A modified mussel-inspired method to fabricate TiO2 decorated superhydrophilic PVDF membrane for oil/water separation

Shi, Heng; He, Yi; Yang, Piaoping; Di, Haihui; Zhang, Lei; Zhang, Chunli

doi:10.1016/j.memsci.2016.01.053

Cited by 433 publications

(129 citation statements)

References 38 publications

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“…This mechanism, namely the hydration force, has been a pivotal guiding principle for developing fouling resistant membranes and antioil-adhesion surfaces [39,40]. Although the effect of hydration force is indeed prominent, there is another important factor that plays a critical role in oil-membrane interaction but is nonetheless often neglected in developing underwater oelophobic surfaces [28,[41][42][43]. This factor is surface charge, which plays a significant role in controlling both electrical double layer (EDL) interaction and interfacial tension [44,45].…”

Section: Introductionmentioning

confidence: 99%

Tailoring surface charge and wetting property for robust oil-fouling mitigation in membrane distillation

Wang

Jin

Hou

et al. 2016

Journal of Membrane Science

127

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a b s t r a c tThe efforts of developing anti-oil-fouling membranes have so far been focusing on tailoring membrane surface wetting properties, whereas the impacts of surface charge are often eclipsed. In this study, we investigated the impacts of surface charge and wetting property on oil fouling kinetics in membrane distillation (MD). Two composite membranes with in-air hydrophilic and underwater oleophobic surfaces, one of positive charge and the other of negative charge, were fabricated by modifying a hydrophobic polyvinylidene fluoride (PVDF) membrane with hydrophilic polyelectrolytes with different charges. The modified composite membranes were compared with the reference PVDF membrane for their contact angles, adhesion force curves, and fouling kinetics in MD processes. It was found that the negatively charged composite membrane performed the best in mitigating fouling by the negatively charged oil emulsion, followed by the positively charged composite membrane, with the pristine PVDF membrane being the most susceptible to oil fouling in MD experiments. The results from underwater oil CA measurements and oil probe force spectroscopy corroborated the results in the fouling experiments. The impact of surface charges on oil-membrane interaction and associated mechanism were also discussed.

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Section: Introductionmentioning

confidence: 99%

Tailoring surface charge and wetting property for robust oil-fouling mitigation in membrane distillation

Wang

Jin

Hou

et al. 2016

Journal of Membrane Science

127

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“…Literature reports suggest that DA can undergo self‐polymerization to give polydopamine ability and thus makes DA can adhere to almost all types of substrates for surface modification irrespective of their chemical composition or morphology characteristics. Recently, Shi et al reported one‐step facile method to directly adhere TiO 2 nanoparticles on PVDF membrane surface with DA using the bio‐inspired methods, which resulted in introduction of superhydrophilicity and underwater superoleophobicity on inherently hydrophobic membranes.…”

Section: Introductionmentioning

confidence: 99%

Mussel‐inspired method to decorate commercial nanofiltration membrane for heavy metal ions removal

Liu

Feng

Zhang

et al. 2020

Polymers for Advanced Techs

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Nanofiltration (NF) membranes have been widely used for the treatment of electroplating, aerospace, textile, pharmaceutical, and other chemical industries. In this work, halloysite nanotubes (HNTs) were directly anchored on the surface of commercial nanofiltration (NF) membrane by dopamine modification following advantageous bio‐inspired methods. SEM and AFM images were used to characterize the HNTs decorated membrane surface in terms of surface morphology and roughness. Water contact angle (WCA) was employed in evidencing the incorporation of HNTs and dopamine in terms of hydrophilicity or hydrophobicity. Augmentation of HNTs was found to obviously enhance the hydrophilicity and surface roughness resulting in improved water permeability of membrane. More importantly, the rejection ratios of membrane also increased during the removal of heavy metal ions from wastewater. The permeability and Cu2+ rejection ratio of modified NF membrane were as high as 13.9 L·m−2·h−1·bar−1 and 74.3%, respectively. Incorporation of HNTs was also found to enhance the anti‐fouling property and stability of membrane as evident from long‐term performance tests. The relative concentration of HNTs and dopamine on membrane surface was optimized by investigating the trade‐off between water permeability and rejection ratio.

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“…For self‐assembly membrane, stability is another key factor, which is considered to be the prerequisite for membrane separation applications. Amussel‐inspired bioglue, dopamine, with amusing structures and distinctive properties, could self‐polymerize and adhere onto virtually any type of material surface, regardless of the material's properties . In addition, polydopamine (PDA) coatings possess extremely hydrophilic surface and effectively absorb dye ability owing to various functional groups such as amino, imino, and phenolic hydroxyl .…”

Section: Introductionmentioning

confidence: 99%

Preparation of stable and superior flux GO/LDH/PDA‐based nanofiltration membranes through electrostatic self‐assembly for dye purification

Zhong

Wang

et al. 2019

Polymers for Advanced Techs

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Graphene oxide (GO) has triggered significant attention as a new type of self‐assembly membrane material. However, the low filtration flux and unstable performance of GO membrane limit its practical application. Hence, in this work, layered double hydroxides (LDHs), as a 2D material with double‐layer channel structure and positive electricity, were self‐assembled with GO at weight ratio of 7:3 by electrostatic interaction. Then, the GO/LDH hybrids combined with polydopamine (PDA) to obtain stable and high‐flux GO‐based membranes through vacuum filtration and the structure and morphology of as‐prepared samples were characterized by FT‐IR, XRD, XPS, and SEM. Furthermore, the separation performance and surface electronegativity of membranes were tested via pure water flux, rejection efficiency, recycle experiments, and zeta potential. Results revealed that the stability and flux of composite membrane were enhanced significantly compared with neat GO‐based membrane. Further, the dye rejection rate of methylene blue (MB) is higher than Congo red (CR) and rhodamine B (Rh B) and reached to 99.8%.

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A modified mussel-inspired method to fabricate TiO2 decorated superhydrophilic PVDF membrane for oil/water separation

Cited by 433 publications

References 38 publications

Tailoring surface charge and wetting property for robust oil-fouling mitigation in membrane distillation

Tailoring surface charge and wetting property for robust oil-fouling mitigation in membrane distillation

Mussel‐inspired method to decorate commercial nanofiltration membrane for heavy metal ions removal

Preparation of stable and superior flux GO/LDH/PDA‐based nanofiltration membranes through electrostatic self‐assembly for dye purification

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