超滤膜负载UiO-66@Fe3O4@UiO-66强化PPCPs去除和膜污染控制

本研究通过聚偏氟乙烯（PVDF）膜内负载具有协同吸附和催化作用的金属有机骨架（MOFs），吸附去除水中药品及个人护理品（PPCPs），并且达到膜滤过程中多功能材料吸附能力再生和膜污染控制的双重目的.在膜吸附方面，共混基质膜（MMMs）内MOFs材料UiO-66@Fe₃O₄@UiO-66能够有效吸附以水杨酸（SA）和邻-苯二甲酸二甲酯（DMP）为模板化合物的两种常见PPCPs.在膜催化再生方面，UiO-66@Fe₃O₄@UiO-66中的Fe₃O₄能够催化H₂O₂生成强氧化性的羟基自由基（HO·），实现对MOFs/PVDF膜吸附能力再生和膜内污染控制的耦合.结果表明，pH=7±0.1条件下，10% MOFs/PVDF膜对0.1 mmol·L^-1 SA和DMP吸附去除率最高，它们的去除率可分别达到64.2%和46.1%.除此之外，膜内UiO-66@Fe₃O₄@UiO-66催化5 mmol·L^-1 H₂O₂，能够使膜通量和膜吸附性能恢复率分别达到91.8%和94.2%.实验设计的这种负载多功能MOFs共混基质膜的特点是它对膜吸附能力再生和膜污染控制过程的耦合.这为生化尾水深度净化过程中PPCPs去除和膜抗污染性能改善提供了新的思路.

Enhancing PPCPs Removal and Membrane Fouling Control of Ultrafiltration Membrane by UiO-66@Fe3O4@UiO-66

Pharmaceuticals and personal care products (PPCPs) adsorption and membrane fouling control were realized by a polyvinylidene fluoride (PVDF) membrane loaded with multifunctional metal-organic frameworks (MOFs) in this study. During adsorption, the multifunctional MOFs UiO-66@Fe₃O₄@UiO-66 in the mixed-matrix membrane (MMMs) could adsorb two typical PPCPs, salicylic acid (SA), and dimethyl phthalate (DMP), efficiently. In the membrane catalytic regeneration process, Fe₃O₄ in UiO-66@Fe₃O₄@UiO-66 could catalyze H₂O₂ to generate hydroxyl radicals (HO·), coupling MOFs/PVDF adsorption capacity regeneration and membrane cleaning. The results show that 10%MOFs/PVDF exhibits the highest adsorption efficiency for 0.1 mmol·L^-1 SA and DMP under neutral conditions, and the removal rate reached 64.2% and 46.1%, respectively. Additionally, the pure water flux and membrane adsorption capacity of 10%MOFs/PVDF were able to recover about 91.8% and 94.2%, respectively, using 5 mmol·L^-1 H₂O₂. In this research, the main characteristic of MOFs/PVDF is coupling of the membrane adsorption capacity regeneration and membrane fouling control process. This provides new ideas for the removal of PPCPs and the improvement of membrane anti-fouling performance during the deep purification of secondary effluent.