Studying the Role of Common Membrane Surface Functionalities on Adsorption and Cleaning of Organic Foulants Using QCM-D

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• 作者：Alison E. Contreras ; Zvi Steiner ; Jing Miao ; Roni Kasher ; Qilin Li
• 刊名：Environmental Science & Technology
• 出版年：2011
• 出版时间：August 1, 2011
• 年：2011
• 卷：45
• 期：15
• 页码：6309-6315
• 全文大小：871K
• 年卷期：v.45,no.15(August 1, 2011)
• ISSN：1520-5851

文摘

Adsorption of organic foulants on nanofiltration (NF) and reverse osmosis (RO) membrane surfaces strongly affects subsequent fouling behavior by modifying the membrane surface. In this study, impact on organic foulant adsorption of specific chemistries including those in commercial thin-film composite membranes was investigated using self-assembled monolayers with seven different ending chemical functionalities (鈭扖H₃, 鈭扥鈥損henyl, 鈭扤H₂, ethylene-glycol, 鈭扖OOH, 鈭扖ONH₂, and 鈭扥H). Adsorption and cleaning of protein (bovine serum albumin) and polysaccharide (sodium alginate) model foulants in two solution conditions were measured using quartz crystal microbalance with dissipation monitoring, and were found to strongly depend on surface functionality. Alginate adsorption correlated with surface hydrophobicity as measured by water contact angle in air; however, adsorption of BSA on hydrophilic 鈭扖OOH, 鈭扤H₂, and 鈭扖ONH₂ surfaces was high and dominated by hydrogen bond formation and electrostatic attraction. Adsorption of both BSA and alginate was the fastest on 鈭扖OOH, and adsorption on 鈭扤H₂ and 鈭扖ONH₂ was difficult to remove by surfactant cleaning. BSA adsorption kinetics was shown to be markedly faster than that of alginate, suggesting its importance in the formation of the conditioning layer. Surface modification to render 鈭扥H or ethylene-glycol functionalities are expected to reduce membrane fouling.