Journal
BRAZILIAN JOURNAL OF CHEMICAL ENGINEERING
Volume 36, Issue 1, Pages 251-264Publisher
SPRINGER HEIDELBERG
DOI: 10.1590/0104-6632.20190361s20170486
Keywords
Thin film composite membrane; Support layer modification; PVC; Cross-linking; APTES
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Herein, the influence of pure and modified polyvinyl chloride (PVC) support layers on the performance of thin-film composite (TFC) membranes was investigated in water desalination. Accordingly, the PVC support was modified using (3-Aminopropyl) triethoxysilane (APTES) through bulk modification. The supports were synthesized at different doses of APTES (0-6 wt%) and characterized with various analytical techniques. The results showed that APTES affected considerably both the morphology and surface properties of the support layer. Afterwards, the polyamide (PA) layer was formed via an identical interfacial polymerization (IP). The separation experiments showed that modification of the support improved the performance of the TFC membranes, which stems from the improvement in the degree of cross-linking of the PVC structure. At an appropriate condition, permeate fluxes were 0.89 L.m(-2).h(-1).bar(-1) and 2.70 L.m(-2) .h(-1).bar(-1) for TFC membranes with pure and modified PVC support layers, respectively. Interestingly, there were no significant changes in salt rejection of the prepared membranes.
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