期刊
JOURNAL OF MEMBRANE SCIENCE
卷 511, 期 -, 页码 54-64出版社
ELSEVIER
DOI: 10.1016/j.memsci.2016.03.046
关键词
Pressure-retarded osmosis; Thin film composite; Reinforced flat-sheet membrane; Polyvinylpyrrolidone
资金
- Singapore National Research Foundation under its Environment and Water Industry Programme Office (EWI) [1102-IRIS-07-01]
- Singapore Economic Development Board (EDB)
The salinity gradient is a renewable and sustainable energy source that can be utilized by a pressure-retarded osmosis (PRO) process. Development of the PRO technology was impeded by shortage of efficient membranes until recent surge on PRO research. In this work, flat-sheet thin film composite (TFC) PRO membranes with reinforced support layer were developed. The membrane properties were optimized by blending high molecular weight polyvinylpyrrolidone (PVP) into the polysulfone (PSI) casting solution. Influences of PVP addition on the kinetic and thermodynamic properties of the casting solution, resultant membrane properties as well as PRO performance were systematically investigated. It is showed that PVP can effectively improve the membrane morphology and pore structure. By adjusting the PSf/PVP composition in the substrate recipe, the reinforced TFC membrane is able to achieve a power density of 12.9 W/m(2) at 22 bar using 1 M NaCl draw solution and pure water feed. Long-term PRO test at the peak power density and multi-pressure cycle tests were performed on the membranes. Consistent power density and low salt flux/water flux ratio were observed in the whole tests. The results demonstrated that the reinforced TFC membrane in this study had excellent mechanical strength and stability. It would be promising for future engineering application. (C) 2016 Elsevier B.V. All rights reserved.
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