Preparation and Characterization of Thin-Film Composite Reverse Osmosis Membrane on a Novel Aminosilane-Modified Polyvinyl Chloride Support

Abstract

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.

Nanoparticles modified Polyacrylonitrile/Polyacrylonitrile – Polyvinylidenefluoride blends as substrate of high flux anti‐fouling nanofiltration membranes

“…The water flux of TFC membrane prepared on mixed matrix PVC substrate was 2.70 Lm‐2.h‐1.bar‐1 whereas it was 0.89 Lm‐2.h‐1.bar‐1 for TFC membrane prepared on virgin PVC substrate. However no significant difference in salt rejection was observed for both the types of TFC membranes 39 . Several factors like material properties, percent porosity, pore size and morphology, surface roughness, hydrophilicity of the support layer play important role in the separation performance and interfacial properties of TFC membranes 39 …”

“…39 Several factors like material properties, percent porosity, pore size and morphology, surface roughness, hydrophilicity of the support layer play important role in the separation performance and interfacial properties of TFC membranes. 39 Present work relates to the modification of the substrate layer of TFC NF membranes through incorporation of NPs. Two different types of substrates have been chosen namely PAN and PAN-PVDF blends and the selected NPs are SiO 2 and TiO 2 .…”

Oily Wastewater Treatment Using Polyamide Thin Film Composite Membrane Technology

“…At the membrane surface, permeate flow rate reduces with time and concentration polarization increases. A decrease in flux was recorded as a result of increased mass transfer resistance, so fouling is often considered in the form of decreasing permeate flux over time [45][46][47][48][49]. Membrane blocking leads to a decrease in membrane performance because of suspended solids accumulating on the outer layer.…”

Thin-Film Nanocomposite Forward Osmosis Membranes Prepared on PVC Substrates with Polydopamine Functionalized Zr-Based Metal Organic Frameworks

“…They contain two different layers that can be optimized separately: a very thin polyamide (PA) active layer synthesized by interfacial polymerization (IP) reaction between two monomers and a substrate fabricated by phase inversion technique. − It is preferable for the substrate of TFC membranes to minimize the internal concentration polarization (ICP) by decreasing the structural parameter ( S ) . Polyvinyl chloride (PVC) has recently attracted attention for membrane fabrication due to its low cost, ease of modification, superior mechanical and thermal stability, ease of dissolution in various solvents, and strong chemical resistance to different materials such as chlorine, acids, etc. − However, only a few studies have used PVC polymer as a substrate of TFC membranes. − Alternatively, in the case of the PA layer, many efforts have been focused on improving FO membranes in terms of permeability, selectivity, and antifouling characterizations . One approach is the introduction of nanoparticles (NPs) in the organic/aqueous solution during the IP technique which is named the thin film nanocomposite (TFN) membrane .…”