Effect of silica on the properties of cellulose acetate/polyethylene glycol membranes for reverse osmosis

Abstract

• 2-stage phase inversion protocol; involving TIPS and controlled evaporation.• Silica is used as an additive to augment permeation performance.• Addition of silica enhanced the fouling resistance remarkably.• Optimum loading of silica particle is required for maximum performance. In this work, a series of cellulose acetate/polyethylene glycol-600 membranes, with varying ratios were prepared by 2-stage phase inversion protocol. The permeation properties were studied by subjecting membranes in indigenously fabricated reverse osmosis plant. After optimization of different CA/PEG ratios, the membrane with highest salt rejection capacity was selected and modified with varying amount of silica. The Modified membranes were characterized for their permeation properties, hydrophilicity, compositional analysis, thermal stability, mechanical strength and morphological studies. Silica significantly influenced the permeation performance of composite membrane. The flux enhanced from 0.35 to 2.46 L/h m 2 along with an 11.41% relative increase in salt rejection. a b s t r a c t a r t i c l e i n f oThe hydrophilicity was significantly enhanced by the addition of silica. In FTIR spectra, the broadening of the peak around 3500 cm −1 and emergence of peak at 950 cm −1 specified the incorporation of silica particles. The thermal analysis indicated the relative increase in degradation temperature (T max ) and glass transition temperature (T g ) for CPS-5 membrane. The mechanical stability of the modified membranes, increased initially, but declined with further addition of silica. The results indicated that the incorporation of SiO 2 content in the casting solution improved the fouling resistance of the membranes.

Enhancing Properties and Performance of Cellulose Acetate/Polyethylene Glycol (CA/PEG) Membrane with the addition of Titanium Dioxide (TiO2) by Using Surface Coating Method

“…Cellulose acetate/polyethylene glycol (CA/PEG) membrane has been observed by Ahmad et al and the result shows that CA/PEG with composition 80/20 has the best performance in salt rejection and flux permeate [7]. The pore number and flux permeate of the cellulose membrane can be increased by the addition of PEG and it is hydrophilic material [8].…”

Synthesis, characterization and permeation performance of cellulose acetate/polyethylene glycol-600 membranes loaded with silver particles for ultra low pressure reverse osmosis

“…According to this model, transport process within the membrane involves three steps: 1) sorption at the surface of the membrane, 2) diffusion into dense membrane under pressure, and 3) desorption. The hydrophilic nature of PEG acts as driving force for sorption of water into the membrane [41].…”

Enhanced water flux through ultrafiltration polysulfone membrane via addition‐removal of silica nano‐particles: Synthesis and characterization

“…Their study showed that the silica particle significantly influences the permeation performance of composite membrane. Furthermore, their result revealed that the incorporation of SiO 2 content in the casting solution improves the fouling resistance of the membranes …”