A fundamental study of adsorption kinetics of surfactants onto metal oxides using quartz crystal microbalance with dissipation (QCM-D)
AuthorsMedina, Sandra Constanza
Farinha, Andreia S.F.
Emwas, Abdul-Hamid M.
Tabatabai, S. Assiyeh Alizadeh
KAUST DepartmentEnvironmental Science and Engineering Program
Water Desalination and Reuse Center (WDRC), King Abdullah University of Science and Technology (KAUST), Thuwal, 23955-6900, Saudi Arabia
Water Desalination and Reuse Research Center (WDRC)
Biological and Environmental Sciences and Engineering (BESE) Division
Online Publication Date2019-11-16
Print Publication Date2020-02
Embargo End Date2021-11-16
Permanent link to this recordhttp://hdl.handle.net/10754/660164
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AbstractHypothesis Membrane fouling challenges the viability of oil-field produced water (PW) treatment with ceramic membranes. Surfactants play an important role in irreversible fouling through adsorption phenomena. However, previous studies have shown contradictory results. Hence, a fundamental understanding of surfactants-metal oxides interactions is necessary. Experiments In this work, we assessed the adsorption interactions of anionic SDBS and cationic CTAB with titania, zirconia and alumina surfaces, using the quartz crystal microbalance with dissipation (QCM-D) technique. Findings We found that electrostatic interactions controlled the adsorption of SDBS onto all the surfaces studied, with titania being the most likely to adsorb SDBS. On the contrary, CTAB was adsorbed regardless of the overall metal oxide surface charge. CTAB showed a two-step adsorption at acidic pH (3.0). In the first step, a rigid film was formed with a smaller adsorption capacity compared to the neutral (6.8) and basic (9.4) pH conditions. In the second step, a viscoelastic film was formed. Our results suggest that adsorption was driven by the nature of the surfactant rather than the metal oxide properties. This implies that electrostatic interactions should not be taken as the only predicting factor of adsorption phenomena in the understanding of PW fouling in ceramic membranes as other supramolecular interactions are strongly involved.
CitationMedina, S. C., Farinha, A. S. F., Emwas, A.-H., Tabatabai, A., & Leiknes, T. (2019). A fundamental study of adsorption kinetics of surfactants onto metal oxides using quartz crystal microbalance with dissipation (QCM-D). Colloids and Surfaces A: Physicochemical and Engineering Aspects, 124237. doi:10.1016/j.colsurfa.2019.124237
SponsorsThe research reported in this publication was supported by funding from King Abdullah University of Science and Technology (KAUST). The authors are grateful for the input from Asst. Prof. Dr. Himanshu Mishra and Dr. Adriano Santana from Water Desalination and Reuse Center at KAUST. The abstract art and Fig. 3d were created by Heno Hwang, scientific illustrator at KAUST.