报告主题：High flux carbon membranes for water desalination
报告人 : Professor Zhiping Lai (Advanced Membranes and Porous Materials Center, Chemical Engineering, Division of Physical Science and Engineering, King Abdullah University of Science and Technology)
时间 ：2018年8月2日（星期四）上午10: 30
Polymer membranes have reached their limit in water flux in water desalination. Carbon nanotubes and aquaporin are the only known novel materials that hold great potentials to overcome this limit, but require innovative ideas to fabricate them in membranes. We developed a nanoporous carbon composite membranes, comprising a layer of porous carbon fiber structures grown on a porous ceramic substrate, that exhibited 100% salt rejection with 3 to 20 times higher freshwater flux in three membrane-based desalination processes compared to existing polymeric membranes. Thermal accounting experiments found the carbon composite membrane to save over 80% of latent heat consumption. Theoretical calculations combined with molecular dynamics simulations revealed the unique microscopic process in the membrane. When the salt solution is stopped at the openings to the nanoscale porous channels and forms a meniscus, the vapor can fast transport across the narrow gap to condense on the permeate side, driven by the chemical potential gradient and aided by the unique smoothness of the carbon surface. The high thermal conductivity of the carbon composite membrane insures that most of the latent heat is recovered.
Dr. Zhiping Lai is current a SABIC Chair associate professor of Chemical and Biological Engineering in the division of Physical Science and Engineering of King Abdullah University of Science and Technology (KAUST). He is a member of the KAUST Advanced Membranes and Porous Materials Center.
Education and work experience:
2013 – Present Associate Professor, KAUST
2009 – 2013 Assistant Professor, KAUST
2005 – 2009 Assistant Professor, Chemical and Biomolecular Engineering, Nanyang Technological University, Singapore
2003 – 2005 Research Associate, Chemical Engineering and Materials Science, University of Minnesota Twin Cities, USA
1998 – 2003 Ph.D., Chemical Engineering, University of Massachusetts Amherst, USA
1995 – 1998 M.S., Chemical Engineering, Tsinghua University, Beijing, China
1990 – 1995 B.E., Chemical Engineering, Tsinghua University, Beijing, China
Dr. Lai’s research mainly focuses on development of high-performance inorganic membranes out of ordered porous materials such as zeolites, mesoporous silica, metal organic frameworks etc., and their applications in gas separations, seawater desalination, hydrocarbon isomer separations, waste-water treatments, recovery of industrial organic solvents, membrane reactors and chemical sensors.