五月婷网站,av先锋丝袜天堂,看全色黄大色大片免费久久怂,中国人免费观看的视频在线,亚洲国产日本,毛片96视频免费观看

　　作者：Byeong-Heon Jeonga, Eric M.V. Hoeka, Yushan Yanb, Arun Subramanib, Xiaofei Huanga, Gil Hurwitza, Asim K. Ghosha, Anna Jawora

　　（aCivil & Environmental Engineering Department and Water Technology Research Center, University of California, Los Angeles, CA 90095, USA

　　bChemical and Environmental Engineering Department, University of California, Riverside, CA 92521, USA）

　　摘要：Here, we report on a new concept for formation of mixed matrix reverse osmosis membranes by interfacial polymerization of nanocomposite thin films in situ on porous polysulfone supports. Nanocomposite films created for this study comprise NaA zeolite nanoparticles dispersed within 50–200 nm thick polyamide films. Hand-cast pure polyamide membranes exhibit surface morphologies characteristic of commercial polyamide RO membranes, whereas nanocomposite membranes have measurably smoother and more hydrophilic, negatively charged surfaces. At the highest nanoparticle loadings tested, hand-cast nanocomposite film morphology is visibly different and pure water permeability is nearly double that of hand-cast polyamide membranes with equivalent solute rejections. Comparison of membranes formed using pore-filled and pore-opened zeolites suggest nanoparticle pores play an active role in water permeation and solute rejection. The best performing nanocomposite membranes exhibit permeability and rejection characteristics comparable to commercial RO membranes. As a concept, thin film nanocomposite membrane technology may offer new degrees of freedom in tailoring RO membrane separation performance and material properties.

　　關(guān)鍵詞：Reverse osmosis; Interfacial polymerization; Zeolite; Polyamide; Mixed matrix; Nanocomposite