Title: Hydrogen isotope separation using graphene-based membranes in liquid water Show Chinese title

Title: 基于石墨烯膜的液态水中氢同位素分离

Abstract: 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 Show Chinese abstract

Abstract: 氢同位素分离已通过气体H2/D2通过石墨烯/Nafion复合膜过滤有效实现。 然而，氘核在自然界中几乎不存在于气态D2形式，而是存在于液态水中。 因此，从水中分离和富集氘更为可行。 在此，我们成功地将单层石墨烯转移到刚性和多孔聚合物基底PITEM（聚酰亚胺轨迹薄膜）上，这可以避免Nafion基底的膨胀问题，同时保持石墨烯的完整性。 同时，通过界面聚合成功修复了大面积CVD石墨烯中的缺陷，从而实现了高分离因子。 此外，基于动力学同位素效应（KIE），提出了一种新的质子通过单层石墨烯的传输机制模型。 在这个模型中，石墨烯通过完全断裂O-H/O-D键，在H/D分离过程中起着重要作用，这可以最大化KIE，从而提高H/D分离性能。 这项工作表明了单层石墨烯在工业中具有广阔的应用前景，并提出了对石墨烯中质子传输的显著理解。