Facile fabrication of TiO2-functionalized material with tunable superwettability for continuous and controllable oil/water separation, emulsified oil purification, and hazardous organics photodegradation

Qu, Mengnan; Liu, Qian; Yuan, Songbai; Yang, Chen; Li, Jiehui; Liu, Lulu; Peng, Lei; He, Jinmei

doi:10.1016/j.colsurfa.2020.125942

Cited by 14 publications

(8 citation statements)

References 49 publications

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“…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%

“…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. 35,67 The photo-stimulated electron can successively reunify with the hole and deplete the overall efficacy of the photodegradation mechanism. 34,48 However, the charge carrier which is able to avoid the charge-annihilation process migrates to the surface.…”

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: Results and Discussionmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

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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“…The synergistic effect of these factors contributes to the remarkable selfcleaning performance of T4. 38 Overall, the composite membrane showed excellent oil adsorption capacity (around 100 g/g) for Tween 80, Span 80, and silicone oil and between 30 g/g and 50 g/g for n-hexane. With the increase of TiO 2 nanoparticles doping, the oil adsorption capacity from T2 to T5 first increased and then decreased, and at T4, excellent oil adsorption capacity was observed for most kinds of oils.…”

Section: Self-cleaningmentioning

confidence: 89%

Preparation of superhydrophobic membranes with ultraviolet‐absorbing capacity for oil–water separation by electrospinning

Wang,

2024

Polymer Engineering & Sci

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To address the escalating issue of oily wastewater, separation membranes with special wettability on the surface are widely used in oil–water separation. The development of separation membranes with not only stable separation flux but also anti‐fouling properties is an urgent problem. Therefore, polystyrene/polyacrylonitrile‐polyvinylidene fluoride/polydimethylsiloxane‐titanium dioxide nanoparticle (PS/PAN‐PVDF/PDMS@TiO2) composite membranes with superhydrophobicity and lipophilicity were prepared by electrospinning technique. By changing the doping amount of TiO2 nanoparticles, the multilevel rough structure was constructed on the surface, and the transformation of the Ti–O–C chemical bond to the Si–O–Ti chemical bond was realized inside the composite membrane. The results showed that the composite membrane had excellent superhydrophobicity (154.9°) and mechanical properties (tensile strength of 3.54 MPa, elongation of 60.95%). The membrane can absorb ultraviolet light and exhibits enhanced resistance to fouling when exposed to visible‐UV light. Additionally, the composite membrane demonstrates an adsorption capacity of 30–100 g/g for a wide range of oils. In corrosive environments, the composite membrane maintains superhydrophobicity (above 150°) and achieves high oil–water separation efficiency (97%). After 40 cycles, the separation flux of 6000 L.h−1 m−2 can be maintained. Hence, superhydrophobic oleophilic composite membranes with a stable separation flux and resistance to fouling can be employed in the field of oil–water separation.Highlights PS/PAN‐PVDF/PDMS@TiO2 composite membrane with multilevel rough structure. PS/PAN‐PVDF/PDMS@TiO2 composite membrane with excellent UV absorption and self‐cleaning ability. PS/PAN‐PVDF/PDMS@TiO2 composite membrane with stable oil–water separation efficiency in harsh environments.

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“…Surface modification with organic agents minimizes the surface energy, stabilizes the metal oxide nanoparticles and make them suitable for various applications. Different metal oxide nanoparticles (e. g. SiO 2 , Fe 3 O 4 , Al 2 O 3 , CuO, TiO 2 , and Fe 2 O 3 ) have been surface modified with reagents such as silanes, [19] terephthalic acid, [20] stearic acid, [21,22] thiols, [23] polyethylene glycol bisamine [24] and EDTA. [25] The surface modified metal oxide nanoparticles have been explored for diverse applications (e. g. detection and removal of toxic metal ions, photodegradation, lubrication, and oil-water separation).…”

Section: Introductionmentioning

confidence: 99%

Surface Modification of ZnO Nanorods using Stearic Acid and their Self‐cleaning and Photocatalytic Applications

Narwal,

Jeevanandam

2023

ChemistrySelect

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In the current study, a cost‐effective simple strategy has been developed for the surface modification of ZnO nanorods (NRs). The ZnO NRs were surface modified using stearic acid. The ZnO NRs and stearic modified ZnO NRs were characterized using various analytical techniques. FT‐IR, TGA, and CHO analyses prove successful surface modification of ZnO NRs with stearic acid. FE‐SEM and TEM analyses show no change in morphology of ZnO NRs before and after the surface modification. The stearic acid modified ZnO NRs show water contact angle greater than 90° which suggests their hydrophobic nature. XPS analysis shows presence of Zn2+ and O2− in pure ZnO and the stearic acid modified ZnO NRs. The stearic acid modified ZnO NRs were explored for self‐cleaning and they were also tested as catalyst for photocatalytic degradation of crystal violet in an aqueous solution. Kinetics and recyclability studies were also carried out for the photodegradation of crystal violet using the stearic acid modified ZnO NRs.

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Facile fabrication of TiO2-functionalized material with tunable superwettability for continuous and controllable oil/water separation, emulsified oil purification, and hazardous organics photodegradation

Cited by 14 publications

References 49 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

Preparation of superhydrophobic membranes with ultraviolet‐absorbing capacity for oil–water separation by electrospinning

Surface Modification of ZnO Nanorods using Stearic Acid and their Self‐cleaning and Photocatalytic Applications

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Facile fabrication of TiO2-functionalized material with tunable superwettability for continuous and controllable oil/water separation, emulsified oil purification, and hazardous organics photodegradation

Cited by 14 publications

References 49 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

Preparation of superhydrophobic membranes with ultraviolet‐absorbing capacity for oil–water separation by electrospinning

Surface Modification of ZnO Nanorods using Stearic Acid and their Self‐cleaning and Photocatalytic Applications

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Product

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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