Hydrothermal stability and permeation properties of TiO2-ZrO2 (5/5) nanofiltration membranes at high temperatures

Anisah, Sofiatun; Kanezashi, Masakoto; Nagasawa, Hiroki; Tsuru, Toshinori

doi:10.1016/j.seppur.2018.12.006

Cited by 20 publications

(12 citation statements)

References 35 publications

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“…(a) Enthalpic and (b) entropic barriers measured for the transport of water (blue spheres), ions (purple spheres), and neutral solutes (orange spheres) in RO (left panel) and NF (right panel) membranes. The studies are grouped based on the main parameter tested: pore size (yellow rectangle), ,− molecular size (red rectangle), ,− specific interactions (green rectangle), ,,− and the dehydration phenomenon (purple rectangle). ,,− ,− Important trends discussed in the main text are highlighted and indicated in italic fonts. Up and down arrows next to a specific tested parameter (i.e., pore size and molecular size) indicate whether the enthalpic or entropic barriers increase or decrease, respectively, with increasing the value of the specific tested parameter.…”

Section: Application Of Transition-state Theory To Transport In Salt-...mentioning

confidence: 99%

“…Generally, a larger molecular size (Figure a, red rectangle) induces higher enthalpic barriers due to the higher number of interactions between the transported species and the polymer that must be overcome during diffusion jumps. , Also, larger diffusing species must penetrate through larger openings in the polymer, which may require higher energies to form . However, the effect of molecular size on the enthalpic barrier does not always show a clear trend, suggesting that barriers to transport are largely dependent on the specific interactions (e.g., electrostatic and hydrogen bonding) between the transported species and the polymer, rather than just on the species’ size. , More systematic studies exploring the effect of such interactions on the enthalpic barrier (Figure a, green rectangle) expose their major contribution to the transport. For example, it was shown that a molecule with higher H-bonding ability, despite being smaller, experiences a higher enthalpic barrier compared to a larger molecule with a lower H-bonding ability .…”

Section: Application Of Transition-state Theory To Transport In Salt-...mentioning

confidence: 99%

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Applying Transition-State Theory to Explore Transport and Selectivity in Salt-Rejecting Membranes: A Critical Review

Shefer

Lopez

Straub

et al. 2022

Environ. Sci. Technol.

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Membrane technologies using reverse osmosis (RO) and nanofiltration (NF) have been widely implemented in water purification and desalination processes. Separation between species at the molecular level is achievable in RO and NF membranes due to a complex and poorly understood combination of transport mechanisms that have attracted the attention of researchers within and beyond the membrane community for many years. Minimizing existing knowledge gaps in transport through these membranes can improve the sustainability of current water-treatment processes and expand the use of RO and NF membranes to other applications that require high selectivity between species. Since its establishment in 1949, and with growing popularity in recent years, Eyring’s transition-state theory (TST) for transmembrane permeation has been applied in numerous studies to mechanistically explore molecular transport in membranes including RO and NF. In this review, we critically assess TST applied to transmembrane permeation in salt-rejecting membranes, focusing on mechanistic insights into transport under confinement that can be gained from this framework and the key limitations associated with the method. We first demonstrate and discuss the limited ability of the commonly used solution-diffusion model to mechanistically explain transport and selectivity trends observed in RO and NF membranes. Next, we review important milestones in the development of TST, introduce its underlying principles and equations, and establish the connection to transmembrane permeation with a focus on molecular-level enthalpic and entropic barriers that govern water and solute transport under confinement. We then critically review the application of TST to explore transport in RO and NF membranes, analyzing trends in measured enthalpic and entropic barriers and synthesizing new data to highlight important phenomena associated with the temperature-dependent measurement of the activation parameters. We also discuss major limitations of the experimental application of TST and propose specific solutions to minimize the uncertainties surrounding the current approach. We conclude with identifying future research needs to enhance the implementation and maximize the benefit of TST application to transmembrane permeation.

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Section: Application Of Transition-state Theory To Transport In Salt-...mentioning

confidence: 99%

Section: Application Of Transition-state Theory To Transport In Salt-...mentioning

confidence: 99%

Applying Transition-State Theory to Explore Transport and Selectivity in Salt-Rejecting Membranes: A Critical Review

Shefer

Lopez

Straub

et al. 2022

Environ. Sci. Technol.

View full text Add to dashboard Cite

show abstract

“…Considerable effort has been devoted to nanofiltration (NF) modelling and several approaches can be found in the literature [ 1 , 2 , 3 , 4 , 5 , 6 , 7 ]. Nonetheless, the intricacy of the transport mechanisms of NF complicates the development of predictive models, in particular for multielectrolyte solutions containing both mono and divalent ions.…”

Section: Introductionmentioning

confidence: 99%

“…On the other hand, irreversible thermodynamics uses only phenomenological coefficients to describe ion fluxes in terms of gradients of ion electrochemical potentials and transmembrane volume flow. This treatment combined with some assumptions leads to simplified models such as Spiegler–Kedem [ 4 , 7 ], extended Spiegler–Kedem [ 8 ], solution-diffusion [ 9 ] or solution–diffusion–electromigration [ 10 ].…”

Section: Introductionmentioning

confidence: 99%

Nanofiltration of Multi-Ion Solutions: Quantitative Control of Concentration Polarization and Interpretation by Solution-Diffusion-Electro-Migration Model

Labastida

Yaroshchuk

2021

Membranes

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For effective use of advanced engineering models of nanofiltration quality of experimental input is crucial, especially in electrolyte mixtures where simultaneous rejections of various ions may be very different. In particular, this concerns the quantitative control of concentration polarization (CP). This work used a rotating disklike membrane test cell with equally accessible membrane surface, so the CP extent was the same over the membrane surface. This condition, which is not satisfied in the conventional membrane test cell, made possible correcting for CP easily even in multi-ion systems. Ion rejections were studied experimentally for several dominant salts (NaCl, MgCl2, Na2SO4 and MgSO4) and trace ions (Na+, NH4+, Cl− and NO3−) using NF270 membrane. The solution–diffusion–electro–migration model was used to obtain ion permeances from the experimental measurements. The model could well fit the experimental data except in the case of NH4+. The correlations between the ion permeances and type of dominant salt are discussed in the context of the established mechanisms of NF such as Donnan and dielectric exclusion. The obtained information contributes to the systematic transport characterization of NF membranes and may be ultimately useful for computational fluid dynamics simulations of the performance of the membranes in various applications.

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“…The investigation of hydrothermal stability and the effect of permeation temperature on the transport mechanism of neutral solutes and water through TiO2-ZrO2 (5/5) NF membranes, based on the Spiegler-Kedem model were carried out by Anisah et al (2019). They realized that the permeation properties of neutral solutes and water according to the Spiegler-Kedem analysis were activated processes.…”

Section: Introductionmentioning

confidence: 99%

Modelling Ion Transport in an Amine Solution Through a Nanofiltration Membrane

Ghorbani

Bayati

Kikhavani

2019

Braz. J. Chem. Eng.

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The performance of a flat sheet polyamide nanofiltration membrane in rejection of a binary mixture of heat stable salts (acetate and sulfate) from methyl-diethanolamine (MDEA) solution was investigated. The effects of pressure and concentration of MDEA solution on rejection of acetate and sulfate ions were studied. At MDEA concentration of 20% wt. and pressure of 70 bar, 80% and 98% rejection can be obtained for acetate and sulfate ions, respectively. Membrane performance and transport coefficients were investigated using the Spiegler-Kedem-Katchalsky (SKK) model, film theory and extended Nernst-Planck (FT-ENP) model. The results of the FT-ENP model show accurate agreement with experimental results. This result can be obtained due to considering the charge repulsion of sulfate ions. For sulfate ions, both models show errors less than 1% with >R 2 =0.98. In the case of acetate, errors less than 3% (>R 2 =0.75) and 2% (>R 2 =0.89) were obtained for the SKK and FT-ENP models, respectively.

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Hydrothermal stability and permeation properties of TiO2-ZrO2 (5/5) nanofiltration membranes at high temperatures

Cited by 20 publications

References 35 publications

Applying Transition-State Theory to Explore Transport and Selectivity in Salt-Rejecting Membranes: A Critical Review

Applying Transition-State Theory to Explore Transport and Selectivity in Salt-Rejecting Membranes: A Critical Review

Nanofiltration of Multi-Ion Solutions: Quantitative Control of Concentration Polarization and Interpretation by Solution-Diffusion-Electro-Migration Model

Modelling Ion Transport in an Amine Solution Through a Nanofiltration Membrane

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