Chen Hao, Wu Haonan, Dai Yuting, Qiu Fengxian, Zhang Tao
School of Chemistry and Chemical Engineering, Jiangsu University, Zhenjiang 212013, China.
School of Chemistry and Chemical Engineering, Jiangsu University, Zhenjiang 212013, China.
J Hazard Mater. 2024 Dec 5;480:136336. doi: 10.1016/j.jhazmat.2024.136336. Epub 2024 Oct 28.
Here, a top-down strategy was presented to fabricate a heterogeneous polyurethane hybrid foam with independent oil-absorbing frameworks and uninterrupted water transport channels for continuous emulsion separation. A commercial polyurethane foam (PUF) was hydrophobically modified to develop oil-absorbing frameworks (HPUF). Superhydrophilic carbon nanotubes/cellulose nanofibers (CNTs/CNFs) aerogels were assembled in the voids of the HPUF to establish independent water transport channels, forming a heterogeneous polyurethane hybrid foam (CHPUF). This design endowed the CHPUF with a heterogeneous wetting structure formed by the hydrophobic HPUF and the hydrophilic CNTs/CNFs aerogels, which allowed it to exhibit super hydrophilicity and underwater oil-absorbing properties. The underwater oil-absorbing properties can promote the dynamic cleaning of oil contamination at the separation interface to improve the continuity of emulsion separation. Meanwhile, the heterogeneous wetting structure of the CHPUF and photothermal-induced effect of CNTs synergistically enhanced their demulsification capability. Leveraging these structural and functional attributes, the CHPUF have demonstrated exceptional potential in continuous emulsion separation, demonstrating a robust separation capacity with a single separation volume surpassing 3000 mL and remarkable recyclability, evidenced by over five stable separation cycles each maintaining the separation efficiency of 98 %. The CHPUF have exhibited promising separation suitability for multiple surfactant-stabilized oil-in-water emulsions, achieving over 800 L·m·hand 99 % of separation flux and efficiency, respectively. Consequently, the CHPUF with dynamic oil cleaning and enhanced demulsification display great potential for treating oily wastewater, while inspiring the development of novel 3D superwetting materials, propelling their application in environmental remediation.
在此，我们提出了一种自上而下的策略，用于制备具有独立吸油框架和不间断输水通道的异质聚氨酯混合泡沫，以实现连续乳液分离。对商用聚氨酯泡沫（PUF）进行疏水改性，以开发吸油框架（HPUF）。将超亲水碳纳米管/纤维素纳米纤维（CNTs/CNFs）气凝胶组装在HPUF的孔隙中，以建立独立的输水通道，从而形成异质聚氨酯混合泡沫（CHPUF）。这种设计赋予CHPUF一种由疏水的HPUF和亲水的CNTs/CNFs气凝胶形成的异质润湿结构，使其具有超亲水性和水下吸油性能。水下吸油性能可促进分离界面处油污的动态清除，以提高乳液分离的连续性。同时，CHPUF的异质润湿结构和CNTs的光热诱导效应协同增强了它们的破乳能力。利用这些结构和功能特性，CHPUF在连续乳液分离中显示出卓越的潜力，单次分离体积超过3000 mL，具有强大的分离能力和显著的可回收性，五个以上稳定分离循环的分离效率均保持在98% 以上，证明了这一点。CHPUF对多种表面活性剂稳定的水包油乳液表现出良好的分离适用性，分离通量和效率分别超过800 L·m−2·h−1和99%。因此，具有动态油污清除和增强破乳能力的CHPUF在处理含油废水方面显示出巨大潜力，同时也为新型3D超润湿材料的开发提供了灵感，推动了它们在环境修复中的应用。
