2014, Volume 16, Issue 7
Strategic Study of CAE >> 2014, Volume 16, Issue 7
Preparation and performance of homogeneous cellulose forward osmosis membrane
1.State Key Laboratory of Materials-Oriented Chemical Engineering，College of Biotechnology and Pharmaceutical Engineering，Nanjing Tech University，Nanjing 210009，China；
2. Engineering Research Centre of Membrane and Water Treatment Technology of MOE，Department of Chemical and Biological Engineering， Zhejiang University，Hangzhou 310027，China；
3. Institute for Logistic Science and Technology of the Second Artillery, Beijing 100011，China
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Abstract
The nonporous homogeneous cellulose membrane for forward osmosis was prepared via phase inversion method using ionic liquid 1-ethyl-3-methyl-imidazolium acetate (EMIMAc) as solvent, water as nonsolvent on a non-woven fabric substrate. The characterizations of Fourier transform infrared (FTIR) and X-ray diffraction (XRD) spectroscopies showed that no obvious change occurred in the chemical structure of cellulose after membrane formation, but the crystallinity had a certain degree of decline. The cross-section and the surface morphologies of the cellulose forward osmosis membrane were analyzed by scanning electron microscopy (SEM). The membrane performance were investigated by measuring water flux and rejection of simulated seawater. The water flux of the cellulose forward osmosis membrane, which the cellulose concentration is 8 %(wt) in casting solution, was 3.534 L/m2.h and the rejection for NaCl was more than 99 %, using 0.6 mol/L NaCl solution as the feed solution and lab-made nutrient solution as the draw solution.
Keywords
forward osmosis ; ionic liquid ; cellulose membrane ; phase inversion ; membrane preparation
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