Robust PAAm-TA hydrogel coated PVDF membranes with excellent crude-oil antifouling ability for sustainable emulsion separation

Jiang, Yuxie; Xian, Caiyun; Xu, Xuanfei; Zheng, Weiwei; Zhu, Tianxue; Cai, Weilong; Huang, Jianying; Lai, Yuekun

doi:10.1016/j.memsci.2022.121166

Cited by 43 publications

(10 citation statements)

References 48 publications

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“…In addition, the oil contents analyzed by TOC in the corresponding filtrate were 14.8, 54.6, 59.4, 22.5, and 11.9 ppm, respectively, referring to the oil separation efficiencies of 99.8, 99.4, 99.1, 99.7, and 99.8% for different emulsions (Supporting Information Table S1). As comparisons, other reported membranes prepared by either catechol-contained chemicals, commercial zwitterionic polymers, or iron-based materials are provided in Figure d and Supporting Information Table S2, demonstrating that the as-prepared M3 has a considerably high water flux and separation efficiency. ,,− …”

Section: Results and Discussionmentioning

confidence: 90%

Robust Zwitterionic Poly(imidazolium)-Coated PVDF Membrane for Oily Water Treatment with Antibacterial and Anti-Biofouling Performances

Ning

Xing

et al. 2023

Ind. Eng. Chem. Res.

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Membrane fouling remains a major challenge during oily wastewater purification, resulting in reduced water flux and separation efficiency. Zwitterionic polymers have been introduced to the PVDF membrane and shown their fouling resistance ability. However, most current zwitterions lack bactericidal effects and tend to be fouled by the attachment of bacteria and biofilm formation in long-term service. Herein, a synthetic zwitterionic poly(imidazolium), poly(ZIM-co-VTS), was introduced onto the PVDF membrane by co-assembly with polydopamine (PDA) and tetraethyl orthosilicate (TEOS) as a silica source. The in situ covalent bond can be formed between the catechol from PDA and silanol groups from both TEOS and imidazole-based polymers. Further, Fe3+ cross-linking contributes to the robust chemical stability of modified PVDF. The as-prepared coating exhibits superhydrophilicity and underwater superoleophobicity under harsh conditions (pH = 1 and 13), remaining high separation efficiency (>99%) toward various surfactant-stabilized oil-in-water emulsions without an apparent water flux (>1013 L m–2 h–1 bar–1) decline. More importantly, the cationic imidazolium in poly(ZIM-co-VTS) endues the excellent bacterial killing efficiency toward Staphylococcus aureus (4.5 log10 reduction) and Escherichia coli (4.7 log10 reduction). The zwitterionic poly(imidazolium)-modified PVDF exhibited long-term durability with anti-biofouling properties and was a promising candidate for practical oily wastewater remediation.

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Section: Results and Discussionmentioning

confidence: 90%

Robust Zwitterionic Poly(imidazolium)-Coated PVDF Membrane for Oily Water Treatment with Antibacterial and Anti-Biofouling Performances

Ning

Xing

et al. 2023

Ind. Eng. Chem. Res.

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“…S3), and its OCA reaches 151° under water. The ANF modified wood exhibiting an underwater OCA of up to 157° displays stable underwater superoleophobicity, mainly depending on the effect of highly porous structure of polymeric layer on the wetting behavior of underwater oil droplets (Jiang et al 2023) (Fig. S4).…”

Section: Resultsmentioning

confidence: 99%

Easy preparation of wood-base membrane with fouling resistance in complex environments for efficient oil-water emulsion separation

Zhang

Teng

Zhai

et al. 2023

Preprint

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Oily wastewater poses a serious threat to the ecological environment and human health, and there is a great deal of concern about how to treat it effectively. Although there has been considerable development in recent years in the treatment of oil-water emulsions using separation membranes with special wettability, they still suffer from real problems such as complex preparation processes, material contamination, so developing an economical and environmentally friendly, high-performance membrane is a significant challenge. In this work, a wood-based membrane was easily prepared by a simple dipping process using aramid nanofiber (ANF) to modify the surface of wood. The wet ANF/wood membrane reveals higher tensile strength (1.69±0.32 MPa) than synthetic hydrogel membranes. More importantly, the membrane presents the underwater superoleophobic properties and fouling resistance under complex environmental conditions (acid, alkali, seawater, and high temperature), and effectively separate various oil-water emulsions with high separation efficiency (>99.3%) and flux (>227 L m-2 h-1). More excitingly, the membrane remains the original separation properties after 13 cycles of oil-water emulsion separation, Therefore, the inexpensive, environmentally friendly and easily prepared ANF/wood membrane is well tolerated under extreme conditions, presents excellent separation performances and provides a material basis for the treatment of actual oily wastewater.

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“…Wettability in oil/water systems for dual superlyophobic SSM after immersing the SSM in aqueous solutions with water pH varying from 2 to 12 for 24 h has also been evaluated. The SSMs are still superhydrophobic even with the pH of water drops varying from 2 to 12 when the SSMs were prewetted by oils (data not shown); however, the SSMs were broken once they were immersed in strong acidic water (data not shown here), which is ascribed to the unstable coordination between Zn 2+ and Im under acidic conditions . Wettability after being submerged in water for 24 h with different pH values was chosen to determine chemical stability in this work.…”

Section: Resultsmentioning

confidence: 99%

“…The SSMs are still superhydrophobic even with the pH of water drops varying from 2 to 12 when the SSMs were prewetted by oils (data not shown); however, the SSMs were broken once they were immersed in strong acidic water (data not shown here), which is ascribed to the unstable coordination between Zn 2+ and Im under acidic conditions. 26 Wettability after being submerged in water for 24 h with different pH values was chosen to determine chemical stability in this work. Therefore, the SSMs can be superoleophobic when they were immersed in the water phase with pH = 7−12 and are base stable.…”

Section: Surface Wettabilitymentioning

confidence: 99%

Dual Superlyophobic Materials for Under-Liquid Microfluid Manipulation, Immiscible Solvent Separation, and CO₂ Blockage

Luo

Liu

et al. 2023

ACS Appl. Mater. Interfaces

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Oily water purification, immiscible solvent separation, sensitive microreaction, and CO2 blockage are of great interest because of their importance for the environment and demands of controllable microreactions. However, one specific material that can meet all the requirements has yet to be reported. Herein, we developed a simple environment-benign method to prepare specific dual superlyophobic materials to solve the problems mentioned earlier. The dual superlyophobic materials can maintain their dual superoleophobicity in various oil/water systems, and no additional surface modifications were required when the oil/water system was changed. Moreover, the materials can be used to separate oil/water mixtures with separation efficiencies greater than 99.50% even after 40 separation cycles and separate immiscible organic solvents with efficiencies over than 99.25% after 20 cycles. Separations of meal waste oily water at 60 °C and crude oil/water were also successfully performed. The materials can be further applied to manipulate and block CO2 bubbles under liquid. The materials can also act as a platform for microdrop manipulation/microreaction under liquid.

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Robust PAAm-TA hydrogel coated PVDF membranes with excellent crude-oil antifouling ability for sustainable emulsion separation

Cited by 43 publications

References 48 publications

Robust Zwitterionic Poly(imidazolium)-Coated PVDF Membrane for Oily Water Treatment with Antibacterial and Anti-Biofouling Performances

Robust Zwitterionic Poly(imidazolium)-Coated PVDF Membrane for Oily Water Treatment with Antibacterial and Anti-Biofouling Performances

Easy preparation of wood-base membrane with fouling resistance in complex environments for efficient oil-water emulsion separation

Dual Superlyophobic Materials for Under-Liquid Microfluid Manipulation, Immiscible Solvent Separation, and CO₂ Blockage

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Robust PAAm-TA hydrogel coated PVDF membranes with excellent crude-oil antifouling ability for sustainable emulsion separation

Cited by 43 publications

References 48 publications

Robust Zwitterionic Poly(imidazolium)-Coated PVDF Membrane for Oily Water Treatment with Antibacterial and Anti-Biofouling Performances

Robust Zwitterionic Poly(imidazolium)-Coated PVDF Membrane for Oily Water Treatment with Antibacterial and Anti-Biofouling Performances

Easy preparation of wood-base membrane with fouling resistance in complex environments for efficient oil-water emulsion separation

Dual Superlyophobic Materials for Under-Liquid Microfluid Manipulation, Immiscible Solvent Separation, and CO2 Blockage

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Product

Resources

About

Dual Superlyophobic Materials for Under-Liquid Microfluid Manipulation, Immiscible Solvent Separation, and CO₂ Blockage