Mruthunjayappa Manohara Halanur, Kotrappanavar Nataraj Sanna, Mondal Dibyendu
Centre for Nano and Material Science, Jain University, Jain Global Campus, Bangalore 562112, India.
Centre for Nano and Material Science, Jain University, Jain Global Campus, Bangalore 562112, India; IMDEA Water Institute, Avenida Punto Com, 2. Parque Científico Tecnológico de la Universidad de Alcalá, Alcalá de Henares, Madrid 28805, Spain.
J Hazard Mater. 2022 Feb 15;424(Pt C):127561. doi: 10.1016/j.jhazmat.2021.127561. Epub 2021 Oct 21.
Proteinaceous materials are promising for membranes due to greater mechanical strength, in-built functionalities, amphiphilicity and high molecular loading capacity. Herein, a novel strategy of functionalization of silk nanofibrils with metal oxyhydroxide and fabrication of ultrafast permeable multi-layered and self-cleaning membrane was demonstrated. Typically, 1.9 µm thick multilayered membrane efficiently purifies macromolecules, dyes, pharmaceutical, surfactants and oil-water emulsion contaminated wastewater with rejection rate > 89% with the flux rate > 883 Lmh. Further, the potential of the multilayered membrane was tested for series of different feed concentrations of fluoride and As (V) to validate the commercial applicability of the multilayered membranes for industry wastewater. Notably, even at higher concentration of 10-30 mgL, >96% for fluoride and >87% for As (V) rejection was obtained. Furthermore, the functionalized multilayered membrane exhibited outstanding performance for fluoride removal in real water streams, where, it purifies approximately 4710 L.m in two consecutive cycles, before the quality of the effluents no longer meets WHO criteria. However, the remarkable separation efficiency principally attributed to adsorption sites on the surface of the membrane. Thus, various regeneration strategies were established based on the nature of pollutants. More importantly, photocatalytic Fenton-like reaction assisted self-cleaning property of the multilayered membrane is demonstrated for regeneration of organic fouled membrane. Overall, the present multilayered membrane exhibits superior performance in purifying organic, inorganic contaminated water and oil-water emulsion with excellent recyclability; hence, envisaged its application for Universal water purification.
蛋白质材料因其更高的机械强度、内在功能、两亲性和高分子负载能力而有望用于制造膜。在此，展示了一种用金属氢氧化物对丝纳米纤维进行功能化并制备超快渗透多层自清洁膜的新策略。通常，1.9 µm厚的多层膜能有效净化含有大分子、染料、药物、表面活性剂和油水乳液的污染废水，截留率>89%，通量率>883 Lmh。此外，测试了多层膜对一系列不同氟化物和砷（V）进料浓度的潜力，以验证多层膜在工业废水处理中的商业适用性。值得注意的是，即使在10 - 30 mg/L的较高浓度下，氟化物的截留率>96%，砷（V）的截留率>87%。此外，功能化的多层膜在实际水流中表现出出色的除氟性能，在两个连续循环中可净化约4710 L.m的水，直到出水水质不再符合世界卫生组织标准。然而，显著的分离效率主要归因于膜表面的吸附位点。因此，根据污染物的性质建立了各种再生策略。更重要的是，证明了多层膜的光催化类芬顿反应辅助自清洁性能可用于有机污染膜的再生。总体而言，目前的多层膜在净化有机、无机污染水和油水乳液方面表现出卓越性能，具有出色的可回收性；因此，设想其可用于通用水净化。
