Fabrication of zinc oxide nanostructure coated membranes for efficient oil/water separation

Huang, Allen; Chen, Liang-Hsun; Kan, Chia-Chi; Hsu, Tien-Pen; Wu, Su-En; Jana, Karun Kumar; Tung, Kuo‐Lun

doi:10.1016/j.memsci.2018.09.007

Cited by 86 publications

(19 citation statements)

References 58 publications

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“…These findings suggested that the ZnO-coated filter membrane could separate a variety of O/W emulsions. Though the separation efficiency obtained in this study was similar with previous studies using inorganic coating materials (Nano-ZnO and Nano-TiO 2 ) to separate oil-in-water emulsions, we obtained a higher separation flux performance than these studies [ 41 , 42 , 43 ]. In addition, the as-prepared filter membrane was evaluated by a ten-times recycling separation of the dodecane/water emulsion to indicate the characteristic of reusability.…”

Section: Resultssupporting

confidence: 85%

“…Our observations were consistent with the previous studies with similar focuses. For example, the separation flux of membranes with different pore sizes was reported at a range between 250 and 4300 L·m −2 ·h −1 [ 15 , 41 ]. We need to point out that the data obtained from a single moment may not accurately describe the flux change in the separation process.…”

Section: Resultsmentioning

confidence: 99%

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Wettability Improvement in Oil–Water Separation by Nano-Pillar ZnO Texturing

et al. 2022

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The nanostructure-based surface texturing can be used to improve the materials wettability. Regarding oil–water separation, designing a surface with special wettability is as an important approach to improve the separation efficiency. Herein, a ZnO nanostructure was prepared by a two-step process for sol–gel process and crystal growth from the liquid phase to achieve both a superhydrophobicity in oil and a superoleophobic property in water. It is found that the filter material with nanostructures presented an excellent wettability. ZnO-coated stainless-steel metal fiber felt had a static underwater oil contact angle of 151.4° ± 0.8° and an underoil water contact angle of 152.7° ± 0.6°. Furthermore, to achieve water/oil separation, the emulsified impurities in both water-in-oil and oil-in-water emulsion were effectively intercepted. Our filter materials with a small pore (~5 μm diameter) could separate diverse water-in-oil and oil-in-water emulsions with a high efficiency (>98%). Finally, the efficacy of filtering quantity on separation performance was also investigated. Our preliminary results showed that the filtration flux decreased with the collection of emulsified impurities. However, the filtration flux could restore after cleaning and drying, suggesting the recyclable nature of our method. Our nanostructured filter material is a promising candidate for both water-in-oil and oil-in-water separation in industry.

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Section: Resultssupporting

confidence: 85%

Section: Resultsmentioning

confidence: 99%

Wettability Improvement in Oil–Water Separation by Nano-Pillar ZnO Texturing

et al. 2022

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“…In general, the smaller values of R a and R q are indicative of the lower the roughness of the tested surface and the flatter the membrane surface. [ 45,46 ] Consistent with what was concluded from the SEM images, the surface of the pristine AEM was found flat and smooth, with a low roughness (R a = 6.37 nm; R q = 9.03 nm). After modifying with PDA, the surface roughness and the roughness value became higher (R a = 15.60 nm, R q = 19.50 nm) due to the uneven self‐aggregation.…”

Section: Results and Analysissupporting

confidence: 84%

Imparting Antimicrobial and Antifouling Properties to Anion Exchange Membrane through the Modification with Gentamicin‐Based Polymer

Luo

Yao

Liao

et al. 2021

Adv Materials Inter

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A series of gentamicin‐modified anion exchange membranes (AEMs) immobilized by mussel‐inspired dopamine coating is prepared in this work. The purpose is to improve antibacterial activity and fouling resistance of the commercial AEMs (AEM Type I, Fujifilm Co.). As a result of the applied modification, the hydrophilicity of membrane surface improved significantly. Thus, the as‐prepared modified AEMs exhibit the good antifouling property, in electrodialysis (ED) experiments by using the sodium dodecylbenzenesulfonate and albumin from bovine serum as model foulants. Furthermore, taking into account the results of the antibacterial test, the resulting modified AEMs exhibit improved antibacterial property for Escherichia coli (E. coli) and Staphylococcus aureus (S. aureus). After a brief contact with bacteria, the antibacterial rates of modified AEMs coating with gentamicin‐based polymer are 80.11% for E. coli and 90.66% for S. aureus, which are much higher than pristine AEM (6.28% and 9.07%), respectively. In addition, the modified membrane has good operational stability during ED process and recovery ability after contamination, and also maintains satisfactory electrochemical properties. This investigation highlights a design of simple strategy for the preparation of antimicrobial and antifouling AEM, which can be used for ED.

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“…Different thin film fabrication methods such as spin coating 1 , sol–gel 2 , spray pyrolysis 3 , electro deposition 4 , chemical bath deposition 5 , magnetron sputtering 6 and successive ion layer adsorption reaction (SILAR) 7 etc. have been applied to produce zinc oxide (ZnO) layers.…”

Section: Introductionmentioning

confidence: 99%

Effect of thickness and reaction media on properties of ZnO thin films by SILAR

Yergaliuly

Soltabayev

Kalybekkyzy

et al. 2022

Sci Rep

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Zinc oxide (ZnO) is one of the most promising metal oxide semiconductor materials, particularly for optical and gas sensing applications. The influence of thickness and solvent on various features of ZnO thin films deposited at ambient temperature and barometric pressure by the sequential ionic layer adsorption and reaction method (SILAR) was carefully studied in this work. Ethanol and distilled water (DW) were alternatively used as a solvent for preparation of ZnO precursor solution. Superficial morphology, crystallite structure, optical and electrical characteristics of the thin films of various thickness are examined applying X-ray diffraction (XRD) system, scanning electron microscopy, the atomic force microscopy, X-ray photoelectron spectroscopy, ultraviolet–visible spectroscopy, photoluminescence spectroscopy, Hall effect measurement analysis and UV response study. XRD analysis confirmed that thin films fabricated using ethanol or DW precursor solvents are hexagonal wurtzite ZnO with a preferred growth orientation (002). Furthermore, it was found that thin films made using ethanol are as highly crystalline as thin films made using DW. ZnO thin films prepared using aqueous solutions possess high optical band gaps. However, films prepared with ethanol solvent have low resistivity (10–2 Ω cm) and high electron mobility (750 cm2/Vs). The ethanol solvent-based SILAR method opens opportunities to synthase high quality ZnO thin films for various potential applications.

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Fabrication of zinc oxide nanostructure coated membranes for efficient oil/water separation

Cited by 86 publications

References 58 publications

Wettability Improvement in Oil–Water Separation by Nano-Pillar ZnO Texturing

Wettability Improvement in Oil–Water Separation by Nano-Pillar ZnO Texturing

Imparting Antimicrobial and Antifouling Properties to Anion Exchange Membrane through the Modification with Gentamicin‐Based Polymer

Effect of thickness and reaction media on properties of ZnO thin films by SILAR

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