Fabrication of PVDF nanofibrous hydrophobic composite membranes reinforced with fabric substrates via electrospinning for membrane distillation desalination

Li, Kuiling; Hou, Deyin; Fu, Chaochen; Wang, Kai; Wang, Jun

doi:10.1016/j.jes.2018.04.002

Cited by 67 publications

(32 citation statements)

References 44 publications

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“…graphene) to the electrospun PVDF nanofibres, whereby the LEP of superhydrophobic membrane and pristine PVDF nanofibres were 130 ± 5 kPa and 66 ± 4 kPa, respectively . The LEP values reported in this study were comparable to other electrospun PVDF nanofibre membranes presented in the literature . Remarkably, these LEP values were lower than the recommended values (≥ 250 kPa) for MD application and thus require further optimization.…”

Section: Resultssupporting

confidence: 61%

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Enhanced flux in direct contact membrane distillation using superhydrophobic PVDF nanofibre membranes embedded with organically modified SiO₂ nanoparticles

Nthunya

Gutierrez

Verliefde

et al. 2019

J of Chemical Tech & Biotech

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BACKGOUND Membrane distillation (MD) is a promising low‐cost and efficient desalination process, yet it has not been fully implemented at an industrial scale. Membrane wetting and low porosity are limiting factors leading to low water recovery rates. The current study involved the synthesis of membranes that combined high mechanical stability, porosity and superhydrophobicity, to prevent wetting, with high salt rejection and water flux. RESULTS Silica nanoparticles (SiO2NPs) were synthesized by a novel green chemistry procedure, modified with three different silane reagents [octadecyltrimethoxysilane, N‐octadecyltrichlorosilane (ODTS) and chlorodimethyl‐octadecyl silane] and finally embedded on polyvinylidene fluoride (PVDF) nanofibre membranes using an in‐situ electrospinning technique. These modified membranes displayed a Young's modulus of ∼43 MPa and showed highly porous properties (∼80% porosity, 1.24–1.41 μm pore sizes) and superhydrophobic surfaces (contact angle >150o); thus possessing parameters falling within the range of highly recommended values in MD. Remarkably, the concentration of modified SiO2NPs used to produce the superhydrophobic PVDF nanofibre membranes was significantly lower (1% w/w) than those reported in the literature (3–4% w/w), clearly indicating the efficiency of these silane reagents. CONCLUSION Membranes embedded with ODTS‐modified SiO2NPs were the most efficient; rejecting salts at high efficiencies (>99.9%) with water fluxes of ≈34.2 LMH at 60 °C, thus indicating their capacity as an energy‐efficient process to produce high purity water. © 2019 Society of Chemical Industry

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Section: Resultssupporting

confidence: 61%

“…52 The LEP values reported in this study were comparable to other electrospun PVDF nanofibre membranes presented in the literature. 53,54 Remarkably, these LEP values were lower than the recommended values (≥ 250 kPa) for MD application 13,15,55 and thus require further optimization.…”

Section: Lep Measurementsmentioning

confidence: 82%

Enhanced flux in direct contact membrane distillation using superhydrophobic PVDF nanofibre membranes embedded with organically modified SiO₂ nanoparticles

Nthunya

Gutierrez

Verliefde

et al. 2019

J of Chemical Tech & Biotech

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“…Mechanical durability is one of the most challenging bottlenecks of the electrospun nanofibrous membranes. Li and coworkers [155] studied on improving the mechanical features of the nanofibrous membranes with the use of nonwoven fabrics and spacer fabrics as the backing layer. The electrospun membrane samples were fabricated using the PVDF polymer.…”

Section: Electrospun Membranes For Thermally-driven Processesmentioning

confidence: 99%

Electrospun Nanofibrous Membranes for Water Treatment

Shirazi¹,

Bazgir²,

Meshkani³

2020

Advances in Membrane Technologies

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Nanofibrous structures offer a lot of fascinating features due to large specific surface area. This makes them promising for a wide range of applications, most specifically water treatment. This new generation of highly porous membranes exhibits great prospect to be used in various separation applications due to their distinguished features such as remarkably high porosity (≥90%) and interconnected 3D pore structure. As compared with the conventional techniques, Electrospinning has been highlighted for developing unique porous membranes. Electrospun nanofibrous membranes have been more and more investigated to a lot of advanced water treatment purposes. This chapter reviews the updates on electrospun nanofibrous membranes with a particular prominence in recent accomplishments, bottlenecks, and future perspectives in water treatment. To start, the basic principles of electrospinning are discussed. Next, past and recent efforts for fabricating electrospun MF membranes for various applications are reviewed. The application of electrospun nanofibers as the scaffold for TFC (thin-film composite) membranes in the pressure-and osmotic-membrane processes is then introduced. The new application of electrospun nanofibrous membranes for the thermally-driven MD (membrane distillation) process for water treatment as well as strategies for performance enhancement is discussed. To finish, conclusions and perspectives are stated according to recent developments.

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“…Thus, the MTES is equivalent to the maximum energy produced by a mixing process before reaching equilibrium [85,88]. Following Raoult's Law for desalination of an ideal solution [92][93][94][95][96], the MTES (kJ/kg product) can be obtained for an aqueous solution with a steady flow from,…”

Section: Thermodynamics Of Desalinationmentioning

confidence: 99%

Looking Beyond Energy Efficiency: An Applied Review of Water Desalination Technologies and an Introduction to Capillary-Driven Desalination

Ahmadvand

Abbasi

Azarfar

et al. 2019

Water

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Most notable emerging water desalination technologies and related publications, as examined by the authors, investigate opportunities to increase energy efficiency of the process. In this paper, the authors reason that improving energy efficiency is only one route to produce more cost-effective potable water with fewer emissions. In fact, the grade of energy that is used to desalinate water plays an equally important role in its economic viability and overall emission reduction. This paper provides a critical review of desalination strategies with emphasis on means of using low-grade energy rather than solely focusing on reaching the thermodynamic energy limit. Herein, it is argued that large-scale commercial desalination technologies have by-and-large reached their engineering potential. They are now mostly limited by the fundamental process design rather than process optimization, which has very limited room for improvement without foundational change to the process itself. The conventional approach toward more energy efficient water desalination is to shift from thermal technologies to reverse osmosis (RO). However, RO suffers from three fundamental issues: (1) it is very sensitive to high-salinity water, (2) it is not suitable for zero liquid discharge and is therefore environmentally challenging, and (3) it is not compatible with low-grade energy. From extensive research and review of existing commercial and lab-scale technologies, the authors propose that a fundamental shift is needed to make water desalination more affordable and economical. Future directions may include novel ideas such as taking advantage of energy localization, surficial/interfacial evaporation, and capillary action. Here, some emerging technologies are discussed along with the viability of incorporating low-grade energy and its economic consequences. Finally, a new process is discussed and characterized for water desalination driven by capillary action. The latter has great significance for using low-grade energy and its substantial potential to generate salinity/blue energy.

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Fabrication of PVDF nanofibrous hydrophobic composite membranes reinforced with fabric substrates via electrospinning for membrane distillation desalination

Cited by 67 publications

References 44 publications

Enhanced flux in direct contact membrane distillation using superhydrophobic PVDF nanofibre membranes embedded with organically modified SiO₂ nanoparticles

Enhanced flux in direct contact membrane distillation using superhydrophobic PVDF nanofibre membranes embedded with organically modified SiO₂ nanoparticles

Electrospun Nanofibrous Membranes for Water Treatment

Looking Beyond Energy Efficiency: An Applied Review of Water Desalination Technologies and an Introduction to Capillary-Driven Desalination

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Fabrication of PVDF nanofibrous hydrophobic composite membranes reinforced with fabric substrates via electrospinning for membrane distillation desalination

Cited by 67 publications

References 44 publications

Enhanced flux in direct contact membrane distillation using superhydrophobic PVDF nanofibre membranes embedded with organically modified SiO2 nanoparticles

Enhanced flux in direct contact membrane distillation using superhydrophobic PVDF nanofibre membranes embedded with organically modified SiO2 nanoparticles

Electrospun Nanofibrous Membranes for Water Treatment

Looking Beyond Energy Efficiency: An Applied Review of Water Desalination Technologies and an Introduction to Capillary-Driven Desalination

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Product

Resources

About

Enhanced flux in direct contact membrane distillation using superhydrophobic PVDF nanofibre membranes embedded with organically modified SiO₂ nanoparticles

Enhanced flux in direct contact membrane distillation using superhydrophobic PVDF nanofibre membranes embedded with organically modified SiO₂ nanoparticles