Hollow fibers for seawater desalination from blends of PVDF with different molecular weights: Morphology, properties and VMD performance

Figoli, Alberto; Simone, Silvia De; Criscuoli, A.; Aljlil, Saad A.; Shabouna, F.S. Al; AlRomaih, Hamad; Nicolò, E. Di; Alharbi, Omar; Drioli, Enrico

doi:10.1016/j.polymer.2014.01.035

Cited by 71 publications

(55 citation statements)

References 37 publications

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“…The final membrane prepared from the optimum condition shows a good flux of 32.3 L/m 2 -h at 60 °C feed temperature. Table 4 compares it with other VMD membranes made from various materials for seawater desalination [53][54][55][56][57][58].The newly designed membrane exhibits a superior flux owing to its unique morphology formed from a nature-mimetic surface structure. The microstructure control of MOF crystals and the hydrophobic floss growth have enabled the novel membrane for VMD applications.…”

Section: Effect Of Second Mof Growth Time On Membrane Performancementioning

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: Effect Of Second Mof Growth Time On Membrane Performancementioning

confidence: 99%

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

Zuo

Chung

2016

Water

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“…Thus, water flux in MD is negligibly affected by the feed water salinity. In other words, MD can be used for desalinating hypersaline feed streams or to achieve high water recovery desalination [11][12][13][14][15][16]. Given the discontinuity of the liquid phase across the membrane and a small hydraulic pressure on the membrane surface, MD is less susceptible to membrane fouling compared to RO, and hence does not require extensive pre-treatment [7].…”

Section: Introductionmentioning

confidence: 99%

Optimising thermal efficiency of direct contact membrane distillation by brine recycling for small-scale seawater desalination

Duong

Cooper

Nelemans³

et al. 2015

Desalination

108

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A technique to optimise thermal efficiency using brine recycling during direct contact membrane distillation (DCMD) of seawater was investigated. By returning the hot brine to the feed tank, the system water recovery could be increased and the sensible heat of the hot brine was recovered to improve thermal efficiency. The results show that in the optimal water recovery range of 20 to 60% facilitated by brine recycling, the specific thermal energy consumption of the process could be reduced by more than half. It is also noteworthy that within this optimal water recovery range, the risk of membrane scaling is negligible -DCMD of seawater at a constant water recovery of 70% was achieved for over 24. h without any scale formation on the membrane surface. In contrast, severe membrane scaling was observed when water recovery reached 80%. In addition to water recovery, other operating conditions such as feed temperature and water circulation rates could influence the process thermal efficiency. Increasing the feed temperature and reducing the circulation flow rates increased thermal efficiency. Increasing the feed temperature could also mitigate the negative effect of elevated feed concentration on the distillate flux, particularly at a high water recovery. Abstract:A technique to optimise thermal efficiency using brine recycling during direct contact membrane distillation (DCMD) of seawater was investigated. By returning the hot brine to the feed tank, the system water recovery could be increased and the sensible heat of the hot brine was recovered to improve thermal efficiency. The results show that in the optimal water recovery range of 20 to 60% facilitated by brine recycling, the specific thermal energy consumption of the process could be reduced by more than half. It is also noteworthy that within this optimal water recovery range, the risk of membrane scaling is negligible  DCMD of seawater at a constant water recovery of 70% was achieved for over 24 hours without any scale formation on the membrane surface. In contrast, severe membrane scaling was observed when water recovery reached 80%. In addition to water recovery, other operating conditions such as feed temperature and water circulation rates could influence the process thermal efficiency. Increasing the feed temperature and reducing the circulation flow rates increased thermal efficiency. Increasing the feed temperature could also mitigate the negative effect of elevated feed concentration on the distillate flux, particularly at a high water recovery.

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“…Measurements were carried out as described elsewhere [40], within a range of Torque between 10% and 90%. A first set of experiments was carried out at 85 • C, measuring viscosity as a function of the shear rate.…”

Section: Dope Viscosity Measurementsmentioning

confidence: 99%

“…The composition of the dopes used for the spinning experiments are listed in Table 3. Hollow fibers were produced as described elsewhere [20,[40][41][42], by the dry/wet technique. Detailed spinning conditions of each experiment are reported in Table 4.…”

Section: Dope Viscosity Measurementsmentioning

confidence: 99%

Preparation and Characterization of Polymeric-Hybrid PES/TiO2 Hollow Fiber Membranes for Potential Applications in Water Treatment

Simone

Galiano

Faccini

et al. 2017

Fibers

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Abstract:In this work, poly(ethersulfone) (PES) ultrafiltration (UF) hollow fibers (HF) were modified by introducing TiO 2 nanoparticles (TiO 2 -NPs) in the polymeric dope, to endow them with photocatalytic properties. Different dope compositions and spinning conditions for producing "blank" PES UF fibers with suitable properties were investigated. PEO-PPO-PEO (Poly(ethylene glycol)-block-poly(propylene glycol)-block-poly(ethylene glycol, Pluronic ® (Sigma-Aldrich, Milan, Italy) was finally selected as the additive and a suitable dope composition was identified. After the detection of an appropriate dope composition and the optimization of the spinning parameters, PES-TiO 2 HF was produced. The optimized composition was employed for preparing the mixed matrix HF loaded with TiO 2 NPs. The effect of different TiO 2 NP (0.3-1 wt %) concentrations and bore fluid compositions on the fiber morphology and properties were explored. The morphology of the produced fibers was analyzed by Scanning Electron Microscopy (SEM). Fibers were further characterized by measuring: pore size diameters and thickness, porosity, and pure water permeability (PWP). The photocatalytic activity of the new membranes was also tested by UV light irradiation. The model "foulant" methylene blue (MB) was used in order to prove the efficiency of the novel UF membrane for dye photo-degradation.

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Hollow fibers for seawater desalination from blends of PVDF with different molecular weights: Morphology, properties and VMD performance

Cited by 71 publications

References 37 publications

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

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

Optimising thermal efficiency of direct contact membrane distillation by brine recycling for small-scale seawater desalination

Preparation and Characterization of Polymeric-Hybrid PES/TiO2 Hollow Fiber Membranes for Potential Applications in Water Treatment

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