A new NiAlFe layered double hydroxide/polydopamine/polyvinylidene fluoride (NiAlFe LDH/PDA/PVDF) membrane was fabricated by in-situ growth of LDH on the PDA modified PVDF membrane. The as-prepared membrane possesses a nano/microscale rough structural surface and displays the superior wettability of superhydrophilicity in air and underwater superoleophobicity. Combining the favourable features of superwettability and hierarchical rough structure, the NiAlFe LDH/PDA/PVDF membrane could effectively separate a series of oil-in-water emulsions with high efficiency (>99%) and high permeation flux (925–1913 L m⁻² h⁻¹ bar⁻¹). Besides, owing to the light harvest ability of NiAlFe LDH, the relevant membrane also can be applied as a photocatalysis paper for the light-driven treatment of antibiotic residue in aqueous solution. In which, NiAlFe LDH/PDA/PVDF membrane can effectively degrade typical antibiotic tetracycline within 20 min under UV light irradiation, exhibiting excellent photocatalytic activity. In addition, cyclic experiments demonstrate that NiAlFe LDH/PDA/PVDF membrane has excellent stability and reusability both in oil-in-water emulsion separation and photocatalytic reaction. In general, the findings of this research demonstrate that photo-response LDH modified membranes have potential multiple applications in wastewater treatment.

通过在PDA改性的PVDF膜上原位生长LDH，制备了一种新的NiAlFe层状双氢氧化物/聚多巴胺/聚偏二氟乙烯（NiAlFe LDH / PDA / PVDF）膜。所制备的膜具有纳米/微米级的粗糙结构表面，并且在空气中和水下超疏油性方面显示出优异的超亲水性润湿性。组合superwettability和分层粗结构的有利特征，所述NiAlFe LDH / PDA / PVDF膜能有效地以高效率（> 99％）和高渗透通量（925-1913 L M分离的一系列油包水乳液的^{- 2} 小时^-1 巴^-1）。此外，由于NiAlFe LDH的光收集能力，相关膜也可以用作光催化纸，用于光驱动处理水溶液中的抗生素残留。其中，NiAlFe LDH / PDA / PVDF膜在紫外线照射下20分钟内可有效降解典型的抗生素四环素，表现出优异的光催化活性。此外，循环实验表明，NiAlFe LDH / PDA / PVDF膜在水包油乳液分离和光催化反应方面均具有出色的稳定性和可重复使用性。通常，这项研究的结果表明，光响应LDH改性膜在废水处理中具有潜在的多种应用。