Adsorption of hydrophobic compounds onto NF/RO membranes: an artifact leading to overestimation of rejection

Kimura, Katsuki; Amy, Gary L.; Drewes, Jörg E.; Watanabe, Yoshimasa

doi:10.1016/s0376-7388(03)00248-5

Cited by 284 publications

(199 citation statements)

References 16 publications

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“…A longer operating time was used to reach the saturated state. The required time for membrane saturation depends on the feed concentration (Zhai et al, 2014;Kimura et al, 2003). A higher feed concentration requires a lower operating time to reach the saturated state (steady-state condition) (Zhai et al, 2014).…”

Section: Membrane Performance Measurementsmentioning

confidence: 99%

Preparation, characterization and performance of poly( m -phenylene isophthalamide)/organically modified montmorillonite nanocomposite membranes in removal of perfluorooctane sulfonate

Luo

Liu

et al. 2016

Journal of Environmental Sciences

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Nanocomposite membranes containing poly(m-phenylene isophthalamide) (PMIA) and organically modified montmorillonite (OMMT) were prepared by a combination of solution dispersion and wet-phase inversion methods, and the effects of OMMT addition on the properties and performance of fabricated nanofiltration membranes were investigated. The membranes were characterized by contact angle measurements, scanning electron microscopy (SEM), atomic force microscopy (AFM), thermogravimetric analysis, and zeta potential.The performance of the membranes was elucidated by the removal of perfluorooctane sulfonate (PFOS) at neutral pH. Increasing OMMT concentration improved the thermal stability and hydrophilicity of the membranes. The permeation and rejection of PFOS were significantly improved. The performance of fabricated nanofiltration membranes in removal of PFOS varied depending on the solute and membrane properties as well as solution conditions. Finally, a comparison between fabricated membranes and a commercial NF membrane (ESNA1-K1, Hydecanme) proved that the OMMT addition is a convenient procedure for producing nanocomposite membranes with superior properties and performance.

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Section: Membrane Performance Measurementsmentioning

confidence: 99%

Preparation, characterization and performance of poly( m -phenylene isophthalamide)/organically modified montmorillonite nanocomposite membranes in removal of perfluorooctane sulfonate

Luo

Liu

et al. 2016

Journal of Environmental Sciences

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“…Until saturation of the membrane sites is achieved the real retention is overestimated [63,64,91]. While adsorption occurs, the apparent retention is often >90% but once the membrane becomes saturated this latter decreases drastically, sometimes to <10% [63,64,55,56,80].…”

Section: Adsorptionmentioning

confidence: 99%

“…It is therefore important to understand how adsorption occurs and what governs it. Adsorption on the membrane is highly dependent on the membrane material used [66,63], the contaminant and their properties. The solution chemistry, such as pH and ionic strength, also affects adsorption on the membranes.…”

Section: Adsorptionmentioning

confidence: 99%

“…FIGURE6 Operational conditions such as flow and pressure can also affect xenobiotics adsorption. When comparing batch adsorption (membrane exposed to xenobiotic without pressure) with adsorption obtained in pressurised experiments, higher adsorption and lower extraction is obtained in the latter showing adsorption occurs either inside the pores [63,103] or is enhanced by pressure.…”

Section: Adsorptionmentioning

confidence: 99%

“…estrone at pH>10.3). When this occurs, charge repulsion between the membrane surface charge and the dissociated compound occur enhancing the retention of the xenobiotic [136,63,64,93,94,144,95,145,80]. This effect is especially pronounced with molecules smaller than the pore size of the membrane.…”

Section: Charge Repulsionmentioning

confidence: 99%

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Xenobiotics Removal by Membrane Technology: An Overview

Semiao

Schäfer

2009

Environmental Pollution

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Small molecular weight xenobiotics are compounds of extreme concern in potable water applications due to their adverse human health and environmental effects. However, conventional water treatment processes cannot fully and systematically remove them due to their low concentrations in natural waters and wastewaters. Biological limitation to degrade such compounds is another cause for inefficient removal.Physical barriers like membranes possessing pore sizes smaller than the compounds to be removed emerged as a good solution. Nanofiltration and reverse osmosis proved to be quite effective for xenobiotics removal in potable water production in the Paris purification plant of Méry-sur-Oise. However, even these very narrow pore membrane processes may result in incomplete removal: xenobiotics retention is high but factors such as adsorption, size exclusion and charge repulsion affect unpredictably their retention. The water solutions complexity to be treated renders xenobiotics removal predictions even more difficult due to interactions between xenobiotics and compounds in water.Removal of xenobiotics by microfiltration and ultrafiltration is very low because adsorption on the membrane is the main retention mechanism. Combining those with other processes (e.g. activated carbon) can considerably improve xenobiotics removal.The least studied processes in xenobiotics removal are electrodialysis, membrane distillation and pervaporation. Electrodialysis removal of organic xenobiotics shows a breakthrough through the membrane possibly due to adsorption followed by diffusion. Membrane distillation presents high removal rates of xenobiotics due to the compounds low vapour pressure. For volatile organic xenobiotics or solutions of trace amounts both membrane distillation and pervaporation can be used, xenobiotics interaction with the membrane being the key factor.In this book chapter a thorough synopsis of current knowledge on xenobiotics removal is presented and balanced with recent fundamental studies of underlying mechanisms, informing both the practitioner regarding membrane capabilities for xenobiotics removal and the researcher with the current state-of-art.

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Solution‐Diffusion Processes

Verliefde

Meeren

Bruggen

2013

Encyclopedia of Membrane Science and Technology

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The solution‐diffusion model has been widely used to describe solute and solvent transport through high pressure membranes. The main proposition of the theory is that the driving force is a gradient in (electro)chemical potential. This makes the theory applicable to all dense membrane processes because common membrane driving forces such as gradients in temperature, electromotive forces, concentration, and pressure can in fact be translated to (electro)chemical potential gradients. This review describes the origin of the solution‐diffusion model and the premises on which it was built. The theory is derived in more detail for reverse osmosis and the strong and weak points are highlighted. Possible adaptations such as convection–diffusion models and extended Nernst–Planck approaches are elaborated on.

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Adsorption of hydrophobic compounds onto NF/RO membranes: an artifact leading to overestimation of rejection

Cited by 284 publications

References 16 publications

Preparation, characterization and performance of poly( m -phenylene isophthalamide)/organically modified montmorillonite nanocomposite membranes in removal of perfluorooctane sulfonate

Preparation, characterization and performance of poly( m -phenylene isophthalamide)/organically modified montmorillonite nanocomposite membranes in removal of perfluorooctane sulfonate

Xenobiotics Removal by Membrane Technology: An Overview

Solution‐Diffusion Processes

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