Mechanistic study of fouling hybrid PES-ionic liquid ultrafilter membrane during oily wastewater treatment; effect of surfactant type, salinity, and pH

IF 5.3 2区化学 Q2 CHEMISTRY, PHYSICAL

Journal of Molecular Liquids Pub Date : 2025-03-20 DOI:10.1016/j.molliq.2025.127320

Mohammad Tajik , Mostafa Lashkarbolooki , Majid Peyravi

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引用次数: 0

Abstract

Every day, a large amount of oily wastewater is produced by various industries, which, if not treated, will bring many environmental risks. Membrane-based filtration processes showed excellent performance but suffer from fouling phenomena that severely affect membrane performance and lifespan. Even though the PES-ionic liquid hybrid ultrafilter membrane can improve the flux, rejection, and fouling resistance, the influence of wastewater conditions on the fouling phenomenon and its mechanism and type has not been evaluated yet. To reveal the type of deposition, in addition to modeling the flux data using one- and two-parameter Hermia equations, FESEM, zeta potential, interfacial tension, and contact angle before and after deposition were evaluated to reveal the mechanism and cause of deposition in two cases including the hybrid PES-ionic liquid membranes made by [C₁₂mim][Cl] and [C₁₈mim][Cl] ionic liquids, named M5-CL12 and M0.5-CL18, respectively. To achieve the goal, effluents were prepared with different types of surfactants (from three families of anionic, cationic, and non-ionic) and in different salinities of sodium chloride (10, 50, and 100 mM) and acidic and alkaline pH. Implementing alterations in wastewater leads to modifications in wastewater properties like zeta potential and average particle size, which significantly affect particle-membrane interactions, including electrostatic interactions, and subsequently impact fouling. In addition, the effect of the chain length of ionic liquids induced on the membrane in different states was investigated. M5-CL12 membrane had higher flux in all conditions except for the alkaline solution (pH = 11). Fouling in the one-parameter state was primarily due to cake layer formation, while in the two-parameter state, cake-complete blocking and cake-intermediate blocking mechanisms were dominant. The fouling mechanism is mainly affected by the surface charge, particle size, and the propensity of particles to adhere to the membrane surface, determining the type of fouling observed. The membranes showed their best performance for oily effluents containing anionic surfactants, no salinity, and high pH with a flux of 496.03 L/m².h and 505.95 L/m².h for M5-CL12 and M0.5-CL18 membranes.

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来源期刊

Journal of Molecular Liquids 化学-物理：原子、分子和化学物理

CiteScore

10.30

自引率

16.70%

发文量

2597

审稿时长

78 days

期刊介绍： The journal includes papers in the following areas: – Simple organic liquids and mixtures – Ionic liquids – Surfactant solutions (including micelles and vesicles) and liquid interfaces – Colloidal solutions and nanoparticles – Thermotropic and lyotropic liquid crystals – Ferrofluids – Water, aqueous solutions and other hydrogen-bonded liquids – Lubricants, polymer solutions and melts – Molten metals and salts – Phase transitions and critical phenomena in liquids and confined fluids – Self assembly in complex liquids.– Biomolecules in solution The emphasis is on the molecular (or microscopic) understanding of particular liquids or liquid systems, especially concerning structure, dynamics and intermolecular forces. The experimental techniques used may include: – Conventional spectroscopy (mid-IR and far-IR, Raman, NMR, etc.) – Non-linear optics and time resolved spectroscopy (psec, fsec, asec, ISRS, etc.) – Light scattering (Rayleigh, Brillouin, PCS, etc.) – Dielectric relaxation – X-ray and neutron scattering and diffraction. Experimental studies, computer simulations (MD or MC) and analytical theory will be considered for publication; papers just reporting experimental results that do not contribute to the understanding of the fundamentals of molecular and ionic liquids will not be accepted. Only papers of a non-routine nature and advancing the field will be considered for publication.