Key Laboratory for Green Technology of Ministry of Education, School of Chemical Engineering and Technology, Tianjin University, Tianjin, 300072, China.
Collaborative Innovation Center of Chemical Science and Engineering, Tianjin, Tianjin, 300072, China.
Angew Chem Int Ed Engl. 2017 Nov 6;56(45):14246-14251. doi: 10.1002/anie.201708048. Epub 2017 Oct 4.
Achieving high membrane performance in terms of gas permeance and carbon dioxide selectivity is an important target in carbon capture. Aiming to manipulate the channel affinity towards CO to implement efficient separations, gas separation membranes containing CO -philic and non-CO -philic nanodomains in the interlayer channels of graphene oxide (GO) were formed by intercalating poly(ethylene glycol) diamines (PEGDA). PEGDA reacts with epoxy groups on the GO surface, constructing CO -philic nanodomains and rendering a high sorption capacity, whereas unreacted GO surfaces give non-CO -philic nanodomains, rendering low-friction diffusion. Owing to the orderly stacking of nanochannels through cross-linking and the heterogeneous nanodomains with moderate CO affinity, a GO-PEGDA500 membrane exhibits a high CO permeance of 175.5 GPU and a CO /CH selectivity of 69.5, which is the highest performance reported for dry-state GO-stacking membranes.
在气体渗透性和二氧化碳选择性方面实现高膜性能是碳捕集的一个重要目标。为了操纵通道对 CO 的亲和力以实现有效的分离，通过插层聚（乙二醇）二胺（PEGDA）在氧化石墨烯（GO）的层间通道中形成含有 CO 亲和性和非 CO 亲和性纳米域的气体分离膜。PEGDA 与 GO 表面上的环氧基团反应，构建 CO 亲和性纳米域并赋予高吸附能力，而未反应的 GO 表面则赋予非 CO 亲和性纳米域，赋予低摩擦扩散。由于纳米通道的交联有序堆叠和具有适度 CO 亲和力的异质纳米域，GO-PEGDA500 膜表现出 175.5 GPU 的高气 CO 渗透性和 69.5 的 CO/CH 选择性，这是报道的干燥状态 GO 堆积膜的最高性能。
