Optimization of morphology and perf ormance of PVDF hollow fiber for direct contact membrane distillation using experimental design

Song, Zheng Wei; Jiang, Lan Ying

doi:10.1016/j.ces.2013.06.006

Cited by 60 publications

(19 citation statements)

References 46 publications

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“…Thus, thoroughly investigations are carried out in this work to evaluate if these membranes are suitable for seawater desalination by means of vacuum membrane distillation (VMD) [30][31][32][33][34]. To our best knowledge, this is the first time that MOF-functionalized alumina membranes are used in MD desalination applications.…”

Section: Introductionmentioning

confidence: 99%

Metal–Organic Framework-Functionalized Alumina Membranes for Vacuum Membrane Distillation

Zuo

Chung

2016

Water

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Nature-mimetic hydrophobic membranes with high wetting resistance have been designed for seawater desalination via vacuum membrane distillation (VMD) in this study. This is achieved through molecular engineering of metal-organic framework (MOF)-functionalized alumina surfaces. A two-step synthetic strategy was invented to design the hydrophobic membranes: (1) to intergrow MOF crystals on the alumina tube substrate and (2) to introduce perfluoro molecules onto the MOF functionalized membrane surface. With the first step, the surface morphology, especially the hierarchical roughness, can be controlled by tuning the MOF crystal structure. After the second step, the perfluoro molecules function as an ultrathin layer of hydrophobic floss, which lowers the surface energy. Therefore, the resultant membranes do not only possess the intrinsic advantages of alumina supports such as high stability and high water permeability, but also have a hydrophobic surface formed by MOF functionalization. The membrane prepared under an optimum condition achieved a good VMD flux of 32.3 L/m 2 -h at 60 • C. This study may open up a totally new approach for design of next-generation high performance membrane distillation membranes for seawater desalination.

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Section: Introductionmentioning

confidence: 99%

Metal–Organic Framework-Functionalized Alumina Membranes for Vacuum Membrane Distillation

Zuo

Chung

2016

Water

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“…Porosity of hollow fiber membranes excluding bore channel space was obtained by Eq.

ε = (1 - \frac{m_{fiber} / ρ_{fiber}}{V_{fiber} - V_{channel}}) \times 100 %

where

V_{fiber}

denotes the fiber volume,

V_{channel}

is the inner channel volume,

m_{fiber}

represents the fiber weight, and

ρ_{fiber}

stands for the density of the fiber material.

V_{fiber}

was estimated from fiber diameter and length.…”

Section: Methodsmentioning

confidence: 99%

Exploring the spinning and operations of multibore hollow fiber membranes for vacuum membrane distillation

Wang

Chung

2013

AIChE Journal

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Hollow fiber membranes with a multibore configuration have demonstrated their advantages with high mechanical strength, easy module fabrication, and excellent stability for membrane distillation (MD). In this work, the microstructure of multibore fibers was optimized for vacuum MD (VMD). A microstructure consisting of a tight liquid contact surface and a fully porous cross-section is proposed and fabricated to maximize the wetting resistance and VMD desalination performance. The new membrane exhibited a high VMD flux of 71.8 L m 22 h 21 with a 78 C model seawater feed. Investigations were also carried to examine various effects of VMD operational conditions on desalination performance. The 7-bore membrane showed higher flux and superior thermal efficiency under the VMD configuration than the direct contact MD configuration. Different from the traditional single-bore hollow fiber, the VMD flux of multibore membrane at the lumen-side feed configuration was higher than that of the shell-side feed due to the additional evaporation surface of multibore geometry.

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“…Higher dope concentration of M1 hinders diffusion of molecules and suppresses growth of macropores by enhancing the viscosity [24]; in addition higher content of EG in the dope of M2 facilitates the instantaneous demixing favoring macrovoids. The outer half annulus of both fibers is full of spongy-like structure due to that ethanol is a relatively weak coagulant [23]. The outer surfaces of both M1 and M2 are rough with nodule approximating spherulite structure in shape and morphology.…”

Section: Hollow Fiber Morphologiesmentioning

confidence: 98%

Titanium white sulfuric acid concentration by direct contact membrane distillation

Feng

Jiang

Yang

2016

Chemical Engineering Journal

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Optimization of morphology and perf ormance of PVDF hollow fiber for direct contact membrane distillation using experimental design

Cited by 60 publications

References 46 publications

Metal–Organic Framework-Functionalized Alumina Membranes for Vacuum Membrane Distillation

Metal–Organic Framework-Functionalized Alumina Membranes for Vacuum Membrane Distillation

Exploring the spinning and operations of multibore hollow fiber membranes for vacuum membrane distillation

Titanium white sulfuric acid concentration by direct contact membrane distillation

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