Catalytic membrane with dual-layer structure for ultrafast degradation of emerging contaminants in surface water treatment.

Qieyuan Gao, Xinyao Jin, Xi Zhang, Junwei Li, Peng Liu, Peijie Li, Xinsheng Luo, Weijia Gong, Daliang Xu, Raf Dewil, Heng Liang, Bart Van der Bruggen
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Abstract

The catalytic membrane-based oxidation-filtration process integrates physical separation and chemical oxidation, offering a highly efficient water purification strategy. However, the oxidation-filtration process is limited in practical applications due to the short residence time of milliseconds within the catalytic layer and the interference of coexisting organic pollutants in real water. Herein, a dual-layer membrane containing a top selective layer and a bottom catalytic layer was fabricated using an in situ co-casting method with a double-blade knife. Experimental results demonstrated that the selective layer rejected macromolecular organic pollutants, thereby alleviating their interference with bisphenol A (BPA) degradation. Concurrently, the catalytic layer activated peracetic acid oxidant and achieved a high BPA degradation exceeding 90 % in milliseconds with reactive oxygen species (especially •OH). The finite-element analysis confirmed a high-concentration reaction field occupying the pore cavity of the catalytic layer, enhancing collision probability between reactive oxygen species and BPA, i.e., the nano-confinement effect. Additionally, the dual-layer membrane achieved a long-term stable performance for emerging contaminant degradation in surface water treatment. This work underscores a novel catalytic membrane structure design for high-performance oxidation-filtration processes and elucidates its mechanisms underlying ultrafast degradation.

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用于超快降解地表水处理中新出现污染物的双层结构催化膜。
基于催化膜的氧化-过滤过程集物理分离和化学氧化于一体,是一种高效的水净化策略。然而,由于催化层内的停留时间短至几毫秒,加上实际水中共存的有机污染物的干扰,氧化-过滤过程在实际应用中受到限制。在此,我们采用双刃刀原位共铸法制造了一种包含顶部选择层和底部催化层的双层膜。实验结果表明,选择层可阻挡大分子有机污染物,从而减轻其对双酚 A(BPA)降解的干扰。同时,催化层激活了过乙酸氧化剂,并在几毫秒内利用活性氧(尤其是-OH)实现了超过 90% 的双酚 A 降解。有限元分析证实,高浓度反应场占据了催化层的孔腔,提高了活性氧与双酚 A 之间的碰撞概率,即纳米聚集效应。此外,双层膜在地表水处理中实现了长期稳定的新污染物降解性能。这项研究强调了用于高性能氧化-过滤过程的新型催化膜结构设计,并阐明了其超快降解的机理。
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