Novel hydrophobic polyvinyl alcohol–formaldehyde foams for organic solvents absorption and effective separation

Pan, Yanxiong; Wang, Weicai; Peng, Chao; Shi, Kai; Luo, Yong

doi:10.1039/c3ra43907k

Cited by 58 publications

(28 citation statements)

References 55 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In contrast, hexane was more likely to be absorbed due to its high uidity. 56 Furthermore, as discussed above, propyl groups inside the pores may inhibit the reaction between -OH and TMCS due to the steric effect. Comparably, the absorption efficiency of DBP was largely restricted because of its large steric conguration.…”

Section: Resultsmentioning

confidence: 99%

Organic–inorganic hybridization for the synthesis of robust in situ hydrophobic polypropylsilsesquioxane aerogels with fast oil absorption properties

Zhang

et al. 2018

RSC Adv.

View full text Add to dashboard Cite

show abstract

Section: Resultsmentioning

confidence: 99%

Organic–inorganic hybridization for the synthesis of robust in situ hydrophobic polypropylsilsesquioxane aerogels with fast oil absorption properties

Zhang

et al. 2018

RSC Adv.

View full text Add to dashboard Cite

show abstract

“…Plain PVDF nanofibers exhibited a contact angle measurement of 136.38º, while after PAA coating, the contact angle dramatically decreased to 74.82º. It is well known that, a relatively high hydrophobicity of PVDF is due to its structure, as well as the low surface energy of PVDF [34]. The change in hydrophilicity observed…”

Section: Fig 2 Fesem Images Of the (A-b) Top Surface Of And (C-d) Cmentioning

confidence: 84%

Modification of Nanofiber Support Layer for Thin Film Composite Forward Osmosis Membranes via Layer-By-Layer Polyelectrolyte Deposition

Gonzales

Park

Tijing

et al. 2018

Preprint

View full text Add to dashboard Cite

Electrospun nanofiber-supported thin film composite membranes are among the most promising membranes for seawater desalination via forward osmosis. In this study, a high-performance electrospun polyvinylidenefluoride (PVDF) nanofiber-supported TFC membrane was successfully fabricated after molecular layer-by-layer polyelectrolyte deposition. Negatively-charged electrospun polyacrylic acid (PAA) nanofibers were deposited on electrospun PVDF nanofibers to form a support layer consisted of PVDF and PAA nanofibers. This resulted to a more hydrophilic support compared to the plain PVDF nanofiber support. The PVDF-PAA nanofiber support then underwent a layer-by-layer deposition of polyethylenimine (PEI) and PAA to form a polyelectrolyte layer on the nanofiber surface prior to interfacial polymerization, which forms the selective polyamide layer of TFC membranes. The resultant PVDF-LbL TFC membrane exhibited enhanced hydrophilicity and porosity, without sacrificing mechanical strength. As a result, it showed high pure water permeability and low structural parameter values of 4.12 Lm and 221 µm, respectively, significantly better compared to commercial FO membrane. Layer-by-layer deposition of polyelectrolyte is therefore a useful and practical modification method for fabrication of high performance nanofiber-supported TFC membrane.

show abstract

“…The significant difference in the contact angle can be observed in the profiles as shown in Figure (a). The high WCA for the pristine PVDF membrane is due to the hydrophobic property and low surface energy of PVDF . However, the PVDF/PVA‐blended membranes have started with a WCA of 86.4°, 79.5°, 74.5°, and 82.8° for P1, P2, P3, and P4, respectively.…”

Section: Resultsmentioning

confidence: 99%

Super‐hydrophilic electrospun PVDF/PVA‐blended nanofiber membrane for microfiltration with ultrahigh water flux

Zhou

et al. 2019

J of Applied Polymer Sci

View full text Add to dashboard Cite

This work provides a novel approach to improve not only water flux but also fouling resistance of Polyvinylidene fluoride (PVDF) membranes. PVDF/Poly(vinyl alcohol) (PVA)-blended nanofiber membranes were prepared via electrospinning method. The structure and performance of blended nanofiber membranes were characterized by scanning electron microscopy (SEM), atomic force microscope (AFM), attenuated total reflection-Fourier-transform infrared (ATR-FTIR) spectroscopy, X-ray photoelectron spectroscopy (XPS), contact angle measurement, tensile mechanical measurement, and filtration experiments. These results indicate that PVA was uniformly blend in the PVDF matrix. This blended nanofiber membranes with the ridge-and-valley structure and bicontinuous phase exhibited the hydrophilic performance and super-wettability, which is reflected in a drop of water fully spread within 1.44 s. Filtration experiments showed that the blended nanofiber membranes have ultrahigh flux and low irreversible fouling ratio. In general, this work enhances the possibility of hydrophilic modification of hydrophobic PVDF membranes.

show abstract

Novel hydrophobic polyvinyl alcohol–formaldehyde foams for organic solvents absorption and effective separation

Cited by 58 publications

References 55 publications

Organic–inorganic hybridization for the synthesis of robust in situ hydrophobic polypropylsilsesquioxane aerogels with fast oil absorption properties

Organic–inorganic hybridization for the synthesis of robust in situ hydrophobic polypropylsilsesquioxane aerogels with fast oil absorption properties

Modification of Nanofiber Support Layer for Thin Film Composite Forward Osmosis Membranes via Layer-By-Layer Polyelectrolyte Deposition

Super‐hydrophilic electrospun PVDF/PVA‐blended nanofiber membrane for microfiltration with ultrahigh water flux

Contact Info

Product

Resources

About