Engineering a covalently constructed omniphobic/slippery membrane for high-performance membrane distillation |
Authors: LI Peng,LI Meng,XUE Yuxuan,ZHANG Qingwu, CHEN Xiaoling,Zhang Xuan |
Units: 1.Nanjing water Group co. ,Ltd,Nanjing210002,china;2. key Laboratory of New Membrane Materials Ministry of Industry and Information Technology, Nanjing university of science& Technology,Nanjing210094,china |
KeyWords: membrane distillation;omniphobic/slippery;wetting;scaling;high saline wastewater |
ClassificationCode:TQ028. 8 |
year,volume(issue):pagination: 2024,44(1):27-36 |
Abstract: |
The functional loss of membranes caused by pore wetting , mineral scaling , or structural instability is a critical challenge in membrane distillation ( MD), severely impacting its long-term operational stability. In light of this,we provide a novel strategy to fabricate an omniphobic/slippery MD membrane via“covalent”grafting modification. specifically,spherical silica nanoparticles were covalently bonded to the surfaces of polyvinylidene fluoride (PVDF) membranes using polydopamine (PDA) interlayer,followed by direct surface fluorination through thiol-ene click chemistry. contact angle(CA) measurements reveal that the resulting membrane(PDA/PVDF c)exhibits an ultrahigh water contact angle(163. 5。士0. 9。)and low sliding angle(5. 6。士1. 2。). Besides,the membrane shows excellent wetting resistance toward various liquids with low surface tension surface tension liquids ,and outstanding anti- wetting properties for the short-term treatment of high-salinity brines containing surfactants. Due to its unique omniphobic/slippery characteristics ,the membrane can durably and stably handle high-salinity brines containing surfactants,delaying the formation of gypsum scale. The membrane exhibits an initial flux of approximately 23. 5L/(m2 . h) and maintains a salt rejection of up to99% during the whole operation. overall ,this study presents a novel and effective approach for fabricating high-performance membrane distillation(MD)membranes with high performance even under harsh operating conditions. |
Funds: |
中央高校基本科研业务费专项资金项目(30923010905);企业横向合作项目(南京水务集团有限公司);江苏 省自然科学基金青年项目(BK20210359);国家自然科学基金青年项目(52100046) |
AuthorIntro: |
李鹏(1990-), 男 , 内蒙古乌审旗人 , 工程师 , 研究方向:城市污水处理. |
Reference: |
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