期刊
JOURNAL OF MEMBRANE SCIENCE
卷 550, 期 -, 页码 436-447出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.memsci.2018.01.018
关键词
Ionic liquid; Membrane distillation; Fouling; XDLVO theory; Interaction energy
资金
- National Natural Science Foundations of China [21106153]
- Solar Energy Initiative of the Chinese Academy of Sciences [KGCX2-YW-380]
- National High-Tech R&D Program of China [2012AA021202, 2014AA021005]
Membrane fouling, essentially originated from the interactions between foulant and membrane surface, is a big obstacle to use membrane distillation (MD) for ionic liquid recycling from its aqueous solution. By applying the extended Derjaguin-Landau-Verwey-Overbeek (XDLVO) approach and surface element integration method, this study mainly investigated the fouling behavior of three kinds of hydrophobic membranes during the vacuum MD (VMD) separation of 1-butyl-3-methylimidazolium chloride ([Bmim] Cl) solutions. Effects of membrane surface chemical properties (e.g. elemental composition and zeta potential), membrane surface morphology (e.g. roughness), and [Bmim] Cl concentration on the interaction energy between [Bmim] Cl and membrane surface were studied. The results showed that the Lifshitz-van der Waals (LW) and electrostatic interaction (EL) components were positive (repulsion), while the acid-base (AB) interaction component was negative (attraction). Roughening membrane surface significantly decreased the interaction energy barrier, indicating a greater risk of being fouled. Even so, membrane surface chemical properties had more important impact on membrane fouling than surface morphology. Energy barrier would be also reduced when [Bmim] Cl concentration increased, signifying a severer membrane fouling potential in a concentration process. These results were expected to help to understand ILs-fouling mechanism in VMD process and guide the selection and fabrication of promising membrane for ILs recovery.
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