College of Materials and Chemistry, China Jiliang University, Hangzhou, Zhejiang, 310018, PR China.
College of Materials and Chemistry, China Jiliang University, Hangzhou, Zhejiang, 310018, PR China; State Key Laboratory of Molecular Reaction Dynamics, Dalian Institute of Chemical Physics, Chinese Academy of Science, Dalian, 116023, Liaoning, China.
Water Res. 2023 Sep 1;243:120333. doi: 10.1016/j.watres.2023.120333. Epub 2023 Jul 10.
Oily sewage has made serious impact on environment and people's life, and its treatment has become a global problem to be urgently solved. Oil-water separation has been considered to be an effective method to treat oily sewage at present. In this work, an underwater super-oleophobic/super-hydrophilic membrane with oil-water separation and self-cleaning properties was fabricated by electrochemical oxidation of sodium lignosulfonate doped polypyrrole. The membrane showed super-hydrophilicity for water-removal in air and super-hydrophilicity for oil-removal underwater in both oxidation and reduction states. The oil-water separation efficiency of the membranes for different organics exceeded 98.44%, no matter in oxidation or reduction state. Moreover, the membrane still exhibited excellent performance in terms of the oil-water separation efficiency and flux after 70 cycles, which were greater than 97.18% and 70.14 L·m·h, respectively. Simultaneously, through exploration of the mechanism, it was found that the larger anion kept intact in the membrane during the redox process, which made the stability of composition and performance. Thus, the membrane with advantageous properties, including underwater super-oleophobic/super-hydrophilicity, high oil-water separation efficiency, high circulating rate and stability, has significant potential in separation and collection of oily sewage.
含油污水对环境和人们的生活造成了严重影响，其处理已成为亟待解决的全球性问题。油水分离被认为是目前处理含油污水的有效方法。本工作通过电化学氧化磺化木质素掺杂聚吡咯制备了水下超疏油/超亲水膜，具有油水分离和自清洁性能。膜在氧化和还原状态下均表现出超亲水性（空气中脱除水分）和超亲油性（水下脱除油分）。无论在氧化还是还原状态下，膜对不同有机物的油水分离效率均超过 98.44%。此外，该膜在 70 次循环后仍表现出优异的油水分离效率和通量，分别大于 97.18%和 70.14 L·m·h。同时，通过对机理的探索发现，在氧化还原过程中，较大的阴离子在膜中保持完整，这使得组成和性能稳定。因此，这种具有水下超疏油/超亲水、高油水分离效率、高循环速率和稳定性等优点的膜在含油污水的分离和收集方面具有重要的应用潜力。
