Porous block polymer composite membranes for uranium uptake
Porous block polymer composite membranes for uranium uptake
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DOI：
10.1016/j.apsusc.2023.158650
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发表时间：
2023-10
影响因子：
6.7
通讯作者：
Xinping He;Michael P. Dugas;John N. Hodul;B. Boudouris;W. Phillip
中科院分区：
文献类型：
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作者：
Xinping He;Michael P. Dugas;John N. Hodul;B. Boudouris;W. Phillip
吸附膜是从海水和污染水源中捕获铀的有效解决方案。目前的基于纤维膜的吸附剂遭受在固液界面处的低密度结合配体和宽的孔径分布。这些问题导致诸如低结合容量和在流通吸附期间的逐渐穿透曲线的问题。我们试图通过开发高渗透性（即，<$3.5 × 104 L m− 2 h −1bar−1）酰胺肟官能化聚砜（Psf）/聚苯乙烯-b-聚（丙烯酸）（PS-PAA）复合膜。一个表面偏析和气相诱导相分离（SVIPS）的方法被用来制造膜，具有互连的孔结构与PAA内衬孔壁。PAA刷提供高密度的反应性羧基位点，使表面化学能够用腈基改性，然后转化为偕胺肟（AO）配体，用于高容量的铀吸附。功能化的Psf/PS-PAO膜从稀溶液中去除铀的能力为150 mg g−1。流通实验证明了膜的快速传质，在0.1和1.0 mg L−1的进料浓度下，膜从流动溶液中吸附超过90%的铀酰离子。批量吸附-解吸实验也表明膜在几个循环中的可重复使用性。因此，这种基于膜的吸附剂为痕量浓度下的高效铀捕获提供了化学定制的平台。
Adsorptive membranes are an effective solution to capture uranium from seawater and contaminated water supplies. Current fibrous membrane-based sorbents suffer from a low density of binding ligands at the solid–liquid interface and broad pore size distributions. These issues lead to problems such as low binding capacity and gradual breakthrough curves during flow-through adsorption. We sought to address these challenges by developing highly permeable (i.e., ∼3.5×104L m−2h−1bar−1) amidoxime-functionalized polysulfone(Psf)/polystyrene-b-poly(acrylic acid) (PS-PAA) composite membranes. A surface-segregation and vapor-induced phase separation (SVIPS) method was used to fabricate membranes that have an interconnected pore structure with PAA-lined pore walls. The PAA brushes offer a high density of reactive carboxyl sites that enable the surface chemistry to be modified with nitrile groups and then converted to amidoxime (AO) ligands for high-capacity uranium adsorption. The functionalized Psf/PS-PAO membrane removes uranium from dilute solution with a capacity of 150 mg g−1. Flow-through experiments demonstrate rapid mass transfer of the membranes, which adsorb over 90% of the uranyl ions from flowing solutions at feed concentrations of 0.1 and 1.0 mg L−1. Batch sorption–desorption experiments also indicate reusability of membranes over several cycles. Therefore, this membrane-based sorbents offers a chemically tailored platform for high-efficient uranium capture under trace concentrations.