Crosslinked PVDF‐HFP‐based hydrophobic membranes incorporated with CNF for enhanced stability and permeability in membrane distillation

Ray, Saikat Sinha; Deb, Chinmoy Kanti; Chang, Hau‐Ming; Ganesapillai, Mahesh

doi:10.1002/app.48021

Cited by 18 publications

(4 citation statements)

References 36 publications

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“…Remarkably, MD operations also have a higher rejection of micro-pollutants when compared with both nanofiltration (NF) and reverse osmosis (RO) processes [ 12 ]. Although MD operations can be energy-efficient and have a higher rejection percentage, membrane fouling and wetting are major concerns affecting the efficiency of the process [ 13 , 14 ]. Extensive research on the modification of polymeric membranes by the incorporation of nanoparticles (NPs) is being conducted in order to mitigate these concerns.…”

Section: Introductionmentioning

confidence: 99%

Recent Developments in Nanomaterials-Modified Membranes for Improved Membrane Distillation Performance

et al. 2020

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Membrane distillation (MD) is a thermally induced membrane separation process that utilizes vapor pressure variance to permeate the more volatile constituent, typically water as vapor, across a hydrophobic membrane and rejects the less volatile components of the feed. Permeate flux decline, membrane fouling, and wetting are some serious challenges faced in MD operations. Thus, in recent years, various studies have been carried out on the modification of these MD membranes by incorporating nanomaterials to overcome these challenges and significantly improve the performance of these membranes. This review provides a comprehensive evaluation of the incorporation of new generation nanomaterials such as quantum dots, metalloids and metal oxide-based nanoparticles, metal organic frameworks (MOFs), and carbon-based nanomaterials in the MD membrane. The desired characteristics of the membrane for MD operations, such as a higher liquid entry pressure (LEPw), permeability, porosity, hydrophobicity, chemical stability, thermal conductivity, and mechanical strength, have been thoroughly discussed. Additionally, methodologies adopted for the incorporation of nanomaterials in these membranes, including surface grafting, plasma polymerization, interfacial polymerization, dip coating, and the efficacy of these modified membranes in various MD operations along with their applications are addressed. Further, the current challenges in modifying MD membranes using nanomaterials along with prominent future aspects have been systematically elaborated.

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Section: Introductionmentioning

confidence: 99%

Recent Developments in Nanomaterials-Modified Membranes for Improved Membrane Distillation Performance

et al. 2020

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“…As shown in Figure 3b, there are no cracks or peeling on the coating even after being immersed in water for 6 months. Such good water-proof capability originates from the hydrophobicity of P(VdF-HFP) [39] and SBR. [40] When exposed outdoors for 3 months, the coating appears the same as the pristine state without any cracks (Figure S10, Supporting Information).…”

Section: Resultsmentioning

confidence: 99%

Scalable Aqueous Processing‐Based Passive Daytime Radiative Cooling Coatings

Huang

Chen

Luo

et al. 2021

Adv Funct Materials

117

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Passive daytime radiative cooling (PDRC) can realize electricity‐free cooling by reflecting sunlight and emitting heat to the cold space. Current PDRC designs often involve costly vacuum processing or a large quantity of harmful organic solvents. Aqueous and paint‐like processing is cost‐effective and environmentally benign, thereby highly attractive for green manufacturing of PDRC coatings. However, common polymers explored in PDRC are difficult to disperse in water, let alone forming porous structures for efficient cooling. Here, a simple “bottom‐up” ball milling approach to create uniform microassembly of poly(vinylidene fluoride‐co‐hexafluoropropene) nanoparticles is reported. The micro‐ and nanopores among secondary particles and primary particles substantially enhance light scattering and results in excellent PDRC performance. A high solar reflectance of 0.94 and high emittance of 0.97 are achieved, making the coating 3.3 and 1.7 °C cooler than commercial white paints and the ambient temperature, under a high solar flux of ≈1100 W m−2. More importantly, the volatile organic compound content in the aqueous paint is only 71 g L−1. This satisfies the general regulatory requirements, which are critical to sustainability and practical applications.

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“…However, they have a low piezoelectric voltage constant so that they need a high electric field for polarization, making polarization more difficult. Studies [108] were reported on the P(VDF-co-HFP) blended with other polymers such as poly(methyl methacrylate) (PMMA), PVC, poly(vinyl acetate) (PVAc) for electrolytes applications. The preparation of the composite P(VDF-co-HFP) membranes grafted by cross-linked collagen was also reported.…”

Section: Pvdf and Its Copolymer Membranesmentioning

confidence: 99%

Fluoropolymer Membranes for Membrane Distillation and Membrane Crystallization

Macedonio²,

Ursino³

et al. 2022

Polymers

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Fluoropolymer membranes are applied in membrane operations such as membrane distillation and membrane crystallization where hydrophobic porous membranes act as a physical barrier separating two phases. Due to their hydrophobic nature, only gaseous molecules are allowed to pass through the membrane and are collected on the permeate side, while the aqueous solution cannot penetrate. However, these two processes suffer problems such as membrane wetting, fouling or scaling. Membrane wetting is a common and undesired phenomenon, which is caused by the loss of hydrophobicity of the porous membrane employed. This greatly affects the mass transfer efficiency and separation efficiency. Simultaneously, membrane fouling occurs, along with membrane wetting and scaling, which greatly reduces the lifespan of the membranes. Therefore, strategies to improve the hydrophobicity of membranes have been widely investigated by researchers. In this direction, hydrophobic fluoropolymer membrane materials are employed more and more for membrane distillation and membrane crystallization thanks to their high chemical and thermal resistance. This paper summarizes different preparation methods of these fluoropolymer membrane, such as non-solvent-induced phase separation (NIPS), thermally-induced phase separation (TIPS), vapor-induced phase separation (VIPS), etc. Hydrophobic modification methods, including surface coating, surface grafting and blending, etc., are also introduced. Moreover, the research advances on the application of less toxic solvents for preparing these membranes are herein reviewed. This review aims to provide guidance to researchers for their future membrane development in membrane distillation and membrane crystallization, using fluoropolymer materials.

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Crosslinked PVDF‐HFP‐based hydrophobic membranes incorporated with CNF for enhanced stability and permeability in membrane distillation

Cited by 18 publications

References 36 publications

Recent Developments in Nanomaterials-Modified Membranes for Improved Membrane Distillation Performance

Recent Developments in Nanomaterials-Modified Membranes for Improved Membrane Distillation Performance

Scalable Aqueous Processing‐Based Passive Daytime Radiative Cooling Coatings

Fluoropolymer Membranes for Membrane Distillation and Membrane Crystallization

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