Zhang Ruixian, Mo Yuanbin, Gao Yanfei, Zhou Zeguang, Hou Xueyi, Ren Xiuxiu, Wang Junzhong, Chu Xiaokun, Lu Yanyue
Guangxi Key Laboratory for Polysaccharide Materials and Modification, Guangxi Higher Education Institutes Key Laboratory for New Chemical and Biological Transformation Process Technology, School of Chemistry and Chemical Engineering, Guangxi Minzu University, Nanning 530006, China.
Institute of Artificial Intelligence, Guangxi Minzu University, Nanning 530006, China.
Membranes (Basel). 2023 Feb 21;13(3):255. doi: 10.3390/membranes13030255.
Oil/water mixtures from industrial and domestic wastewater adversely affect the environment and human beings. In this context, the development of a facile and improved separation method is crucial. Herein, dopamine was used as a bioadhesive to bind tea polyphenol (TP) onto the surface of a polyvinylidene fluoride (PVDF) membrane to form the first hydrophilic polymer network. Sodium periodate (NaIO) is considered an oxidising agent for triggering self-polymerisation and can be used to introduce hydrophilic groups via surface manipulation to form the second hydrophilic network. In contrast to the individual polydopamine (PDA) and TP/NaIO composite coatings for a hydrophobic PVDF microfiltration membrane, a combination of PDA, TP, and NaIO has achieved the most facile treatment process for transforming the hydrophobic membrane into the hydrophilic state. The hierarchical superhydrophilic network structure with a simultaneous underwater superoleophobic membrane exhibited excellent performance in separating various oil-in-water emulsions, with a high water flux (1530 L.m h.bar) and improved rejection (98%). The water contact angle of the modified membrane was 0° in 1 s. Moreover, the steady polyphenol coating was applied onto the surface, which endowed the membrane with an adequate antifouling and recovery capability and a robust durability against immersion in an acid, alkali, or salt solution. This facile scale-up method depends on in situ plant-inspired chemistry and has remarkable potential for practical applications.
来自工业和生活废水的油/水混合物会对环境和人类产生不利影响。在此背景下，开发一种简便且改进的分离方法至关重要。在此，多巴胺被用作生物粘合剂，将茶多酚（TP）结合到聚偏氟乙烯（PVDF）膜表面，形成第一个亲水性聚合物网络。高碘酸钠（NaIO）被认为是引发自聚合的氧化剂，可用于通过表面处理引入亲水性基团，形成第二个亲水性网络。与用于疏水性PVDF微滤膜的单个聚多巴胺（PDA）和TP/NaIO复合涂层相比，PDA、TP和NaIO的组合实现了将疏水膜转变为亲水状态的最简便处理过程。具有同时水下超疏油性能的分级超亲水网络结构在分离各种水包油乳液方面表现出优异的性能，具有高水通量（1530 L·m⁻²·h⁻¹·bar⁻¹）和提高的截留率（98%）。改性膜的水接触角在1秒内为0°。此外，稳定的多酚涂层被应用于膜表面，这赋予了膜足够的抗污染和恢复能力以及对酸、碱或盐溶液浸泡的强大耐久性。这种简便的放大方法依赖于受植物启发的原位化学，具有显著的实际应用潜力。
