Kinetics of Photoinduced Wettability Switching on Nanoporous Titania Surfaces under Oil

Panchanathan, Divya; Kwon, Gibum; Qahtan, Talal F.; Gondal, M.A.; McKinley, Gareth H.

doi:10.1002/admi.201700462

Cited by 16 publications

(21 citation statements)

References 52 publications

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“…Manipulating the membrane’s wettability has been reported as an alternative to enhance its fouling resistance 22 – 25 . For example, membranes with hydrophilic (i.e., water contact angle < 90°) or superhydrophilic (i.e., water contact angle 0°) wettability can prevent adsorption of the organic substances (e.g., oil) to the surface by allowing water to form a thin film 26 – 28 .…”

Section: Introductionmentioning

confidence: 99%

“…An increase in the permeate flux upon light illumination has been attributed to the photocatalytic degradation of the organic substances deposited on the membrane surface 27 , 48 , 49 . Also, such photocatalytic membranes have demonstrated that they exhibit a time-dependent evolution of the surface chemistry heterogeneity (e.g., clean and contaminated regions) upon light illumination which can be quantitatively described by the contact angle measurements 6 , 22 , 50 – 52 . To our knowledge, quantitative relationships of the evolution of surface chemistry heterogeneity on a membrane surface and that of permeate flux upon visible light illumination are lacking.…”

Section: Introductionmentioning

confidence: 99%

“…For this, we fabricated a photocatalytic mesh utilizing a stainless steel mesh coated with nitrogen-doped TiO 2 (N-TiO 2 ) and perfluorosilane-grafted SiO 2 (F-SiO 2 ) nanoparticles mixture. A mathematical model was derived by integrating the Langmuir–Hinshelwood kinetic model of photocatalysis 22 , 30 and the Cassie–Baxter analysis of the contact angles for water on a photocatalytic surface 53 into a permeate flux relation 54 . The mathematical model was then utilized to predict the water-rich permeate flux through the photocatalytic mesh during visible light illumination.…”

Section: Introductionmentioning

confidence: 99%

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Predicting kinetics of water-rich permeate flux through photocatalytic mesh under visible light illumination

Shrestha

Ezazi

Rad

et al. 2021

Sci Rep

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Membrane-based separation technologies are attractive to remediating unconventional water sources, including brackish, industrial, and municipal wastewater, due to their versatility and relatively high energy efficiency. However, membrane fouling by dissolved or suspended organic substances remains a primary challenge which can result in an irreversible decline of the permeate flux. To overcome this, membranes have been incorporated with photocatalytic materials that can degrade these organic substances deposited on the surface upon light illumination. While such photocatalytic membranes have demonstrated that they can recover their inherent permeability, less information is known about the effect of photocatalysis on the kinetics of the permeate flux. In this work, a photocatalytic mesh that can selectively permeate water while repelling oil was fabricated by coating a mixture of nitrogen-doped TiO2 (N-TiO2) and perfluorosilane-grafted SiO2 (F-SiO2) nanoparticles on a stainless steel mesh. Utilizing the photocatalytic mesh, the time-dependent evolution of the water-rich permeate flux as a result of photocatalytic degradation of the oil was studied under the visible light illumination. A mathematical model was developed that can relate the photocatalytic degradation of the organic substances deposited on a mesh surface to the evolution of the permeate flux. This model was established by integrating the Langmuir–Hinshelwood kinetics for photocatalysis and the Cassie–Baxter wettability analysis on a chemically heterogeneous mesh surface into a permeate flux relation. Consequently, the time-dependent water-rich permeate flux values are compared with those predicted by using the model. It is found that the model can predict the evolution of the water-rich permeate flux with a goodness of fit of 0.92.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Predicting kinetics of water-rich permeate flux through photocatalytic mesh under visible light illumination

Shrestha

Ezazi

Rad

et al. 2021

Sci Rep

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“…Photocatalytic materials generate electron hole (e − ‐h + ) pairs upon irradiation of light with an energy greater than their bandgap energy ( E g ). [ 33 ] The electrons and holes react with ambient oxygen or water molecules and produce highly reactive radicals such as hydroxyl, [ 34–36 ] superoxide anion, [ 37 ] and peroxide. [ 38 ] These radicals oxidize (or reduce) the organic contaminants either dissolved in the water‐rich permeate or on the membrane, which results in decontamination of the permeate and membrane cleaning.…”

Section: Introductionmentioning

confidence: 99%

Selective Wettability Membrane for Continuous Oil−Water Separation and In Situ Visible Light‐Driven Photocatalytic Purification of Water

et al. 2020

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Recently, such membranes with selective wettability (i.e., hydrophilic and in air or underwater oleophobic) have been incorporated with a photocatalytic semiconductor (e.g., TiO 2 , [26] α-Fe 2 O 3 , [27] WO 3 , [28] BiVO 4 , [29] β-FeOOH, [30] g-C 3 N 4 , [31] and Membrane-based technologies are attractive for remediating oily wastewater because they are relatively energy-efficient and are applicable to a wide range of industrial effluents. For complete treatment of oily wastewater, removing dissolved contaminants from the water phase is typically followed by adsorption onto an adsorbent, which complicates the process. Here, an in-air superhydrophilic and underwater superoleophobic membrane-based continuous separation of surfactant-stabilized oil-in-water emulsions and in situ decontamination of water by visible-light-driven photocatalytic degradation of dissolved organic contaminants is reported. The membrane is fabricated by utilizing a thermally sensitized stainless steel mesh coated with visible light absorbing iron-doped titania nanoparticles. Post annealing of the membrane can enhance the adhesion of nanoparticles to the membrane surface by formation of a bridge between them. An apparatus that enables continuous separation of surfactant-stabilized oil-in-water emulsion and in situ photocatalytic degradation of dissolved organic matter in the water-rich permeate upon irradiation of visible light on the membrane surface with greater than 99% photocatalytic degradation is developed. The membrane demonstrates the recovery of its intrinsic water-rich permeate flux upon continuous irradiation of light after being contaminated with oil. Finally, continuous oil−water separation and in situ water decontamination is demonstrated by photocatalytically degrading model toxins in water-rich permeate.

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“…The effect of wettability on tribological property needs to be further studied [24, 25]. It is worth mentioning that surface wettability can be controlled by applying external stimuli, such as pH, light, electricity, and temperature, which provides a basis for investigating the influence of wettability on tribological performance [26–30].…”

Section: Introductionmentioning

confidence: 99%

Tribological performance of microstructured surfaces with different wettability from superhydrophilic to superhydrophobic

Zhang

Cui

Wang

et al. 2020

Biosurface and Biotribology

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Kinetics of Photoinduced Wettability Switching on Nanoporous Titania Surfaces under Oil

Cited by 16 publications

References 52 publications

Predicting kinetics of water-rich permeate flux through photocatalytic mesh under visible light illumination

Predicting kinetics of water-rich permeate flux through photocatalytic mesh under visible light illumination

Selective Wettability Membrane for Continuous Oil−Water Separation and In Situ Visible Light‐Driven Photocatalytic Purification of Water

Tribological performance of microstructured surfaces with different wettability from superhydrophilic to superhydrophobic

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