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<p>In this study, a La-doped flexible hydrophobic Al<sub>2</sub>O<sub>3</sub> fiber membrane was fabricated via electrospinning technology, and the influence of La doping on the mechanical properties and surface wettability of the Al<sub>2</sub>O<sub>3</sub> fiber membrane was systematically investigated. The results showed that the La-doped modified alumina nanofiber membrane has tunable fiber diameters (180–480&#xa0;nm) and a highly interconnected porous network, which enhanced the efficiency and flux of oil–water separation. The incorporating an appropriate amount of rare earth La atoms, specifically at a La/Al atomic ratio of 0.125 (La-Al<sub>2</sub>O<sub>3</sub>-2), effectively enhanced the flexibility and tensile strength of the membrane. Concurrently, hydrophobic La<sub>2</sub>O<sub>3</sub> formed on the fiber surface, which transformed the membrane from hydrophilic to hydrophobic. As a result, the La-doped Al<sub>2</sub>O<sub>3</sub> membrane exhibited excellent anti-fouling performance, high permeation flux, and efficient oil–water separation. However, excessive La addition led to a significant decline in the flexibility and tensile strength of the Al<sub>2</sub>O<sub>3</sub> fiber membrane, whereas the hydrophobic surface was largely preserved. Among all samples, the La-Al<sub>2</sub>O<sub>3</sub>-2 fiber membrane exhibited superior flexibility and tensile strength. In oil–water separation applications, it achieved a high permeation flux of 2921&#xa0;L/(m<sup>2</sup>&#xa0;·h)&#xa0;and a separation efficiency of 98.4%; meanwhile, the good reusability was also obtained.</p> Graphical abstract <p></p>

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La-doped flexible hydrophobic Al2O3 fiber membranes: preparation, properties, and oil–water separation performance

  • 期刊论文

  • 发表日期：

    2026年2月24日

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  • Changjian Feng,
  • Hongkai Yang,
  • Lilan Huang,
  • Lin Lv,
  • Jiao Li

摘要

In this study, a La-doped flexible hydrophobic Al2O3 fiber membrane was fabricated via electrospinning technology, and the influence of La doping on the mechanical properties and surface wettability of the Al2O3 fiber membrane was systematically investigated. The results showed that the La-doped modified alumina nanofiber membrane has tunable fiber diameters (180–480 nm) and a highly interconnected porous network, which enhanced the efficiency and flux of oil–water separation. The incorporating an appropriate amount of rare earth La atoms, specifically at a La/Al atomic ratio of 0.125 (La-Al2O3-2), effectively enhanced the flexibility and tensile strength of the membrane. Concurrently, hydrophobic La2O3 formed on the fiber surface, which transformed the membrane from hydrophilic to hydrophobic. As a result, the La-doped Al2O3 membrane exhibited excellent anti-fouling performance, high permeation flux, and efficient oil–water separation. However, excessive La addition led to a significant decline in the flexibility and tensile strength of the Al2O3 fiber membrane, whereas the hydrophobic surface was largely preserved. Among all samples, the La-Al2O3-2 fiber membrane exhibited superior flexibility and tensile strength. In oil–water separation applications, it achieved a high permeation flux of 2921 L/(m2 ·h) and a separation efficiency of 98.4%; meanwhile, the good reusability was also obtained.

Graphical abstract