Zhan Yingqing, Chen Ximin, Sun Ao, Jia Hongshan, Liu Yucheng, Li Lingli, Chiao Yu-Hsuan, Yang Xulin, Zhu Fei
College of Chemistry and Chemical Engineering, Southwest Petroleum University, 8 Xindu Avenue, Chengdu, Sichuan 610500, PR China; State Key Lab of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, 8 Xindu Avenue, Chengdu, Sichuan 610500, PR China; Research Institute of Industrial Hazardous Waste Disposal and Resource Utilization, Southwest Petroleum University, Chengdu, Sichuan 610500, PR China.
College of Chemistry and Chemical Engineering, Southwest Petroleum University, 8 Xindu Avenue, Chengdu, Sichuan 610500, PR China; Research Institute of Industrial Hazardous Waste Disposal and Resource Utilization, Southwest Petroleum University, Chengdu, Sichuan 610500, PR China.
J Hazard Mater. 2023 Sep 15;458:131965. doi: 10.1016/j.jhazmat.2023.131965. Epub 2023 Jun 28.
Membrane separation technology has potential for purifying emulsified oily wastewater. However, the oils, soluble organic substances, and microorganisms can cause complex membrane fouling problems, thereby reducing the separation efficiency and service life. Herein, a highly permeable and multiple-antifouling composite membrane was prepared using porous PAN fibrous mat as support backbone for the assembly of Ag-decorated BiO @ 3D MXene Schottky heterojunction and hydrophilic TA as the adhesive. The unique arrangement of 3D MXene heterojunction and hydrophilic functionalization effectively broke through the limitation of separation flux and synergistically enhanced the anti-fouling performance of membrane. Such fibrous composite membrane achieved an exceedingly high permeability (2717-3328 L·m·h) for various emulsified oils, while ensuring excellent oil/water emulsion retention rate (99.59%) and good cycle stability. Meanwhile, the composite membrane displayed favorable photocatalytic degradation performance toward degrading MeB (96.1%) and antibacterial ability. Furthermore, the MD simulation and free radical trapping experiments were carried out to unravel the molecular interactions during the separation process and the photocatalytic mechanism of composite membrane, respectively. Overall, the combination of photocatalytic self-cleaning, anti-oil adhesion, and antibacterial effect renders the membrane high permeability and multiple-antifouling performance, which provides a new strategy for dealing with complex oily wastewater in petrochemical industry.
膜分离技术在净化乳化含油废水方面具有潜力。然而，油类、可溶性有机物和微生物会导致复杂的膜污染问题，从而降低分离效率和使用寿命。在此，以多孔PAN纤维毡为支撑骨架，组装Ag修饰的BiO@3D MXene肖特基异质结，并以亲水性TA为黏合剂，制备了一种高渗透性、多重抗污染复合膜。3D MXene异质结的独特排列和亲水性功能化有效地突破了分离通量的限制，并协同增强了膜的抗污染性能。这种纤维复合膜对各种乳化油实现了极高的渗透率（2717-3328 L·m·h），同时确保了优异的油/水乳液截留率（99.59%）和良好的循环稳定性。同时，该复合膜对降解甲基橙（96.1%）表现出良好的光催化降解性能和抗菌能力。此外，分别进行了分子动力学模拟和自由基捕获实验，以揭示分离过程中的分子相互作用和复合膜的光催化机理。总体而言，光催化自清洁、抗油黏附及抗菌作用的结合赋予了该膜高渗透性和多重抗污染性能，为石化行业处理复杂含油废水提供了一种新策略。
