Detisch Michael J, John Balk Thomas, Bezold Mariah, Bhattacharyya Dibakar
Department of Chemical & Materials Engineering, University of Kentucky, Lexington, Kentucky 40506, USA.
J Mater Res. 2020 Oct;35(19):2629-2642. doi: 10.1557/jmr.2020.176. Epub 2020 Oct 1.
Metallic thin-film composite membranes are produced by sputtering metal films onto commercial polymer membranes. The separations capability of the membrane substrate is enhanced with the addition of a 10 nm Ta film. The addition of a tantalum layer decreases the molecular weight cutoff of the membrane from 70 kDa dextran (19 nm) to below 5 kDa (6 nm). Water flux drops from 168 LMH/bar (LMH: liters/meters/hour) (polymer support) to 8.8 LMH/bar (Ta composite). A nanoporous layer is also added to the surface through Mg/Pd film deposition and dealloying. The resulting nanoporous Pd is a promising catalyst with a ligament size of 4.1 ± 0.9 nm. The composite membrane's ability to treat water contaminated with chlorinated organic compounds (COCs) is determined. When pressurized with hydrogen gas, the nanoporous Pd composite removes over 70% of PCB-1, a model COC, with one pass. These nanostructured films can be incorporated onto membrane supports enabling diverse reactions and separations.
金属薄膜复合膜是通过将金属膜溅射在商用聚合物膜上制备而成的。通过添加10纳米的钽膜，膜基材的分离能力得到增强。钽层的添加使膜的截留分子量从70 kDa葡聚糖（19纳米）降至5 kDa以下（6纳米）。水通量从168 LMH/巴（LMH：升/米/小时）（聚合物支撑体）降至8.8 LMH/巴（钽复合材料）。还通过镁/钯膜沉积和脱合金化在表面添加了纳米多孔层。所得的纳米多孔钯是一种有前景的催化剂，其韧带尺寸为4.1±0.9纳米。测定了复合膜处理受氯代有机化合物（COCs）污染的水的能力。当用氢气加压时，纳米多孔钯复合材料一次通过就能去除超过70%的多氯联苯-1（一种典型的COC）。这些纳米结构薄膜可结合到膜支撑体上，实现多种反应和分离。
