Surface treatment of polyethersulfone membranes for applying in desalination by direct contact membrane distillation

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• 作者：A. Rastegarpanah ; H.R. Mortaheb ; ^{mortaheb@ccerci.ac.ir" class="auth_mail" title="E-mail the corresponding author}
• 关键词：Direct contact membrane distillation ; Hydrophobic membrane ; Polyethersulfone ; Tetraethylorthosilicate ; Trimethylchlorosilane
• 刊名：Desalination
• 出版年：2016
• 出版时间：1 January 2016
• 年：2016
• 卷：377
• 期：Complete
• 页码：99-107
• 全文大小：1913 K

文摘

In the present work, the surface of polyethersulfone (PES) membrane is treated by using tetraethylorthosilicate (TEOS) and trimethylchlorosilane (TMSCl) as grafting agents. Attenuated total reflection infrared spectroscopy (ATR-IR), scanning electron microscopy (SEM) coupled to an energy-dispersive X-ray spectrometer (EDX), atomic force microscopy (AFM), and optical contact angle measurement (OCA) are applied to identify and characterize the membranes. The water contact angle of as high as 150° is obtained for the treated membranes. The modified membranes are examined for desalination using a direct contact membrane distillation setup. Effects of different conditions in membrane preparation as well as operating parameters are investigated. A separation factor of 99.7% and comparable permeate fluxes to those of a commercial polytetrafluoroethylene (PTFE) membrane are obtained.