The separation of oil-in-water emulsions containing surfactants has been a challenge in the field of water purification. The main reason limiting the use of membrane separation technology for emulsions is the reduction in flux due to membrane fouling. Introducing photo-Fenton self-cleaning reaction into membrane filtration to reduce the adverse effects of membrane fouling represents a promising direction in membrane fields. In this study, a two-step immersion method was used to prepare tannic acid (TA)-Fe(III) as a composite coating on a pristine polyvinylidene fluoride (PVDF) membrane, and then HPO₄^2- was added to the coating, which greatly improved the hydrophilicity and compactness of the coating. The resulting membrane had separation fluxes of more than 1500 L m^-2 h⁻¹ for various oil-in-water emulsions at a transmembrane pressure of 0.1 bar, and the carbon content of all filtrates was less than 50 ppm. The prepared membranes exhibit satisfactory antifouling ability. After 50 min of continuous high-efficiency separation, the membrane undergoes a photo-Fenton reaction under ultraviolet light to restore the original wettability and flux. After 5 self-cleaning cycles, it can still recover to 96.96% of the original flux. The high permeation and excellent self-cleaning property of the PVDF/TA-Fe(III)-HPO₄ membrane manifest its attractive potential application in water purification.

含有表面活性剂的水包油乳液的分离一直是水净化领域的挑战。限制将膜分离技术用于乳剂的主要原因是由于膜结垢而导致的通量降低。将光芬顿自清洁反应引入膜过滤以减少膜污染的不利影响代表了膜领域的一个有希望的方向。在这项研究中，采用两步浸没法在原始聚偏二氟乙烯（PVDF）膜上制备单宁酸（TA）-Fe（III）作为复合涂层，然后将HPO ₄ ^2-添加到涂层中，大大改善了涂层的亲水性和致密性。所得膜的分离通量大于1500 L m ^-2 h对于跨膜压力为0.1 bar的各种水包油乳液，^-1，并且所有滤液的碳含量均小于50 ppm。制备的膜表现出令人满意的防污能力。连续高效分离50分钟后，该膜在紫外线下发生光芬顿反应，以恢复原始的润湿性和通量。经过5个自清洁循环后，它仍然可以恢复到原始焊剂的96.96％。PVDF / TA-Fe（III）-HPO ₄膜的高渗透性和出色的自洁性能证明了其在水净化中的诱人潜力。