb 吸附容量为 254.5mg/g。同时，由于 CaAlg 皮层的结构相对较松散，这种 TFNC 膜在 0.1MPa 下表现出高水渗透通量约 50Lmh，对染料的截留率高于 95%。因此，CaAlg/CPAN TFNC 膜适合用于动态吸附/过滤去除 Pb。与原始的 CaAlg/PAN 膜相比，最佳的 CaAlg/CPAN TFNC 膜显示出更好的处理含 Pb(II)废水的能力，且具有良好的可循环性。最重要的是，CaAlg/CPAN TFNC 膜可以处理 7659Lm 含单一铅离子的废水，达到世界卫生组织（WHO）饮用水标准，并有效地处理更多模拟含铅废水。这项工作可以为有效去除废水中的重金属离子和其他各种污染物提供一种替代解决方案。
