Fabrication and characterization of modified PVDF hollow fiber membrane coated with hydrophobic surface modifying macromolecules for desalination application

Kusuma, Nindita Cahya; Purwanto, Mochammad; Sudrajat, Ma’rup Ali; Jaafar, Juhana; Othman, Mohd Hafiz Dzarfan; Aziz, Mustafa Kamal Abdul; Raharjo, Yanuardi; Qtaishat, M.

doi:10.1016/j.jece.2021.105582

Cited by 14 publications

(5 citation statements)

References 25 publications

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“…It exhibits a magnitude of 143.4°, which was similar to that of the porous spheres ( Figure 1 E) but much higher than neat PLLA ( Figure 1 D). The high WCA of porous PVDF spheres can be interpreted as follows: On one hand, PVDF itself is a well-known hydrophobic material, which has been widely used in water treatment [ 27 , 28 , 29 ]. On the other hand, there is hierarchical roughness on the surface of porous PVDF spheres.…”

Section: Resultsmentioning

confidence: 99%

Programmable Transition between Adhesive/Anti-Adhesive Performances on Porous PVDF Spheres Supported by Shape Memory PLLA

et al. 2022

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Superhydrophobic surfaces with switchable adhesive/anti-adhesive performances are highly desired but still challenging. Herein, by loading porous poly (vinylidene fluoride) (PVDF) spheres on a shape memory polylactic acid (PLLA) film, a quasi-superhydrophobic surface of composite film (PVDF@PLLA) with the ability to tailor its surface structures/composition and related adhesive behaviors was fabricated. The as-prepared surface is covered by porous PVDF spheres. The combination of hydrophobicity of PVDF and hierarchical roughness resulted from porous spheres contributing to the high contact angle and low sliding angle, corresponding to Cassie state and lotus leaves effect. Upon uniaxial or biaxial tension, the distance among hydrophobic spheres is so high that more and more hydrophilic defects (PLLA film) have been exposed to water droplets, accounting for the quasi-superhydrophobic surface with a higher sliding angle. This is the reason for the Wenzel state and rose petals effect. After heating, PLLA film recovers to its original state. The porous PVDF spheres cover the whole film again, leading to the enhanced mobility of water droplets on the surface. The transition between the rose petals effect and the lotus leaves effect is programmable and reversible. Our result provides a novel strategy to tailor adhesive behaviors by combining (quasi-)superhydrophobic surface with shape memory effect.

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Section: Resultsmentioning

confidence: 99%

Programmable Transition between Adhesive/Anti-Adhesive Performances on Porous PVDF Spheres Supported by Shape Memory PLLA

et al. 2022

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“…Critical variables directly influencing membrane performance include porosity and pore diameter, as they play a significant role in determining the efficiency of oil/water separation [46,47]. Figure 6A illustrates the porosity of PLA/PBAT and PLA/PBAT membranes with varying amounts of BP-NPs.…”

Section: Membrane Porosity Mean Pore Size and Thicknessmentioning

confidence: 99%

Modification of Polylactide-poly (butylene adipate-co-terephthalate) (PLA/PBAT) Mixed-Matrix Membranes (MMMs) with Green Banana Peel Additives for Oil Wastewater Treatment

Ghadhban,

Rashid,

Abdulrazak

et al. 2024

Water

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Ultrafiltration membranes are often considered a highly efficient technique for purifying oily wastewater. The primary objective of this research was to improve the performance and antifouling properties of PLA/PBAT membranes used in oily wastewater treatment by incorporating banana peel (BP) nanoparticles. Various characterization techniques, including field emission scanning electron microscopy (FESEM), wettability analysis, pure water flux measurement, porosity assessment, tensile analysis, and FTIR analysis, were employed to describe the prepared membranes. The results of the FT-IR test revealed that BP nanoparticles were effectively integrated into the PLA/PBAT membrane matrix. The contact angle decreased from 73.7° for the pristine PLA/PBAT membrane to 38.99° for the membrane incorporating 0.05 wt.% BP-NPs, indicating that the nanoparticles enhanced the hydrophilic characteristics of the membranes. A similar trend was observed for the pure water flux of PLA/PBAT/BP membranes, suggesting that membranes with a BP-NP concentration of 0.05 weight percent exhibited the highest pure water flux. This improvement can be attributed to the synergistic effects of the nanoparticles. Additionally, the presence of BP-NPs enhanced the mechanical properties of the membranes. Finally, an ultrafiltration system using oily wastewater as feed was employed to evaluate the performance of the prepared membranes. The finding demonstrated that PLA/PBAT/BP membranes exhibited a higher flux and a greater oil removal efficiency of 105.3 L/m2h and 95.2% compared to neat PLA/PBAT membranes (62 L/m2h and 88%), respectively.

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“…DCMD process technology has the following major drawbacks: low flow rate compared with reverse osmosis, wetting of membrane pores, low salt rejection rate, membrane stability, and membrane fouling. The most adopted membranes for DCMD processes are hydrophobic and porous based on different hydrophobic polymer supports such as poly(vinylidene fluoride) (PVDF), − plysulfone (PSU), , poly(ether sulfone) (PES), , poly(tetrafluoroethylene) (PTFE), and polypropylene (PP). , …”

Section: Introductionmentioning

confidence: 99%

Ionic Liquids and Activated Carbon: Effective Materials for the Sustainable Production of Fresh Water from Salt Effluents (BRINE)

Ouchn,

Chaouqi,

Oukkass

et al. 2024

ACS Sustainable Chem. Eng.

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Water stress in Morocco is a major concern and considerably affects the economic and social sectors. Seawater desalination processes are part of the solutions adopted, and direct contact membrane distillation (DCMD) processes have been proposed to treat salty discharge from reverse osmosis units. Recently, composite polymer membranes based on ionic liquids (ILs) have been adopted for extraction and separation processes. In this context, a composite membrane was prepared based on polymer supports poly(vinylidene fluoride) (PVDF) and polysulfone (PSU) and ionic liquid trioctylmethylammonium oleate (TOMAO) and doped with activated carbon (AC). The PVDF/ PSU -IL-AC membrane has been adopted in DCMD processes for the diffusion and extraction of water vapor (WV). This composite membrane has good hydrophobicity (126.04°) and high porosity (91.07%). Significant flux 18.29 kg m −2 h −1 and salt rejection 99.93% were observed at 60 °C, with good reproducibility of the results (9 weeks). The activation parameters E a , ΔH # , and ΔS # were quantified, the diffusion mechanism of water molecules through the membrane has been identified, and the roles of IL and AC have been elucidated. All results indicate that the developed membrane is an effective tool for producing pure water from saline waters (BRINE). Finally, seawater desalination tests were carried out under optimal conditions.

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Fabrication and characterization of modified PVDF hollow fiber membrane coated with hydrophobic surface modifying macromolecules for desalination application

Cited by 14 publications

References 25 publications

Programmable Transition between Adhesive/Anti-Adhesive Performances on Porous PVDF Spheres Supported by Shape Memory PLLA

Programmable Transition between Adhesive/Anti-Adhesive Performances on Porous PVDF Spheres Supported by Shape Memory PLLA

Modification of Polylactide-poly (butylene adipate-co-terephthalate) (PLA/PBAT) Mixed-Matrix Membranes (MMMs) with Green Banana Peel Additives for Oil Wastewater Treatment

Ionic Liquids and Activated Carbon: Effective Materials for the Sustainable Production of Fresh Water from Salt Effluents (BRINE)

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