378643 Fabrication of Gelatin/Graphene Oxide Ultrathin Hybrid Membrane Via Layer-By-Layer Self-Assembly for Pervaporation Dehydration Process

Monday, November 17, 2014: 10:35 AM
310 (Hilton Atlanta)
Jing Zhao1,2, Zhongyi Jiang1,2, Fusheng Pan1,2 and Yiwei Zhu3, (1)Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), Tianjin 300072, China, Tianjin, China, (2)Key Laboratory for Green Chemical Technology of Ministry of Education School of Chemical Engineering and Technology, Tianjin University, 300072, P. R. China, Tianjin, China, (3)QiuShi Honors College, Tianjin University, Tianjin, China

Fabricating composite membrane with ultrathin, defect-free and stable active layer is an effective method to achieve separation membrane with high permeability, selectivity and stability simultaneously. Layer-by-layer (LBL) self-assembly method provides an attractive option for the fabrication of ultrathin, defect-free membranes with tailored composition and tunable properties. Inspired by the distinctive mechanical properties of nacre from the ordered brick-and-mortar arrangement of organic and inorganic layers, ultrathin hybrid membranes were fabricated via LBL self-assembly of graphene oxide and gelatin for pervaporation dehydration process. Graphene oxide possesses amphiphilic structure with oxygenated polar groups on the basal plane and edge, and the hydrophobic sp2 hybridized carbon atoms on backbone. Gelatin is a natural protein composed of various hydrophobic and hydrophilic amino acids. The matching chemical structures of graphene oxide and gelatin endows the formation of multiple interactions between them (including electrostatic attraction, hydrogen bond, and hydrophobic interaction), which differs from the existing researches. The dense interface regions between graphene oxide and gelatin achieved efficient separation of water from ethanol solutions. Moreover, the micrometer-scale size of graphene oxide in horizontal direction favored the coverage of nanopores on substrate, which greatly reduced the required deposition cycles, and thus simplified the membrane-fabrication procedure.

Extended Abstract: File Not Uploaded
See more of this Session: Self-Assembled Soft Materials for Membrane Applications
See more of this Group/Topical: Separations Division