论文标题
使用基于石墨烯的膜中的氢同位素分离液体水
Hydrogen isotope separation using graphene-based membranes in liquid water
论文作者
论文摘要
使用石墨烯/Nafion复合膜过滤的气态H2/D2有效地实现了氢同位素分离。然而，杜特隆在自然界中几乎不以气态D2的形式存在。因此，这是一种将氘与水分开和富含水的更可行的方法。在此，我们已成功将单层石墨烯转移到刚性和多孔的聚合物底物PITEM（聚酰亚胺跟踪膜）中，该膜可以避免Nafion底物的肿胀问题，并保持石墨烯的完整性。同时，CVD石墨烯大面积的缺陷可以通过界面聚合成功修复，从而导致高分离因子。此外，提出了一种基于动力学同位素效应（KIE）的单层石墨烯的质子传输机理的新模型。在此模型中，石墨烯通过完全破坏O-H/O-D键在H/D分离过程中起重要作用，这可以最大程度地提高KIE，从而导致H/D分离性能提示。这项工作表明，在行业中使用单层石墨烯有前途的应用，并提出了对石墨烯中质子运输的明显理解
Hydrogen isotope separation has been effectively achieved using gaseous H2/D2 filtered through graphene/Nafion composite membranes. Nevertheless, deuteron nearly does not exist in the form of gaseous D2 in nature but in liquid water. Thus, it is a more feasible way to separate and enrich deuterium from water. Herein we have successfully transferred monolayer graphene to a rigid and porous polymer substrate PITEM (polyimide tracked film), which could avoid the swelling problem of the Nafion substrate, as well as keep the integrity of graphene. Meanwhile, defects in large area of CVD graphene could be successfully repaired by interfacial polymerization resulting in high separation factor. Moreover, a new model was proposed for the proton transport mechanism through monolayer graphene based on the kinetic isotope effect (KIE). In this model, graphene plays the significant role in the H/D separation process by completely breaking the O-H/O-D bond, which can maximize the KIE leading to prompted H/D separation performance. This work suggests a promising application of using monolayer graphene in industry and proposes a pronounced understanding of proton transport in graphene
