在聚偏二氟乙烯（PVDF）膜表面负载聚丙烯腈纤维（PAN-f），然后在其表面沉积聚多巴胺（PDA），制备聚偏二氟乙烯/聚丙烯腈纤维/聚多巴胺（PVDF/PAN-f/PDA）复合光热蒸发膜，并对其水蒸发性能、光热水净化能力进行研究。结果表明：聚丙烯腈（PAN）的加入提高了复合薄膜的亲水性以及提供较多的水输运通道，PVDF/PAN-f/PDA-0.4薄膜的光热蒸发性能最高，达到2.26 kg/m²，在循环10次后仍表现出优异的性能。针对不同的污染物水溶液，PVDF/PAN-f/PDA-0.4薄膜表现出优异的光热净化能力，蒸发量保持在2.0 kg/m²以上，在长时间运行后仍表现出稳定的性能。因此，PVDF/PAN-f/PDA-0.4薄膜可以有效用于光热污水净化应用。

Polyacrylonitrile fibers (PAN-f) were loaded onto the surface of polyvinylidene fluoride (PVDF) membranes, followed by the deposition of polydopamine (PDA) on the surface to fabricate PVDF/PAN-f/PDA composite photothermal evaporation membranes. The water evaporation performance and photothermal water purification capabilities of these membranes were investigated. The results indicated that the incorporation of polyacrylonitrile (PAN) enhanced the hydrophilicity of the composite film and provides more water transport channels. The PVDF/PAN-f/PDA-0.4 membrane exhibited the highest photothermal evaporation performance, reaching 2.26 kg/m², and maintained excellent performance even after 10 cycles. For different types of polluted water solutions, the PVDF/PAN-f/PDA-0.4 membrane demonstrated outstanding photothermal purification capabilities, with evaporation rates remaining above 2.0 kg/m² and stable performance over long-term operation. Therefore, the PVDF/PAN-f/PDA-0.4 membrane can be effectively used for photothermal wastewater purification applications.