The effect of functionalized SiO2 nanoparticles on the morphology and triazines separation properties of cellulose acetate membranes

다국어 초록 (Multilingual Abstract)

This study investigates the removal of triazines from an aqueous solution using a novel SiO2/CAnanocomposite membrane. The membranes were fabricated with phase inversion by dispersing SiO2nanoparticles in the CA casting solutions in the range of 0.01–0.1 wt.%. ATR-IR, FESEM, AFM, and contactangle analyses were employed to characterize the prepared membranes. The effect of silicananoparticles on the performance of membranes was studied through the pure water flux and MgSO4rejection obtained at an applied pressure of 10 bars. Nanocomposite CA membranes generally showedhigher salt rejection and experienced less flux than neat CA membranes, due to morphology changes. Inaddition, the observed salt rejection tended to enhance as silica loading increased up to a criticalconcentration. Three triazines (atrazine, propazine, and prometryn) were removed from water by theprepared membranes, and their rejections were compared. The results showed that the triazinesrejection was increased by pressure and feed concentration. The effects of the molecules’ properties,including molecular size, hydrophobicity and dipole moment, were studied. The results revealed that therejection of prometryn with a larger molecular size was always higher than the other two triazines. Itwas observed that there was a direct relation between dipole moment and triazine rejection, while thisrelation was not observed in the case of hydrophobicity.

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