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Thin-film composite forward osmosis membrane prepared from polyvinyl chloride/cellulose carbamate substrate and its potential application in brackish water desalination |
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| Authors: | Ke Zheng Shaoqi Zhou Zuqin Cheng Guoru Huang |
| Affiliation: | 1. School of Civil Engineering and Transportation, South China University of Technology, Guangzhou, Guangdong, China
School of Environment and Energy, South China University of Technology, Guangzhou, Guangdong, China;2. School of Civil Engineering and Transportation, South China University of Technology, Guangzhou, Guangdong, China;3. School of Environment and Energy, South China University of Technology, Guangzhou, Guangdong, China;4. School of Civil Engineering and Transportation, South China University of Technology, Guangzhou, Guangdong, China State Key Laboratory of Subtropical Building Science, South China University of Technology, Guangzhou, Guangdong, China |
| Abstract: | Synthesized by the reaction between α-cellulose and m-tolyl isocyanate (MTI), cellulose carbamate (CC) was blended with polyvinyl chloride (PVC) to fabricate substrates for thin-film composite (TFC) forward osmosis (FO) membranes. The introduction of CC into substrates improved both membrane structure and performance. The substrates exhibited higher porosity and hydrophilicity, and better connective pore structure; while rejection layer exhibited better morphology but limited cross-linked degree decrease after the introduction of CC. According to the results, the CC blend ratio of 10% was the optimal ratio. With this blend ratio, the TFC-10 membrane presented favorable water permeability (1.86 LMH/bar) and structure parameter (337 μm), which resulted in excellent FO performance (water flux with a value of 40.40 LMH and specific salt flux with a value of 0.099 g/L under rejection layer faces draw solution DS] mode when 1 M NaCl and deionized water were utilized as DS and feed solution). In addition, the TFC-10 membrane showed good water flux and low-sulfate ion leakage in the potential application of brackish water desalination. |
| Keywords: | membranes separation techniques |