Graphene is a well-known two-dimensional (2D) material that exhibits preeminent electrical, mechanical and thermal properties owing to its unique one-atom-thick structure. Graphene and its derivatives (e.g., graphene oxide (GO)) have become emerging nano-building blocks for separation membranes featuring distinct laminar structures and tunable physicochemical properties. Extraordinary molecular separation properties for purifying water and gases have been demonstrated by graphene-based membranes, which have attracted a huge surge of interest during the past few years. [1-2]
This presentation will give an overview of our recent progresses on GO membranes for molecule and ion transport, with a focus on our attempts on tuning the fast and selective channels within the membrane. We demonstrate a scalable fabrication of GO membranes on ceramic hollow fiber substrate  and propose a novel bio-inspired strategy is proposed to utilize the synergistic effect of a hydrophilic polymer and GO laminates to realize fast water-transport channels for constructing high-efficiency membrane for pervaporation dehydration of aqueous organic solution. For gas separation, we design a novel type of membrane with fast and selective gas-transport channels of GO laminates enabled by polymer-GO hydrogen bonding, showing excellent CO2 permeation performance. A facile methodology of external forces driven assembly is proposed to precisely manipulate the GO membranes with highly ordered 2D microstructure for precise molecular gas separation. Such well-defined nanochannels are also achieved in ultrathin MXene membrane and show a transformation from “diffusion-control” to “solution-control” after chemical tuning. For water purification, we demonstrate nanoparticles (NPs)@GO membranes with significantly expanded inter-layer channels meanwhile ordered laminar structures, exhibiting ultrahigh water permeance. By incorporating three-dimensional (3D) nanoporous NPs into GO laminates can further increase the numbers of nanofluidic channels. To further realize ion separation, we achieved facile and precise control of the interlayer spacing in GO membranes, with a precision of down to 1 Å, and corresponding ion rejection, through the addition of one kind of cation. Our very recent study on surface-charged GO membrane provides another approach to realize controllable ion transport without impeding water filtration though GO membrane.
 G. Liu, W. Jin, et al., Chem. Soc. Rev., 44 (2015) 5016-5030.
 G. Liu, W. Jin, et al., Angew. Chem. Int. Ed., 55 (2016) 13384-13397.
 K. Huang, W. Jin, et al., Angew. Chem. Int. Ed., 53 (2014) 6929-6932.
 K. Huang, W. Jin, et al., Adv. Funct. Mater., 25 (2015) 5809-5815.
 J. Shen, W. Jin, et al., Angew. Chem. Int. Ed., 54 (2015) 578-582.
 J. Shen, W. Jin, et al., ACS Nano, 10 (2016) 3398-3409.
 J. Shen, W. Jin et al., Adv. Funct. Mater., 28 (2018) 1801511.
 M. Zhang, W. Jin, et al., AIChE J., 63 (2017) 5054-5063.
 K. Guan, W. Jin, et al., J. Membr. Sci., 542 (2017) 41-45.
 L. Chen, G. Shi, J. Shen, M. Wu, W. Jin, J. Li, H. Fang, et al., Nature 550(2017) 380-383.
 M. Zhang, W. Jin, et al., Nat. Commun., 10 (2019) 1253.
Dr. Wanqin Jin is a professor of Chemical Engineering at Nanjing Tech University, Fellow of Royal Society of Chemistry, the Deputy-director of the State Key laboratory of Materials-oriented Chemical Engineering and the Chief-scientist of the National Basic Research Program of China (973 Program) and Major Program of National Natural Science Foundation of China (NSFC). He received his Ph.D. from Nanjing University of Technology in 1999. He was a research associate at Institute of Materials Research &Engineering of Singapore (2001), an Alexander von Humboldt Research Fellow (2001-2013), visiting professors at Arizona State University (2007) and Hiroshima University (2011, JSPS invitation fellowship). His currently research focuses on the development of membrane materials and processes. He has published nearly 300 peer-reviewed journal publications including Nature, Nat. Comm., Adv. Mater., Angew. Chem., J. Am. Chem. Soc., AIChE J., J. Membr. Sci., Chem. Eng. Sci. with 10000+ citations; written 2 monographs, contributed 6 book chapters and hold 40 authorized patents. He presented over 40 plenary, keynote lectures and invited speeches in international conferences, and was co-chair of the 10th International Congress on Membrane and membrane Processes (ICOM2014). He is now an editor of Journal of Membrane Science, and on the Editorial Boards of Chinese Journal of Chemical Engineering, Asia-Pacific Journal of Chemical Engineering and Inorganic Materials, and is a council member of Aseanian Membrane Society (AMS). In 2018, he received the first prize of MOE Natural Science Award (China) and the Hou Te-Pang Award for Innovation in Chemical Science and Technology. His research has been recognized by the IChemE Underwood Medal for his leading research in the area of separation in 2019.