School of Architecture and Materials, Chongqing College of Electronic Engineering, Chongqing, 401331, China.
College of Geography and Environmental Sciences, Zhejiang Normal University, Jinhua, 321004, China.
J Environ Manage. 2024 Feb;351:119922. doi: 10.1016/j.jenvman.2023.119922. Epub 2023 Dec 26.
Layered double hydroxides (LDHs) have gained significant recognition for their facile synthesis and super-hydrophilic two-dimensional (2D) structure to fabricate antifouling membranes for oily wastewater separation. However, conventional PVDF membranes, due to their hydrophobic nature and inert matrix, often exhibit insufficient permeance and compatibility. In this study, a novel NiFe-LDH@MnO/PVDF membrane was synthesized using ultrasonic, redox, and microwave-hydrothermal processes. This innovative approach cultivated grass-like NiFe-LDH@MnO nanoparticles within an inert PVDF matrix, promoting the growth of highly hydrophilic composites. The presence of NiFe-LDH@MnO resulted in pronounced enhancements in surface morphology, interfacial wettability, and oil rejection for the fabricated membrane. The optimal NiFe-LDH@MnO/PVDF-2 membrane exhibited an extremely high pure water flux (1364 L m•h), and increased oil rejection (from 81.2% to 93.5%) without sacrificing water permeation compared to the original PVDF membrane. Additionally, the NiFe-LDH@MnO/PVDF membrane demonstrated remarkable antifouling properties, evident by an exceptional fouling resistance ratio of 96.8% following slight water rinsing. Mechanistic insights into the enhanced antifouling performance were elucidated through a comparative "semi-immersion" investigation. The facile synthesis method, coupled with the improved membrane performance, highlights the potential application prospects of this hybrid membrane in emulsified oily wastewater treatment and environmental remediation.
层状双氢氧化物(LDHs)因其易于合成和超亲水二维(2D)结构而在制备用于含油废水分离的防污膜方面受到了广泛关注。然而,由于其疏水性和惰性基质,传统的聚偏氟乙烯(PVDF)膜通常表现出不足的渗透性和兼容性。在本研究中,使用超声、氧化还原和微波水热过程合成了一种新型的 NiFe-LDH@MnO/PVDF 膜。这种创新方法在惰性 PVDF 基质中培育了草状的 NiFe-LDH@MnO 纳米粒子,促进了高亲水性复合材料的生长。NiFe-LDH@MnO 的存在显著改善了所制备膜的表面形态、界面润湿性和拒油性能。最佳的 NiFe-LDH@MnO/PVDF-2 膜表现出极高的纯水通量(1364 L m·h),并且与原始的 PVDF 膜相比,油截留率(从 81.2%增加到 93.5%)而不牺牲水渗透。此外,NiFe-LDH@MnO/PVDF 膜表现出出色的抗污染性能,在轻微水冲洗后,其抗污染阻力比达到了 96.8%。通过比较“半浸入”研究阐明了增强抗污染性能的机制见解。这种简便的合成方法结合改进的膜性能,突出了这种杂化膜在乳化含油废水处理和环境修复方面的潜在应用前景。