An experimental investigation of evaporation time and the relative humidity on a novel positively charged ultrafiltration membrane via dry–wet phase inversion

Gao, Li; Tang, Beibei; Wu, Peiyi

doi:10.1016/j.memsci.2008.09.048

Cited by 57 publications

(26 citation statements)

References 25 publications

(25 reference statements)

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“…This morphology causes smaller membrane flux, while rejection will increase. These results have been confirmed with previous researchers [10][11]. Therefore, for further investigation needs to be conducted to obtain the optimum evaporation time which produces an excelent membrane separation performance.…”

Section: Introductionsupporting

confidence: 86%

“…This is because during evaporation of solvent, the polymer concentration in the surface layer increased which will form a dense surface. Moreover, this layer will inhibit the speed of solvent exchange with non-solvent through a membrane sub-layer during coagulation processes and produced a smaller pore size and ultimately will reduce the flux [11]. That the longer of evaporation time can also increase the active layer thickness of the membrane.…”

Section: Effect Of Solvent Evaporation Time On the Performance Of Ca mentioning

confidence: 99%

“…At the evaporation time of 1-2 minutes, the effect of solvent evaporation is almost balanced by the effects of water absorption, so that the pore size in the range appears at this time. However, more than 2 minutes evaporation will cause the water absorption become a major factor during the evaporation process, so it will form a membrane with a larger pore size [11].…”

Section: Effect Of Evaporation Time On the Morphology Of Ca Membranementioning

confidence: 99%

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Effect of combination dope composition and evaporation time on the separation performance of cellulose acetate membrane for demak brackish water treatment

et al. 2017

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Abstract. The coastal areas in Indonesia often have a problem of clean water lack, because the water is classified as brackish water. Therefore, this research investigated the fabrication of CA membranes using phase inversion method for brackish water treatment. Investigation was conducted to study the effect of combination dope composition and evaporation time on separation performance and morphology of the memrbane. Membrane was fabricated by dry-wet phase inversion technique with variation of polymer concentration 17, 18 and 20 wt% in the total solid and evaporation time of 5, 10 and 15 seconds, respectively. The asymmetric membranes were characterized by permeability test through rejection and flux measurements using brackish water as feed. The experimental results from SEM images analysis showed that all the membranes have a thin small porous layer and thicker sub-structure of larger porous layer formed asymmetric membrane. Moreover, the greater polymer concentration is resulting smaller pore size and smaller membrane porosity. The longer evaporation time was also resulted in denser membrane active layer. The best membrane performance was observed at the composition of 20 wt% CA polymer, 1 wt % polyethylene glycol with the solvent evaporation time of 15 seconds.

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Section: Introductionsupporting

confidence: 86%

Section: Effect Of Solvent Evaporation Time On the Performance Of Ca mentioning

confidence: 99%

Section: Effect Of Evaporation Time On the Morphology Of Ca Membranementioning

confidence: 99%

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Effect of combination dope composition and evaporation time on the separation performance of cellulose acetate membrane for demak brackish water treatment

et al. 2017

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“…The degree of bromination was controlled by adding a given amount of bromine while the substitution position (benzyl or aryl) was controlled by the temperature [20]. The final solution was precipitated with methanol, washed by deionized water, and dried at 60 • C for at least 20 h to obtain the brominated polymer.…”

Section: Brominationmentioning

confidence: 99%

Novel ultrafiltration membranes prepared from a multi-walled carbon nanotubes/polymer composite

Tang

2010

Journal of Membrane Science

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157

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“…Meanwhile, the skin layer also influenced the subsequent phase inversion process of sublayers during membrane formation, which then influence the final membrane structure and performance. 43 Figure 2 shows the SEM micrographs of the resultant membranes; M1−M6 are presented with 50 000× magnified image inset in the 5000× magnified image; however, the 5000× magnified image was inset into the 1000× magnified image for M7−M9 because of the higher pore size. All membranes showed open porous structure with crystals in the surface, which presented a similar microstructure as the lotus leaf (for M1−M6) and the electrospun nanofiber membrane (for M7− M9), because PVDF-CTFE has a higher crystallization tendency as confirmed in our previous work.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

Preparation of Interconnected Biomimetic Poly(vinylidene fluoride-co-chlorotrifluoroethylene) Hydrophobic Membrane by Tuning the Two-Stage Phase Inversion Process

Zheng

Wang²,

et al. 2016

ACS Appl. Mater. Interfaces

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A facile strategy was applied for poly(vinylidene fluoride-cochlorotrifluoroethylene) (PVDF-CTFE) hydrophobic membrane preparation by tuning the two-stage phase inversion process. The exposure stage was found to benefit the solid−liquid demixing process (gelation/crystallization) induced by the solvent evaporation and the subsequent phase inversion induced by immersion benefit the liquid−liquid demixing. It was confirmed that the electrospun nanostructure-like biomimetic surface and interconnected pore structure can be expected by controlling the exposure duration, and 300 s was considered as the inflection point of exposure duration for PVDF-CTFE membrane through which a tremendous variation would show. The micro/ nanohierarchical structure in the membrane surface owing to the crystallization of PVDF-CTFE copolymer was responsible for the improvement of membrane roughness and hydrophobicity. Meanwhile, the interconnected pore structure in both the surface and the cross-section, which were formed because of the crystallization process, offers more mass transfer passages and enhances the permeate flux. The membrane then showed excellent MD performance with high permeate flux, high salt rejection, and relatively high stability during a 48 h continuous DCMD operation, according to the morphology, pore structure, and properties, which can be a substitute for hydrophobic membrane application.

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An experimental investigation of evaporation time and the relative humidity on a novel positively charged ultrafiltration membrane via dry–wet phase inversion

Cited by 57 publications

References 25 publications

Effect of combination dope composition and evaporation time on the separation performance of cellulose acetate membrane for demak brackish water treatment

Effect of combination dope composition and evaporation time on the separation performance of cellulose acetate membrane for demak brackish water treatment

Novel ultrafiltration membranes prepared from a multi-walled carbon nanotubes/polymer composite

Preparation of Interconnected Biomimetic Poly(vinylidene fluoride-co-chlorotrifluoroethylene) Hydrophobic Membrane by Tuning the Two-Stage Phase Inversion Process

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