Stable hydrophilic and underwater superoleophobic ZnO nanorod decorated nanofibrous membrane and its application in wastewater treatment

Ahmed, Fayez U.; Upadhaya, Diliraj; Purkayastha, Debarun Dhar; Krishna, M. Ghanashyam

doi:10.1016/j.memsci.2022.120803

Cited by 46 publications

(36 citation statements)

References 57 publications

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“…47 The transmittance band of β-phase dominates in the NF TiO 2 @PVDF membrane, just as it does in the virgin NF PVDF membrane. The characteristic transmittance bands, attributed to the β-phase are clearly identified at 840 cm −1 (CH 2 rocking), 47 875 cm −1 (C−C skeletal rocking vibration), 48 1072 and 1400 cm −1 (wagging of CH 2 ), 1168 cm −1 (stretching vibration of CF 2 ), 48 and 1275 cm −1 (CF 2 asymmetric stretching). 49 Meanwhile, the twisting and wagging vibration of CF 2 and CH 2 in the PVDF chain is accountable for the α-phase characteristic band positioned at 614 and 763 cm −1 .…”

Section: Resultsmentioning

confidence: 96%

“…The schematic of photoinduced hydrophilicity and the degradation of organic and pharmaceutical pollutants are shown in Figure g. In the existence of sufficient photon energy, an electron is stimulated from the valance band (VB) of TiO 2 nanostructure to the conduction band, creating a hole in the VB. , The photo-stimulated electron can successively reunify with the hole and deplete the overall efficacy of the photodegradation mechanism. , However, the charge carrier which is able to avoid the charge-annihilation process migrates to the surface. The photo-excited surface electrons can reduce the available oxygen to create normalO 2 − * . , The VB hole can also oxidize surface adsorbed H 2 O or OH – and produce*OH.…”

Section: Results and Discussionmentioning

confidence: 99%

“…The photo-excited surface electrons can reduce the available oxygen to create * O 2 . 48,63 The VB hole can also oxidize surface adsorbed H 2 O or OH − and produce*OH. These reactive oxygen species can convert the pollutants into CO 2 and H 2 O.…”

Section: Resultsmentioning

confidence: 99%

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Decoration of Cauliflower-Like TiO₂ on Nanofibrous PVDF Membranes: A Strategy for Wastewater Treatment

Ahmed

Purkayastha

2023

ACS Appl. Polym. Mater.

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Water resources have been significantly affected by the growth of the modern industry as well as regular marine oil spills, which has led people to develop cutting-edge technology or materials for the treatment of oily wastewater. Herein, we successfully decorated the surface of the electrospun nanofibrous (NF) PVDF membrane with a photocatalytic TiO2 nano cauliflower-like structure with a facile, cost-effective hydrothermal approach. Taking advantage of the surface’s micro/nano structure, the NF TiO2@PVDF nano cauliflower-like membrane shows magnificent surface wettability, photocatalytic degradability, and robustness. It can separate both water-in-oil mixture and surfactant-stabilized water-in-oil emulsions with a high degree of separation efficiency because of the wetting behavior of the membrane. Moreover, taking advantage of the photocatalytic nature of the TiO2, the resultant NF TiO2@PVDF nano cauliflower-like membrane can also be used in degrading pharmaceutical and organic pollutants to address wastewater treatment. Given the distinctive supremacy of the aforementioned modified NF PVDF membrane, the technique can encourage the widespread development of multifunctional superwetting materials presenting an appealing potential for complex oily wastewater treatment.

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Section: Resultsmentioning

confidence: 96%

Section: Results and Discussionmentioning

confidence: 99%

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Decoration of Cauliflower-Like TiO₂ on Nanofibrous PVDF Membranes: A Strategy for Wastewater Treatment

Ahmed

Purkayastha

2023

ACS Appl. Polym. Mater.

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“…Unfortunately, it is an enormous trouble for conventional separation techniques to separate smaller size stabilized emulsified oil (oil droplets <20 μm) due to high energy cost and complex manual operation. , Over the past decades, it has been demonstrated that membrane filtration is a simply operated, no secondary pollution, and low-energy separation approach for oily wastewater treatment. , However, membrane fouling has always been an obstacle for limiting the development of efficient oily wastewater treatment . During the separation process, the deposition or adsorption of emulsified oils usually caused rapid decline of the permeation flux of membranes. − Although many works reported the improvement of the anti-fouling performance of membranes, the great anti-fouling property for the high-viscosity crude oil has been little studied. Therefore, fabricating the separation membranes with excellent resistance to high viscosity crude oil adhesion is urgent.…”

Section: Introductionmentioning

confidence: 99%

Self-Assembled CMC/UiO-66-NH₂ Membrane with Anti-Crude Oil Adhesion Property for Highly Efficient Oil–Water Separation

Wan

Wang

et al. 2022

Langmuir

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Developing the high-anti-fouling membrane has kept continuous attention in oil/water emulsion treatment. However, the majority of works on anti-fouling membranes mainly focused on low-viscosity oils, which greatly limited the development and application of a membrane to face the real crude oil wastewater. Inspired by the hydrophilicity of sodium carboxymethyl cellulose (CMC) and zirconium base metal–organic frame (Zr-MOF), an anti-oil-fouling CMC/UiO-66-NH2 composite membrane was constructed by a self-assembly method. Profiting from the hydrophilicity and micro-nanostructure of the CMC/UiO-66-NH2 layer, the obtained CMC/UiO-66-NH2 membranes displayed underwater superoleophobicity and desired oil resistance. It could display the effective separation capability with 1282 ± 62 to 6160 ± 81 L/(m2·h·bar) and above 99.08% toward the different light oil emulsions. More importantly, the CMC/UiO-66-NH2 membrane displayed ultralow crude oil adhesion behaviors toward the crude oil emulsions, which could achieve a considerably high flux (746 ± 60 to 5224 ± 87 L/(m2·h·bar)). Furthermore, electrostatic interaction and physical enwinding–wrapping between CMC and UiO-66-NH2 also endowed the composite membranes with outstanding stability. After immersing the as-prepared membranes into the harsh environments for 24 h, the membranes still maintained high underwater–oil contact angles (UWOCA > 155°) and separation ability (oil rejection was above 99.0%). Therefore, CMC/UiO-66-NH2 composite membranes could demonstrate promising prospects in real oily emulsion treatment.

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“…Therefore, it can remove the adhesion of oil at high temperatures and can remain intact. These superhydrophilic/ superoleophobic inorganic fiber materials not only have good antifouling ability but also have good decontamination performance.Similarly, Ahmed et al122 used two steps to modify ZnO nanorods on PVDF nanofibrous membranes to create a multifunctional superhydrophilic/underwater superoleophobic PVDF@ZnO fibrous membrane with high throughput and emulsion separation efficiency. The membrane's underwater OCA can reach 162°.…”

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confidence: 99%

Bionic multifunctional fibrous materials for efficient oil/water separation

Guo

Liu

2023

Droplet

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Special wettability fibrous materials have received a lot of attention because of their good connectivity, mechanical flexibility, large specific surface area, and ease of shape manipulation. Their outstanding performance paves the way toward efficient oil/water separation in a variety of environments and for separation requirements. This paper discusses the distinct advantages, challenges, and future research directions of various substrates for fibrous materials, such as nonwoven natural biomass fibers, fabrics, electrospinning fibers, metallic fibers, and inorganic nonmetallic fibers. The special wettability fibrous filter materials and fibrous adsorbents are summarized based on the different separation methods.The principles of preparation of various special wettabilities are introduced, and the unique advantages of fibrous adsorbents are emphasized. The preparation strategy of fibrous filter materials is discussed, as well as some representative work and research progress. The benefits, drawbacks, and research directions in terms of various materials are examined. This article emphasizes the pollution resistance of fibrous filter materials and the elasticity of fibrous adsorbents. Finally, the prospects in terms of the problems, challenges, and future development of special wettability fibrous materials used in oil/water separation are discussed.

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Stable hydrophilic and underwater superoleophobic ZnO nanorod decorated nanofibrous membrane and its application in wastewater treatment

Cited by 46 publications

References 57 publications

Decoration of Cauliflower-Like TiO₂ on Nanofibrous PVDF Membranes: A Strategy for Wastewater Treatment

Decoration of Cauliflower-Like TiO₂ on Nanofibrous PVDF Membranes: A Strategy for Wastewater Treatment

Self-Assembled CMC/UiO-66-NH₂ Membrane with Anti-Crude Oil Adhesion Property for Highly Efficient Oil–Water Separation

Bionic multifunctional fibrous materials for efficient oil/water separation

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Stable hydrophilic and underwater superoleophobic ZnO nanorod decorated nanofibrous membrane and its application in wastewater treatment

Cited by 46 publications

References 57 publications

Decoration of Cauliflower-Like TiO2 on Nanofibrous PVDF Membranes: A Strategy for Wastewater Treatment

Decoration of Cauliflower-Like TiO2 on Nanofibrous PVDF Membranes: A Strategy for Wastewater Treatment

Self-Assembled CMC/UiO-66-NH2 Membrane with Anti-Crude Oil Adhesion Property for Highly Efficient Oil–Water Separation

Bionic multifunctional fibrous materials for efficient oil/water separation

Contact Info

Product

Resources

About

Decoration of Cauliflower-Like TiO₂ on Nanofibrous PVDF Membranes: A Strategy for Wastewater Treatment

Decoration of Cauliflower-Like TiO₂ on Nanofibrous PVDF Membranes: A Strategy for Wastewater Treatment

Self-Assembled CMC/UiO-66-NH₂ Membrane with Anti-Crude Oil Adhesion Property for Highly Efficient Oil–Water Separation