Detisch Michael J, Balk T John, Bhattacharyya Dibakar
Department of Chemical and Materials Engineering, University of Kentucky, Lexington, KY 40506, USA.
Ind Eng Chem Res. 2018 Mar 28;57(12):4420-4429. doi: 10.1021/acs.iecr.8b00053. Epub 2018 Mar 5.
Composite membranes were produced with a metallic thin film forming the upper layer of the composite on a porous polymer support. Commercially available membranes were used as supports with both micron and nanometer scale pores. Alloy films of ~110 nm thickness were deposited via magnetron sputtering to produce the top layer of the composite. Dealloying the film with sulfuric acid allowed the creation of a nanoporous film structure with a ligament size of 7.7 ± 2.5 nm. Resulting composite membranes were permeable to water at all stages of production, and a UF PSf membrane with 90 nm of nanoporous Fe/Pd on top showed a flux of 183 LHM/bar. The films were evaluated for dechlorination of toxic polychlorinated biphenyls from water. At a loading of 6.6 mg/L of Pd attached to 13.2 cm support in a 2.5 ppm PCB-1 solution with 1.5 ppm dissolved H, over 90% of PCB-1 was removed from solution in 30 minutes, which produced the expected product biphenyl from the dechlorination reaction.
复合膜是在多孔聚合物载体上制备的，其中金属薄膜形成复合膜的上层。使用具有微米和纳米级孔隙的市售膜作为载体。通过磁控溅射沉积厚度约为110 nm的合金膜，以制备复合膜的顶层。用硫酸对该膜进行脱合金处理，可以形成韧带尺寸为7.7±2.5 nm的纳米多孔膜结构。所得复合膜在生产的各个阶段都能透水，顶部具有90 nm纳米多孔Fe/Pd的超滤聚砜膜通量为183 LHM/bar。对这些膜进行了从水中脱除有毒多氯联苯的评估。在含有1.5 ppm溶解氢的2.5 ppm PCB-1溶液中，在附着于13.2 cm载体上的6.6 mg/L Pd负载量下，30分钟内超过90%的PCB-1从溶液中被去除，脱氯反应生成了预期产物联苯。
