Journal
SEPARATION AND PURIFICATION TECHNOLOGY
Volume 122, Issue -, Pages 32-40Publisher
ELSEVIER
DOI: 10.1016/j.seppur.2013.10.032
Keywords
In situ ultraviolet-light-induced TiO2 nanohybrid membrane; Superhydrophilic; Pervaporation dehydration
Categories
Funding
- Program for New Century Excellent Talents in University, Ministry of Education, China [NCET-12-0604]
- Specialized Research Fund for the Doctoral Program of Higher Education [20121103110010]
- Fok Ying Tung Education Foundation [131068]
- National High Technology Research and Development Program of China [2012AA03A607]
- Program for Innovative Research Team in Beijing Academy of Science and Technology [IG201204C1]
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The membrane surface property is one of the most important factors that influence the solution diffusion-controlled pervaporation process. In the present study, a superhydrophilic nanohybrid membrane was successfully prepared by in situ ultraviolet irradiation of titanium dioxide (TiO2) nanoparticles imbedded in polyelectrolyte complexes. The TiO2 precursor solution was dynamically filtered through a layer-by-layer-assembled poly(ethyleneimine)/poly(acrylic acid) multilayer under a specific pressure. Subsequently, ultraviolet radiation was used to improve the hydrophilicity of the nanohybrid membranes via photoinduction of the superhydrophilic property of the TiO2 nanoparticles. When the membranes were irradiated, the surface contact angle decreased from 62 degrees to 3 degrees, which is characteristic of a superhydrophilic membrane surface. The pervaporation performance of the membrane for separating alcohol/water mixtures was investigated. The water content could be enriched from 5 wt% (in the feed) to 99.89 wt% (in the permeate) and the permeate flux was 865 g/(m(2) h) in the pervaporation of the ethanol/water mixture. These results indicated that the superhydrophilic surface was beneficial for improving the pervaporation dehydration performance. (C) 2013 Elsevier B.V. All rights reserved.
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