This study is aimed at the synthesis of polysulfone ultrafiltration membrane (PSf), incorporating the same group choroethyl-choroacetate, then replace by hydrolysis by chloroethyl groups, in order to confer greater hydrophilicity and reduce the fouling effect. The performance of the membranes obtained is analyzed by permeation measurements of emulsified oily wastewater.
Carboxylated polysulfone (CPS), poly (1,4-phenylene ether ethersulfone) (PPEES), membranes were prepared and used for the separation of NaCl and CaCl2, in efficient way with less energy consumption. In this work, nanofiltration and reverse osmosis membranes were employed to the salt rejection behavior of the different salt solutions. The influence of applied pressure (1-12 bar), on the membrane performance was assessed. In CM series of membranes, CM1 showed maximum of 97% water uptake and 36% water swelling, whereas, CM4 showed 75% water uptake and 28% water swelling. In RCM series, RCM1 showed 85% water uptake and 32% water swelling whereas, in RCM4 it was 68% for water uptake and 20% for water swelling. Conclusively reverse osmosis membranes gave better rejection whereas nanofiltration membrane showed enhanced flux. CM1 showed 58% of rejection with 12 L/(m2 h) flux and RCM1 showed 55% of rejection with 15 L/(m2 h) flux for 0.1 wt.% NaCl solution. Whereas, in 0.1 wt.% CaCl2 solution, membrane CM1 showed 78% of rejection with 12 L/(m2 h) flux and RCM1showed 63% rejection with flux of 9 L/(m2 h).
carboxylated polysulfone; NF; RO; synthesis; rejection
Chitrakar Hegde : Department of Chemistry, Nitte Meenakshi Institute of Technology, Yelahanka, Bangalore-64, IndiaArun M Isloor, Mahesh Padaki : Membrane Technology Division, Department of Chemistry, National Institute of Technology-Karnataka, Surathkal, Mangalore 575 025, IndiaAhmad Fauzi Ismail and Lau W.J : Advanced Membrane Science & Technology Centre (AMTEC), Universiti Teknologi Malaysia,81310 UTM, Skudai, Johor, Malaysia
Synthesis and thermal properties of difunctional polysulfone ..
Chemical functionalization of polymers after the synthesis of membranes has great importance for various applications separative processes of industrial or environmental interest. Polysulfone (PSf) is one of the most applied polymers for separative processes used especially in membrane technology, due to its excellent chemical, mechanical and thermal properties. The functionalization of PSf makes it very attractive to give special characteristics due to their high hydrophobicity and membrane fouling fast. In this work PSf perform functionalization by the method of Friedel-Crafts with choroethyl chloroacetate and subsequent hydrolysis of chloroetyl group (-OH). After synthesizing the membrane is characterized by FT-IR ATR spectroscopy, 1HNMR, contact angle measurements, retention of polydisperse solutes and hydraulic permeability. Finally, the membranes tests fouling are performed with an oily wastewater emulsion. The fouling tests showed that the functionalized PSf membrane demonstrated significant anti-fouling property, suggesting the remarkable benefit for long-term operation in practical applications. Specifically, all the functionalized membranes reached almost 60% water flux recovery and were able to maintain the constant initial fluxes in filtration test, whereas the raw membrane only recovered 70.27% and suffered continuous decline. This promotion might be related to the increase of membrane surface hydrophilicity.