Preparation and evaluation of poly(phthalazinone ether sulfone ketone) ultrafiltration membrane with organic and inorganic nano-TiO2 additives
The effects of additives of nano-TiO2, PEO–PPO–PEO/nano-TiO2, oxalic acid/nano-TiO2, and oxalic acid/PEO–PPO–PEO/nano-TiO2 on PPESK membrane performances and gelation kinetics mechanism were investigated in detail. When the single nano-TiO2 concentration increased from 0.2 to 1.0 wt%, the water flux and the rejection changed slightly at first and then reduced, and the gelation rate was the fastest for 0.6 wt% nano-TiO2. With the PEO–PPO–PEO concentration increasing from 1.0 to 5.0 wt% which contained 0.6 wt% nano-TiO2 in the casting solution, the water flux floated between 368 and 530 L/m2 h at first and then went up significantly to 1109 L/m2 h, the rejection diminished remarkably, and also the gelation rate increased. With the increase in oxalic acid concentration ranging from 1.0 to 3.0 wt% (including 0.6 wt% nano-TiO2 in the casting solution), all the water flux, the rejection, and gelation rate changed mildly. For oxalic acid/PEO–PPO–PEO/nano-TiO2 blend additives, with the oxalic acid concentration increasing from 1.0 to 2.5 wt% consisting 2.0 wt% PEO–PPO–PEO and 0.6 wt% nano-TiO2, the water flux and the rejection remained stable; however, the gelation rate accelerated. All the PPESK membranes in this study exhibited asymmetric finger-like structures.
KeywordsPPESK membrane Gelation kinetics PEO–PPO–PEO Nano-TiO2 Oxalic acid
This work was financially supported by “the National Nature Science Foundation of China (Grant No. 21376030)” and “the technological innovation project of instrument and equipment function development of Chinese Academy of Sciences (Grant No. Y12A011FF5)”.
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