摘要
The increase in oily wastewater exacerbates global water scarcity, triggering ecological damage and health risks. Although membrane separation technology was widely adopted in oily wastewater treatment due to its high efficiency and energy savings, membrane fouling issues lead to flux decline, increased energy consumption, and reduced membrane lifespan, thereby limiting its application. Therefore, this study proposed an advanced “water absorption-storage” strategy by in-situ growing UiO-66-NH₂ nanoparticles on attapulgite (APT) through carefully designed micro-nano-scale rough structures and chemical interactions, forming a unique biomimetic “corn-like” structure. The APT@UiO-66-NH₂/PEG composite membrane prepared in this study establishes a robust hydration barrier through synergistic interactions between its components, thereby exhibiting both outstanding anti-oil fouling capability and highly efficient, stable oil-water emulsion separation performance. Meanwhile, the in-situ growth of UiO-66-NH₂ on APT effectively resolved the issue of easy detachment between APT and UiO-66-NH₂. Moreover, the abundant hydrophilic functional groups (–OH) in polyethylene glycol (PEG) form hydrogen bonds with UiO-66-NH₂ and APT, further enhancing the structural stability. The obtained APT@UiO-66-NH₂/PEG composite membrane achieved separation efficiencies exceeding 99.8 % for various oil-in-water emulsions, with a separation flux reaching 3020 LMH/bar. After 10 separation cycles and 60 min of continuous operation, the separation performance remained essentially stable. The composite membrane demonstrated excellent chemical durability and mechanical stability in high-concentration acid, alkali, and salt solutions, as well as during bending and abrasion tests. Therefore, this study presents a simple and effective purification solution for practical oily wastewater, with the associated strategies and preparation techniques demonstrating broad application prospects.
危险品化学品经营许可证（带存储）