Conformal Nitrogen‐Doped TiO<sub>2</sub> Photocatalytic Coatings for Sunlight‐Activated Membranes

Lee, Anna; Libera, Joseph A.; Waldman, Ruben Z.; Ahmed, Aftab; Avila, Jason R.; Elam, Jeffrey W.; Darling, Seth B.

doi:10.1002/adsu.201600041

Cited by 70 publications

(45 citation statements)

References 31 publications

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“…ALD is a technique commonly used in microelectronics and semiconductor fabrication in which alternating vapor pulses react on a surface to enable layer‐by‐layer conformal growth . In such a conformal regime, ALD allows for membranes to be functionalized with metal oxides without substantially changing the pore geometry . Oxides grown on porous materials simply constrict the pore size and introduce a roughness associated with the particular metal oxide .…”

Section: Introductionmentioning

confidence: 99%

Janus Membranes via Diffusion‐Controlled Atomic Layer Deposition

Waldman

Yang

Mandia

et al. 2018

Adv Materials Inter

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The first use of atomic layer deposition (ALD) to produce Janus membranes is reported, with an example system consisting of a compositional gradient ranging from hydrophilic Al2O3 on one face to hydrophobic poly(propylene) on the opposite face. Alternating pulses of trimethyl aluminum and water vapor lead to the growth of covalently bonded Al2O3 conforming to the membrane pore surfaces. Precise control of ALD parameters significantly affects the surface wetting of the modified membrane face and the depth of Al2O3 infiltration into the porosity. This depth control derives from slow precursor diffusion through the 200 nm membrane pores compared to much faster ALD surface reactions. For a given precursor exposure and purge time, increasing the number of ALD cycles decreases the water contact angle at the modified surface from hydrophobic to hydrophilic, until the water droplet is completely imbibed by the membrane. To demonstrate the utility of these Janus membranes, a hydrophilic/superaerophobic Janus treatment is shown to greatly reduce the size of air bubbles generated through the membrane, enabling faster mixing. This technique represents the first application of vapor‐deposited covalently bonded metal oxides to form Janus membranes. Further opportunities are afforded by the ability to laterally pattern Al2O3 across the membrane surface via physical masking.

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Section: Introductionmentioning

confidence: 99%

Janus Membranes via Diffusion‐Controlled Atomic Layer Deposition

Waldman

Yang

Mandia

et al. 2018

Adv Materials Inter

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“…There are numerous methods of PMs production, for example: Atomic layer deposition (ALD) [57,70,71] and chemical vapor deposition [58]; 7.…”

Section: Pmrs With Immobilized Photocatalyst (Pmrs With Pms)mentioning

confidence: 99%

Overview of Photocatalytic Membrane Reactors in Organic Synthesis, Energy Storage and Environmental Applications

et al. 2019

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This paper presents an overview of recent reports on photocatalytic membrane reactors (PMRs) in organic synthesis as well as water and wastewater treatment. A brief introduction to slurry PMRs and the systems equipped with photocatalytic membranes (PMs) is given. The methods of PM production are also presented. Moreover, the process parameters affecting the performance of PMRs are characterized. The applications of PMRs in organic synthesis are discussed, including photocatalytic conversion of CO2, synthesis of KA oil by photocatalytic oxidation, conversion of acetophenone to phenylethanol, synthesis of vanillin and phenol, as well as hydrogen production. Furthermore, the configurations and applications of PMRs for removal of organic contaminants from model solutions, natural water and municipal or industrial wastewater are described. It was concluded that PMRs represent a promising green technology; however, before the application in industry, additional studies are still required. These should be aimed at improvement of process efficiency, mainly by development and application of visible light active photocatalysts and novel membranes resistant to the harsh conditions prevailing in these systems.

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“…It was reported that the prepared N-doped TiO 2 had excellent photocatalytic activity with complete the degradation of RR4 after 60 min [11]. In addition, conformal thin films of nitrogen doped TiO 2 on membranes have been fabricated of via atomic layer deposition (ALD) resulting in a lowered band gap with enhanced permeance and photocatalytic activity for degrading organic pollutants under solar irradiation [12]. Recently, an N-doped TiO 2 photocatayst was successfully synthesized through acid modified sol-gel method [13].…”

Section: Introductionmentioning

confidence: 99%

Visible-Light Active Photocatalytic Dual Layer Hollow Fiber (DLHF) Membrane and Its Potential in Mitigating the Detrimental Effects of Bisphenol A in Water

et al. 2020

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The presence of bisphenol A (BPA) in various water sources has potentially led to numerous adverse effects in human such as increased in blood pressure and derangement in liver function. Thus, a reliable treatment for the removing BPA is highly required. This present work aimed to study the efficiency of visible light driven photocatalytic dual-layer hollow fiber (DLHF) membrane for the removal of BPA from water and further investigated its detrimental effects by using an in-vivo model. The prepared membranes were characterized for their morphology, particles distribution, surface roughness, crystallinity and light absorption spectra. The removal of 81.6% and 86.7% in BPA concentration was achieved for N-doped TiO2 DLHF after 360 min of visible and UV light irradiation, respectively. No significant changes for all three groups were observed in liver function test meanwhile the rats-exposed to untreated BPA water shows significance blood pressure increment contrary to rats-exposed to treated BPA water. Similarly, the normal morphology in both jejunum and ileum were altered in rats-exposed to untreated BPA water group. Altogether, the presence of N-doped TiO2 in DLHF are shown to significantly enhance the photocatalytic degradation activity under visible irradiation, which effectively mitigates the effect of BPA in an in-vivo model.

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Conformal Nitrogen‐Doped TiO₂ Photocatalytic Coatings for Sunlight‐Activated Membranes

Cited by 70 publications

References 31 publications

Janus Membranes via Diffusion‐Controlled Atomic Layer Deposition

Janus Membranes via Diffusion‐Controlled Atomic Layer Deposition

Overview of Photocatalytic Membrane Reactors in Organic Synthesis, Energy Storage and Environmental Applications

Visible-Light Active Photocatalytic Dual Layer Hollow Fiber (DLHF) Membrane and Its Potential in Mitigating the Detrimental Effects of Bisphenol A in Water

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Conformal Nitrogen‐Doped TiO2 Photocatalytic Coatings for Sunlight‐Activated Membranes

Cited by 70 publications

References 31 publications

Janus Membranes via Diffusion‐Controlled Atomic Layer Deposition

Janus Membranes via Diffusion‐Controlled Atomic Layer Deposition

Overview of Photocatalytic Membrane Reactors in Organic Synthesis, Energy Storage and Environmental Applications

Visible-Light Active Photocatalytic Dual Layer Hollow Fiber (DLHF) Membrane and Its Potential in Mitigating the Detrimental Effects of Bisphenol A in Water

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Conformal Nitrogen‐Doped TiO₂ Photocatalytic Coatings for Sunlight‐Activated Membranes