Formation kinetics and characterization of polyphthalazinone ether ketone hollow fiber ultrafiltration membranes

• Published in: Journal of membrane science 2012-02, Vol.389, p.416-423
• Main Authors: Yun, Yanbin, Le-Clech, Pierre, Dong, Guangxi, Sun, Dezhi, Wang, Yili, Qin, Peiyong, Chen, Zhen, Li, Jiding, Chen, Cuixian
• Format: Article
• Language: English
• Subjects: acetic acid; additives; artificial membranes; bacitracin; Chemical resistance; Chemistry; Colloidal state and disperse state; correlation; Exact sciences and technology; gelation; Gelation kinetics; General and physical chemistry; Hollow fiber membrane; hydrochloric acid; hydrogen peroxide; Membranes; nitric acid; PPEK; sodium hydroxide; sodium hypochlorite; sorption; Static sorption; sulfuric acid; Surface physical chemistry; synthetic fibers; ultrafiltration
• ISSN: 0376-7388; 1873-3123
• DOI: 10.1016/j.memsci.2011.11.007

► Effects of PEG600, Tween80 and OA additives on gelation kinetics were studied. ► Relation between the gelation kinetics and properties of PPEK membranes was analyzed. ► PPEK membrane chemical resistances were evaluated by a series of acid, alkaline and oxidative solutions. ► Static absorption ability of PPEK membranes was investigated with BSA and bacitracin solution. This paper reports an evaluation of the effect of both organic and inorganic additives on the gelation kinetics, morphology and separation properties of asymmetric poly(phthalazine ether ketone) (PPEK) hollow fiber ultrafiltration membranes. Using an online optical microscope-CCD camera for observation of precipitation front movement ( X), a good linear relationship between X 2 and time was observed for the whole gelation process with the correlation coefficient ( R 2) higher than 0.98. It was found that the pure water flux of membranes with additives were lower than neat PPEK membranes. This observation might be attributed to the decrease in the face gelation velocity caused by the extra organic additives. The water flux of PEG600 was higher than that of Tween80 at the same additive concentration. When OA concentration increased from 3.5 to 5.0 wt.%, the pure water flux increased from 332 to 367 L/m 2 h and the rejection decreased from 98.6 to 96.8%. The PPEK hollow fiber membranes exhibited finger-like macro-voids structure and a skin layer at the outer-most region of the hollow fiber. Evaluation of the membrane chemical resistance with various chemical solutions indicated that PPEK membranes had good chemical resistance against HCl, H 2SO 4, HNO 3, CH 3COOH, OA, NaOH and H 2O 2, while the NaClO solution can greatly damage the membrane mechanical strength. Static sorption tests of PPEK membrane revealed that PPEK membrane adsorbed more bacitracin than BSA due to the smaller size of bacitracin.