A facile one-step preparation method of recyclable superhydrophobic polypropylene membrane for oil–water separation

Kansara, Ankit M.; Chaudhri, Sanjay G.; Singh, Puyam S.

doi:10.1039/c6ra11008h

Cited by 36 publications

(12 citation statements)

References 29 publications

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“…In the first step, commercially available fumed silica of sizes 7 nm (Sigma‐Aldrich product number S5130) was modified with OTS forming SiOSi chemical bonds by the reaction between surface hydroxyl groups (silanols) of the fumed silica nanoparticles and chlorides of the OTS liberating HCl. Confirmation of the SiOSi chemical bond formation by solid state 29 Si NMR have been reported by us earlier . It showed well resolved peaks at −57 and −68 ppm assigned to the general alkylsiloxane structures (HO) (R)Si(OSi) 2 [isolated silanol, T 2 ] and (R)Si(OSi) 3 [siloxane, T 3 ], where R = alkyl indicating crosslinks with silanols of the silica nanoparticles.…”

Section: Resultssupporting

confidence: 82%

Octadecyl‐silica—PVDF membrane of superior MD desalination performance

Mistry

Saxena

Ray

et al. 2017

J of Applied Polymer Sci

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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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Section: Resultssupporting

confidence: 82%

Octadecyl‐silica—PVDF membrane of superior MD desalination performance

Mistry

Saxena

Ray

et al. 2017

J of Applied Polymer Sci

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“…(a) Oil permeation flux and oil/water separation efficiency by using PDMS/CNF@PU in different cycles and (b) comparison of oil/water separation performance between recently reported membranes and the membrane in this study. ,,,,,− …”

Section: Resultsmentioning

confidence: 91%

Flexible and Superhydrophobic Composites with Dual Polymer Nanofiber and Carbon Nanofiber Network for High-Performance Chemical Vapor Sensing and Oil/Water Separation

Zhang

Huang

Wang

et al. 2020

ACS Appl. Mater. Interfaces

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Polymer nanofiber composites with superhydrophobicity are promising for the chemical vapor sensing or oil/water separation, but it remains challenging to develop superhydrophobic, anticorrosive, and durable nanofiber composites that can achieve both the organic solvent vapor detection and oil (organic solvent)/water separation with high separation flux and excellent recyclability. Here, a flexible, stretchable, and superhydrophobic/ superoleophilic nanofiber composite membrane with excellent photothermal conversion performance is fabricated by decorating carbon nanofibers (CNFs) with a hollow structure onto the polyurethane nanofibers and subsequent polydimethylsiloxane (PDMS) modification. The combination of CNFs and PDMS greatly improves the membrane's tensile strength and Young's modulus without sacrificing its stretchability. The dual polymer nanofiber and CNF network are beneficial to the chemical vapor or liquid diffusion into the membrane and thus can be used for high-performance chemical vapor sensing and oil/water separation. The nanofiber composite is responsive to different organic vapors with a low detection limit and good selectivity. Also, the material can achieve fast oil/water separation with the oil (dichloromethane) permeate flux as high as 6577.3 L m −2 h −1 . In addition, the separation flux and efficiency remain stable during the 30 separated oil/water separation tests, exhibiting excellent recyclability.

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“…Therefore, it is particularly urgent to find a new solution for resource utilization different from the traditional incineration and landfill treatment. 6 , 7 For example, Singh et al 8 used a one-step preparation method to impregnate surface-modified silica particles on commercial PP nonwovens to produce superhydrophobic properties and excellent oil–water separation capabilities. Soochan et al 9 sulfonated MFs soaked in fuming sulfuric acid to prepare a separator with high safety and excellent electrochemical properties for water-based rechargeable batteries.…”

Section: Introductionmentioning

confidence: 99%