We propose a facile method for preparing polyvinylidene fluoride (PVDF) membranes with exceptional selectivity for rare earth ions and stability by UV irradiation technology using 3,3′, 4,4′-benzophenone tetracarboxylic acid (BTA) as the grafted materials. The grafting of BTA onto the membrane surface was confirmed through Fourier transform infrared spectroscopy, and X-ray photoelectron spectroscopy. The selection factors of PVDF-g-BTA membranes for Dy3+ over Na+, K+, Ca2+, and Mg2+ were 140.57, 114.16, 74.23, and 86.25, respectively. The adsorption capacity of the PVDF-g-BTA membranes remained above 80 % following five adsorption–desorption cycles, and the contact angle remained stable throughout the 30 days of immersion.

中文翻译：

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一种用于稀土回收的新型吸附膜，使用 3,3'，4,4'-二苯甲酮四羧酸 （BTA） 通过简单的紫外线接枝制备


我们提出了一种简单的方法，以 3,3′，4,4′-二苯甲酮四羧酸 （BTA） 作为接枝材料，通过紫外照射技术制备聚偏二氟乙烯 （PVDF） 膜，该方法对稀土离子具有优异的选择性和稳定性。通过傅里叶变换红外光谱和 X 射线光电子能谱证实 BTA 接枝到膜表面。PVDF-g-BTA 膜对 Dy3+ 优于 Na+、K+、Ca2+ 和 Mg2+ 的选择因子分别为 140.57、114.16、74.23 和 86.25。PVDF-g-BTA 膜的吸附容量在 5 次吸附-解吸循环后保持在 80% 以上，并且在浸泡 30 天内接触角保持稳定。