Switchable superlyophobic CoAl-layered double hydroxide (LDH)-based mesh membranes for separation of various oil/water systems and removal of soluble organic pollutants
Switchable superlyophobic CoAl-layered double hydroxide (LDH)-based mesh membranes for separation of various oil/water systems and removal of soluble organic pollutants
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DOI：
10.1016/j.seppur.2024.126500
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发表时间：
2024-01
影响因子：
8.6
通讯作者：
Pei Nian;Xiaojuan Wang;Xiaoling Zuo;Shuming Li;Siyuan Qiao;Yibin Wei
中科院分区：
文献类型：
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作者：
Pei Nian;Xiaojuan Wang;Xiaoling Zuo;Shuming Li;Siyuan Qiao;Yibin Wei
可切换表面润湿性因其潜在的应用前景而受到广泛关注，但如何构建液下双超疏水表面用于乳化油/水混合物的可逆分离和复杂含油废水的处理仍是一个棘手的问题。本工作制备了一种CoAl-LDH基膜，用于乳化油废水的可切换分离。通过水热法在不锈钢网（SSM）上生长互穿CoAl-LDH纳米片，形成微米/纳米分级结构，赋予膜液下双重超疏水性。所得到的CoAl-LDH膜表现出可切换的分离能力，油/水混合物和油/水乳液与高通量和效率（99.7%）。此外，CoAl-LDH膜不仅可以分离，而且还可以光降解含可溶性有机污染物的O/W乳状液。有趣的是，在引入ZnO纳米棒层后，LDH/ZnO膜对亚甲基蓝（MB）的去除效率（99%）和光降解效率（>99%）逐渐提高。循环和苛刻条件测试也证实了制备的膜的稳定性和耐用性。该膜优良的分离性能和光催化性能使其在实际的油水分离和含油废水处理中具有很好的应用前景。
Switchable surface wettability has attracted tremendous attention owing to its potential applications, but it is still thorny to construct under-liquid dual superlyophobic surfaces for reversible separation of emulsified oil/water mixtures and treatment of complex oily wastewater. In this work, a CoAl-LDH-based mesh membrane was prepared for switchable separation of emulsified oily wastewater. The interpenetrating CoAl-LDH nanosheets were grown on the stainless steel mesh (SSM) forming a micro-/nano hierarchical structure via a hydrothermal method, which endows the membrane with under-liquid dual superlyophobicity. The obtained CoAl-LDH membrane exhibited switchable separation capability for both oil/water mixtures and oil/water emulsions with high fluxes and efficiencies (99.7%). In addition, the CoAl-LDH membrane could not only separate but also photodegrade the oil-in-water (O/W) emulsions containing soluble organic pollutants. Interestingly, after introducing a ZnO nanorod layer, the LDH/ZnO membrane exhibited progressive removal efficiency (99%) and photodegradation efficiency (>99%) for methylene blue (MB). The cycled and harsh condition tests also confirmed the stability and robustness of the prepared membranes. The excellent separation performance and photocatalytic property endow the membranes appealing to practical oil/water separation and oily wastewater treatment.