Physics Centre of Minho and Porto Universities (CF-UM-UP), University of Minho, 4710-057, Braga, Portugal; LaPMET - Laboratory of Physics for Materials and Emergent Technologies, University of Minho, 4710-057, Braga, Portugal; Centre of Molecular and Environmental Biology, University of Minho, 4710-057, Braga, Portugal.
Physics Centre of Minho and Porto Universities (CF-UM-UP), University of Minho, 4710-057, Braga, Portugal; LaPMET - Laboratory of Physics for Materials and Emergent Technologies, University of Minho, 4710-057, Braga, Portugal; Centre/Department of Chemistry, University of Minho, 4710-057, Braga, Portugal.
Chemosphere. 2022 Nov;307(Pt 2):135922. doi: 10.1016/j.chemosphere.2022.135922. Epub 2022 Aug 5.
Natural or industrial hexavalent chromium water pollution continues to be a worldwide unresolved threat. Today, there is intense research on new active and cost-effective sorbents for Cr(VI), but most still exhibit a critical limitation: their powdered nature makes their recovery from water cost and energy consuming. In this work, Al(OH), MIL-88-B(Fe), and UiO-66-NH Cr(VI) sorbents were immobilized into a poly (vinylidene fluoride-co-hexafluoropropylene) (PVDF-HFP) polymeric substrate to develop an easily reactivable and reusable water filtering technology. The immobilization of the sorbents into the PVDF-HFP porous matrix modified the macro and meso-porous structure of the polymeric matrix, tuning in parallel its wettability. Although a partial blocking of the Cr(VI) adsorptive capacity was observed for of Al(OH) and MIL-88-B(Fe) when immobilized into composite membranes, PVDF-HFP/UiO-66-NH filter (i) exceeded the full capacity of the non-immobilized sorbent to trap Cr(VI), (ii) could be reactivated and reusable, and (iii) it was fully functional when applied in real water effluents.
自然或工业六价铬水污染仍是一个全球性的未解决的威胁。如今，人们正在激烈研究新型高效且经济的六价铬吸附剂，但大多数仍存在一个关键的局限性：它们的粉末性质使得从水中回收它们既耗费成本又耗费能源。在这项工作中，Al(OH)、MIL-88-B(Fe) 和 UiO-66-NH 被固定在聚偏二氟乙烯-共六氟丙烯（PVDF-HFP）聚合物基质中，以开发一种易于再活化和可重复使用的水过滤技术。将吸附剂固定到 PVDF-HFP 多孔基质中，会改变聚合物基质的宏观和介观多孔结构，并同时调整其润湿性。尽管当 Al(OH)和 MIL-88-B(Fe)被固定到复合膜中时，其对六价铬的吸附容量会有部分受阻，但 PVDF-HFP/UiO-66-NH 过滤器 (i) 超过了非固定吸附剂捕获六价铬的全部容量，(ii) 可被再活化和重复使用，以及 (iii) 在实际废水处理中仍保持功能完整。
