| With the accelerating development of economic and social globalization, the pollution of water is becoming more and more deteriorated. The traditional process of purification and treatment is limited, which could not meet the current require of the removal of organic pollutants. However, as concerned as this point, the technology of ultrafiltration membrane separation with especial characteristics would be benefit of the requirements.Ultrafiltration membrane is a core part of such technology. Polyethersulfone (PES) ultrafiltration membranes that exhibiting excellent thermal stability, good mechanical strength and chemical stability, is the one of popular used membranes.Polyethylene glycol (PEG) is one kind of widely used water-soluble additives, and it is also one of good porogens. PEG would improve the flux amount of water when it is added into polyethersulfone ultrafiltration.In this study, the effects of different molecular weight of PEG on the performance of the PES membrane were investigated. PEG10000, PEG6000, PEG400 were selected as additives. It was found that the higher water flux was observed compared with the simple PES membrane. More importantly, the results showed that the maximum water flux of 355.971L/ (m2/h) was obtained in the system with PES membrane containing PEG10000.High rejection rates in the range of 96 to 100% were found in all three investigated systems. It is because that PEG is a non-solvent additive, namely, the bigger molecular weight, the greater non-stability of the thermodynamic properties of the solution, thus, both the exchange between solvent and non-solvent and the phase separation become faster. Consequently, with the increment of PEG molecular weight, the amount of surface pores and the size of pore increase, therefore, the water flux of ultrafiltration membrane is increased correspondingly.
|
PDF Full Text Request