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    Adsorption-desorption study of oil emulsion towards thermo- responsive PVDF/SiO2-PNIPAM composite membrane

    Year: 2017

    Journal: J. Environ. Chem. Eng., Volume 5, OCT, page 4471–4482

    Authors: Ngang, H. P.; Ahmad, A. L.; Low, S. C.; Ooi, B. S.

    Keywords: Thermo-responsive; Composite membrane; Oil fouling; Quartz crystal microbalance with dissipation; Actuation force

    Thermo-responsive polyvinylidene fluoride/silica-poly (N-isopropylacrylamide) (PVDF/SiO2-PNIPAM) composite membrane was prepared and evaluated for its oil adsorption and desorption capability. The role of oil concentrations and solution salinity on adsorption efficiency were evaluated and related to the membrane surface physicochemical properties. Quartz crystal microbalance with dissipation (QCM-D) was used to analyze the foulants characteristic and adsorption kinetics in both the pure and saline water. It was found that the composite membrane showed lower oil adsorption tendency in pure water compared to the neat PVDF membrane due to the hydrophilic nature of PNIPAM. However, by increasing the solution salinity, oil adsorption on both membranes were marginally different due to the salting out effect of the PNIPAM. Nonetheless, it was proven via the desorption study that under alternated thermal cycle, the shrinking and swelling actions of the PNIPAM particles provided an actuation force that could detach around 20% of the adsorbed oil layer from the membrane surface. The functionality of the thermo-responsive composite membrane was further proven by filtration study under pressurized condition.
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