Nonsolvent induced phase separation preparation of poly(vinylidene fluoride-co-chlorotrifluoroethylene) membranes with tailored morphology, piezoelectric phase content and mechanical properties

Despite its widespread industrial and residential uses for production of potable water, the reverse osmosis (RO) desalination process has some drawbacks by discharging harmful concentrated saline water as reject stream. A hydrophobic porous membrane can treat such environmentally unfriendly RO reject stream via Membrane Distillation (MD) process. Here, we describe preparation of superior polyvinylidenefluoride (PVDF) membrane modified with superhydrophobic silica nanoparticles for desalination application. Superhydrophobicity (contact angle of 1518) of silica nanoparticles of 7 nm sizes was achieved by reaction of the silica particles with octadecyltrichlorosilane in toluene to form ASiAOASiA links with C18 alkyl chain. A homogeneous polymer dope mixture containing a desired amount of modified silica colloids suspended in toluene was used for the membrane preparation. The PVDF membrane with optimal silica content exhibited excellent flux with >99% salt rejection efficiency when used for MD at room temperature from the saline water feed of 3.5 wt % NaCl. The prepared hydrophobic PVDF membrane has the potential for MD application in treating the RO reject stream and other aqueous industrial effluents. V C 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018, 135, 46043.

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“…The percent crystallinity of the β‐phase can be estimated by a general equation

% X_{β} = 100 \cdot \frac{A_{β}^{}}{true(\frac{K_{β}}{K_{α}} true) \cdot A_{α}^{} + A_{β}^{}}

…”

Section: Resultsmentioning

confidence: 99%

Octadecyl‐silica—PVDF membrane of superior MD desalination performance

Mistry

Saxena

Ray

et al. 2017

J of Applied Polymer Sci

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“…In this study, application of moringa (Moringa oleifera) seed powder synthesized using TiO 2 as blending of PVDF membrane, as wastewater treatment from coal mining, is shown in (Table 1) The use of PVDF membrane-TiO 2 synthesis-moringa seed powder in coal wastewater treatment resulted in a decrease along with the effect of TiO 2 concentration within the membrane, in which the highest decline was found in concentration of TiO 2 5 % and moringa seed powder 5%, namely in membrane D, while in membrane A that was without TiO 2 synthesis-moringa seed powder, the degradation of coal wastewater water quality was higher compared to that in membrane B, C and D. It is due to the effect of TiO 2 synthesis on moringa seed powder. Decline in membrane structure symmetry increase with low molecular mass was also possible, which further decreased the pore size, thus resulted in decreasing adsorption on pollutant [24][25]. Different from the study conducted by Marhaini et al, 2018, coal wastewater treatment using TiO 2 synthesis-moringa seed powder with effect of stirring period of 250 minutes, was able to degrade coal wastewater up to 88%.…”

Section: The Use Of Pvdf Membrane Tio 2 Synthesis-moringa (Moringa Olmentioning

confidence: 76%

“…The results show that the membrane has a typical asymmetrical structure with a dense outer skin layer, has a perfect pore on the membrane surface with supporting layer of more open micropore. According to (Cardoso et al, 2015;Hassankiadeh et al, 2014;Matsuyana et al, 2002), the pore size of the membrane surface decreases with increasing molecular weight of PVDF.…”

Section: Environmental Scanning Electron Microscope (Esem)mentioning

confidence: 99%

“…Result showed that the membrane had a typical asymmetrical structure with outer solid skin layer, perfect pores on membrane surface with support layer in the form of more open micropore. According to [24][25][26] the size of membrane surfac pore decreases along with the increasing molecular mass of PVDF.…”

Section: Environmental Scanning Electron Microscope (Esem)mentioning

confidence: 99%

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Application of Membran Polyvinylidenefluoride (PVDF) Synthesis Blending TiO<sub>2</sub>-Serbuk Kelor (Moringa Oleifera) Seed on Coal Wastewater Treatment

Marhaini¹,

Legiso²,

Rochyani³

2019

IJEC

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Membrane technology is the right choice with its ability as a highly selective separation process to produce high quality products. The technology research applied based on chemical technology of Advanced Oxidation Process (AOP), a technology of coal wastewater treatment using strong oxidizing agents with photocatalysts TiO 2 and moringa seed powder (Moringa oleifera). The research methodology used was preparation of Moringa seeds, synthesis of composite photocatalyst TiO 2-Moringa seed powder and manufacture of membrane Polyinylideneflouride (PVDF)-Moringa seed powder with a total of 4 membranes (A, B, C, D). The results of the study produced membrane characteristics with a pore size of 0,1 µm-6 µm, wet weight of 20% and an average tensile test value of 4.53 N/mm2. Application of membrane PVDF-synthesis TiO 2-Moringa seed powder (Moringa oleifera) in coal wastewater treatment resulted in a decrease of 89% in Fe and Mn pollutants in the composition of 5% TiO 2 and 5% Moringa seed powder in Membrane B.

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“…The degree of crystallinity and the microstructure of the composite films are the main factor influencing the mechanical properties [35], which are very important for their viability in different applications. To investigate this further, stress-strain curves were measured and are shown in Figure 8-a.…”

Section: Mechanical Characterizationmentioning

confidence: 99%

Ionic liquids for the control of the morphology in poly(vinylidene fluoride-co-hexafluoropropylene) membranes

et al. 2018

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Abstract:The development of polymer membranes with tailored micro-morphology and wettability is a demand in the areas of filtration, sensors, and tissue engineering, among others. The thermoplastic copolymer poly(vinylidene fluoride-cohexafluoropropylene) (PVDF-HFP), is one of the most widely used polymers for these applications due to its good mechanical and thermal properties, biocompatibility and low density. Although the control of the PVDF-HFP morphology is a complicated task, the introduction of ionic liquids (ILs) in the PVDF-HFP matrix opens news perspectives in this area. This

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Nonsolvent induced phase separation preparation of poly(vinylidene fluoride-co-chlorotrifluoroethylene) membranes with tailored morphology, piezoelectric phase content and mechanical properties

Cited by 55 publications

References 25 publications

Octadecyl‐silica—PVDF membrane of superior MD desalination performance

Octadecyl‐silica—PVDF membrane of superior MD desalination performance

Application of Membran Polyvinylidenefluoride (PVDF) Synthesis Blending TiO<sub>2</sub>-Serbuk Kelor (Moringa Oleifera) Seed on Coal Wastewater Treatment

Ionic liquids for the control of the morphology in poly(vinylidene fluoride-co-hexafluoropropylene) membranes

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Nonsolvent induced phase separation preparation of poly(vinylidene fluoride-co-chlorotrifluoroethylene) membranes with tailored morphology, piezoelectric phase content and mechanical properties

Cited by 55 publications

References 25 publications

Octadecyl‐silica—PVDF membrane of superior MD desalination performance

Octadecyl‐silica—PVDF membrane of superior MD desalination performance

Application of Membran Polyvinylidenefluoride (PVDF) Synthesis Blending TiO&lt;sub&gt;2&lt;/sub&gt;-Serbuk Kelor (Moringa Oleifera) Seed on Coal Wastewater Treatment

Ionic liquids for the control of the morphology in poly(vinylidene fluoride-co-hexafluoropropylene) membranes

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Application of Membran Polyvinylidenefluoride (PVDF) Synthesis Blending TiO<sub>2</sub>-Serbuk Kelor (Moringa Oleifera) Seed on Coal Wastewater Treatment