Solvent flux behavior and rejection characteristics of hydrophilic and hydrophobic mesoporous and microporous TiO2 and ZrO2 membranes

Dobrak, Agnieszka; Verrecht, Bart; Dungen, Hans Van den; Buekenhoudt, Anita; Vankelecom, Ivo F.J.; Bruggen, Bart Van der

doi:10.1016/j.memsci.2009.09.059

Cited by 60 publications

(22 citation statements)

References 34 publications

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“…As shown in Figure , the L p μ of the two kinds of BTESE membranes was not constant and clearly increased with temperature. Our group and others have observed a similar temperature dependency for inorganic NF membranes in water and many different organic solvents systems . Figure shows L p μ normalized with that at 25°C for the BTESE RO membranes in a comparison with the previous SiO 2 ‐ZrO 2 and TiO 2 NF membranes.…”

Section: Resultssupporting

confidence: 66%

Reverse osmosis performance of organosilica membranes and comparison with the pervaporation and gas permeation properties

Wang

Kanezashi

et al. 2012

AIChE Journal

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in Wiley Online Library (wileyonlinelibrary.com).Hybrid organosilica membranes were successfully prepared using bis(triethoxysilyl)ethane (BTESE) and applied to reverse osmosis (RO) desalination. The organosilica membrane calcined at 300 C almost completely rejected salts and neutral solutes with low-molecular-weight. Increasing the operating pressure led to an increase in water flux and salt rejection, while the flux and rejection decreased as salt concentration increased. The water permeation mechanism differed from the viscous flow mechanism. Observed activation energies for permeation were larger for membranes with a smaller pore size, and were considerably larger than the activation energy for water viscosity. The organosilica membranes exhibited exceptional hydrothermal stability in temperature cycles up to 90 C. The applicability of the generalized solution-diffusion (SD) model to RO and pervaporation (PV) desalination processes were examined, and the quantitative differences in water permeance were accurately predicted by the application of generalized transport equations. a Membrane type: aromatic polyamide; free chlorine tolerance: \0.1 ppm. 50 b Membrane type: aromatic polyamide; residual chlorine: zero. 50

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Section: Resultssupporting

confidence: 66%

Reverse osmosis performance of organosilica membranes and comparison with the pervaporation and gas permeation properties

Wang

Kanezashi

et al. 2012

AIChE Journal

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“…This software determines an effective diameter by taking into account three parameters: the molecular structure, the chemical bond length and the bonding angles of the molecules. Dobrak et al [48] demonstrated the procedure to use the software to calculate the effective solvent molecular diameters.…”

Section: Modeling Approachmentioning

confidence: 99%

“…Equation (9) is further challenged with rejection values from other studies [48]. Table 5 presents the results for parameter used in Equations (5)–(9).…”

Section: Modeling Approachmentioning

confidence: 99%

Mass Transport through Nanostructured Membranes: Towards a Predictive Tool

Darvishmanesh

Bruggen

2016

Membranes

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This study proposes a new mechanism to understand the transport of solvents through nanostructured membranes from a fundamental point of view. The findings are used to develop readily applicable mathematical models to predict solvent fluxes and solute rejections through solvent resistant membranes used for nanofiltration. The new model was developed based on a pore-flow type of transport. New parameters found to be of fundamental importance were introduced to the equation, i.e., the affinity of the solute and the solvent for the membrane expressed as the hydrogen-bonding contribution of the solubility parameter for the solute, solvent and membrane. A graphical map was constructed to predict the solute rejection based on the hydrogen-bonding contribution of the solubility parameter. The model was evaluated with performance data from the literature. Both the solvent flux and the solute rejection calculated with the new approach were similar to values reported in the literature.

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“…NF membranes have been applied to aqueous systems primarily for the purpose of water purification and other water-related applications [1][2][3][4][5]. Recently, much interest has been focused on NF for filtration and concentration of non-aqueous solutions.…”

Section: Introductionmentioning

confidence: 99%

Influence of polymer concentration in casting solution and solvent-solute-membrane interactions on performance of polyphenylsulfone (PPSU) nanofiltration membrane in alcohol solvents

Sani

Lau

Ismail

2014

Journal of Polymer Engineering

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In this work, the performances of solvent resistant nanofiltration (SRNF) membranes made of polyphenylsulfone (PPSU) were evaluated with respect to alcohol solvent (methanol, ethanol and isopropanol) flux and dye rejection. The experimental results showed that the solvent flux decreased while dye rejection increased with increasing polymer concentration in the casting solution from 17 wt% to 25 wt%. Apart from molecular size of the solute and viscosity of the solvent, the affinity between the solvent and the membrane was also confirmed to play a significant role in affecting the transport rate of the solvent through the membrane. With respect to the effect of solvent properties and solute size on the dye rejection of solvent-dye mixtures, it was found that the variation of dye rejection is governed by solvent-solute-membrane interactions. The solvent-solute interaction causes the same solute to have different solute size in each tested solvents, whereas the solvent-membrane interaction would result in a change in membrane pore size, leading to different separation efficiency. However, it must pointed out that solvent-membrane interaction is more pronounced compared to solvent-solute interaction, as the dye rejection of ethanol solution is reportedly higher than that of methanol, even though the size of solute in ethanol is smaller compared to its size in methanol.

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Solvent flux behavior and rejection characteristics of hydrophilic and hydrophobic mesoporous and microporous TiO2 and ZrO2 membranes

Cited by 60 publications

References 34 publications

Reverse osmosis performance of organosilica membranes and comparison with the pervaporation and gas permeation properties

Reverse osmosis performance of organosilica membranes and comparison with the pervaporation and gas permeation properties

Mass Transport through Nanostructured Membranes: Towards a Predictive Tool

Influence of polymer concentration in casting solution and solvent-solute-membrane interactions on performance of polyphenylsulfone (PPSU) nanofiltration membrane in alcohol solvents

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