Novel three-dimensional superhydrophobic and strength-enhanced electrospun membranes for long-term membrane distillation

Su, Chunlei; Chang, Junjun; Tang, Kexin; Gao, Fang; Li, Yuping; Cao, Hongbin

doi:10.1016/j.seppur.2017.01.050

Cited by 73 publications

(26 citation statements)

References 45 publications

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“…Moreover, the dispersion of NPs in the top layer dispersed well for membranes D1, D2 and D3, but for 2% loading of ZnO (membrane D4), some of the NPs agglomerate on the membrane surface. According to Su et al, the dispersion of inorganic NPs limits the movement of PVDF polymeric chains and resulted in a rigid membrane layer 21 . The loading of 2.0 % ZnO NPs might be excessive in the casting solution; thus it was agglomerated due to the limitation of free movement of the polymer chains.…”

Section: Resultsmentioning

confidence: 99%

“…The morphology of the top and bottom layers was interconnected fibrous structures throughout the membrane, and this would improve the membrane hydrophobicity and strengthen the mechanical property of the membrane. The mechanical strength of the membranes was attributed to the behaviour of these inorganic NPs that cross‐link via dispersing into the polymeric matrix 21 . The utilisation of ethanol as the low non‐solvent for coagulation bath during the phase inversion process leads to slow demixing, which allows the solvent–non‐solvent exchange works slowly and producing a sponge‐like membrane 23,24 .…”

Section: Resultsmentioning

confidence: 99%

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Effect of ZnO nanoparticles loading in double‐layer polyvinylidene fluoride membrane for desalination via direct contact membrane distillation

Radzi

Ahmad

2020

Asia-Pacific J Chem Eng

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In this study, double‐layer flat sheet membranes consist of nanocomposite polyvinylidene fluoride (PVDF)–ZnO layer on the top, whereas pristine polymeric PVDF on the bottom was fabricated via the double‐casting phase inversion (DCPI) method. The nanocomposite layer was prepared by loading 0.5%, 1.0%, 1.5% and 2.0% of ZnO nanoparticles. The morphology of the membranes changed as ZnO nanoparticles were introduced in the top layer, where the structure is more rigid and porous than the bottom layer. The increment concentration of nanoparticles in the top layer of the double‐layer membrane gives an effect in increasing of water contact angle slightly, which is from 136° to 140°. Furthermore, the liquid entry pressure of water (LEPw) decreases gradually from 0.69 to 0.4 bar with a high concentration of ZnO due to the presence of large pores. The increment concentration of ZnO nanoparticles also resulted in high porosity and reduced pore size, which reduce the resistance of water vapour to pass through the pores as well as enhancing the performance of membrane distillation (MD). Direct contact membrane distillation (DCMD) experiments were carried out to evaluate the efficiency of the fabricated double‐layer membrane in the desalination of seawater from fish farm water for 6‐h operation. The optimal double‐layer membrane with 0.5% ZnO nanoparticles loading maintained a stable flux of 9.42 L/m2h with 99.9% salt rejection and has antifouling properties. The results indicated that the fabricated double‐layer membrane via the DCPI method fulfils the required properties for MD application with excellent salt rejection.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Effect of ZnO nanoparticles loading in double‐layer polyvinylidene fluoride membrane for desalination via direct contact membrane distillation

Radzi

Ahmad

2020

Asia-Pacific J Chem Eng

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“…57,58 The high mechanical strength can be attributed to the cross-linker behavior of this nanoparticle that is attained by the dispersion of inorganic nanoparticle into the polymeric matrix. 59,60 In the case of the cross-linker behavior of these nanoparticles, it suggested that the presence of PS/ZnO hybrid nanocomposite within the membrane matrix limits the movement of the PVDF polymeric chains segments and increases the rigidity of the polymeric chains. Indeed, the nanoparticles can act as temporary crosslinks between the polymer chains, which provides localized regions of enhanced strength.…”

Section: Mechanical Propertiesmentioning

confidence: 99%

Highly permeable PVDF membrane with PS/ZnO nanocomposite incorporated for distillation process

et al. 2018

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“…These factors determine the formation of voids or free spaces on the surface of the membrane where air pockets can be entrapped. These air‐filled gaps increase the interface between air and water and thus increase the hydrophobicity of the membrane …”

Section: Resultsmentioning

confidence: 99%

Electrospun polymer blend with tunable structure for oil–water separation

Jurdi

Zaidouny

Daher

et al. 2018

J of Applied Polymer Sci

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In this study, polyurethane (PU) alone or in blend with 10% polystyrene (PS) or poly(vinylidene fluoride‐co‐hexafluoropropylene) (PVDF‐HFP) was used for electrospinning (ES) of nanofibers. The optimum conditions for obtaining the minimum fiber diameter were found to be [polymer] = 10 wt %, polymer feed rate = 2 mL h−1, voltage = 21 kV, tip to collector distance = 21 cm, and the drum speed = 600 rpm. The time of ES was used as a parameter for controlling the thickness and the average pore size diameter of the membranes. The average pore size diameter decreased almost linearly by increasing the thickness. The resulting electrospun membranes were hydrophobic and oleophilic in nature with the water contact angle above 130°. The hydrostatic pressure head of the membranes increased by decreasing the average pore size diameter. The maximum initial oil separation flux was achieved for the membranes with larger average pore size diameters in the order of: PU9:1PS > PU > PU9:1PVDF‐HFP. The membranes were used for four consecutive cycles without any noticeable loss of separation performance. The diesel oil recovery percentage after 1 h was found to be above 85% for the PU9:1PS and PU membranes. A commercially available polytetrafluoroethylene membrane, with a thickness of 94 μm and the average pore size diameter of 0.45 μm, was used for benchmarking. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018, 135, 46890.

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Novel three-dimensional superhydrophobic and strength-enhanced electrospun membranes for long-term membrane distillation

Cited by 73 publications

References 45 publications

Effect of ZnO nanoparticles loading in double‐layer polyvinylidene fluoride membrane for desalination via direct contact membrane distillation

Effect of ZnO nanoparticles loading in double‐layer polyvinylidene fluoride membrane for desalination via direct contact membrane distillation

Highly permeable PVDF membrane with PS/ZnO nanocomposite incorporated for distillation process

Electrospun polymer blend with tunable structure for oil–water separation

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