Surface hydrophobic modification of polymers with fluorodiazomethanes

Yang, Pengfei; Moloney, Mark G.; Zhang, Fei; Ji, Wei

doi:10.1016/j.matlet.2017.09.008

Cited by 18 publications

(8 citation statements)

References 34 publications

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“…Interestingly, this seems to be the case despite the diffusion and dispersion coefficients staying within one order of magnitude between the filters, suggesting that degradation in the filters is governed mainly by microscopic properties. Similar results have been reported for biofilters superficially treated with different hydrophobic molecules, such as fluorodiazomethanes, trimethylchlorosilane, and hexamethyldisilazane [ 63 , 64 , 65 ]. This property is advantageous for long-term operation as it potentially helps in avoiding the early clogging of the biofilters by the presence of suspended particulate material [ 66 ].…”

Section: Discussionsupporting

confidence: 85%

Congo Red Decolorization Using Textile Filters and Laccase-Based Nanocomposites in Continuous Flow Bioreactors

et al. 2020

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Removal of azo and diazo dye content from textile industry wastewaters is crucial due to their environmental impact. Here, we report on the use of the fungal laccase from Pycnoporus sanguineus CS43 immobilized on silica nanoparticles and entrapped in textile-based filters for the degradation of Congo Red. Laccase immobilization and synthesis of the nanocomposites were carried out by two different methods, one in the presence of acetone and the second using water as solvent. This led to a change in the hydrophobicity of the obtained biofilters. Successful preparation of the nanocomposites was confirmed via FTIR spectroscopy. Changes in the secondary structure of the enzyme were inspected through the second derivative of the FTIR spectra. Six different types of filter were fabricated and tested in a continuous flow bioreactor in terms of their decolorization capabilities of Congo Red. The results indicate removal efficiencies that approached 40% for enzymes immobilized on the more hydrophobic supports. Backscattered electron (BSE) images of the different filters were obtained before and after the decolorization process. Percentage of decolorization and activity loss were determined as a function of time until a plateau in decolorization activity was reached. Experimental data was used to recreate the decolorization process in COMSOL Multiphysics® (Stockholm, Sweden). These simulations were used to determine the proper combination of parameters to maximize decolorization. Our findings suggest that the treatment of textile-based filters with immobilized laccase in conjunction with hydrophobic nanocomposites provides a suitable avenue to achieve more efficient laccase dye decolorization (39%) than that obtained with similar filters treated only with free laccase (8%). Filters treated with silica-based nanocomposites and immobilized laccases showed an increase in their decolorization capability, probably due to changes in their wetting phenomena.

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Section: Discussionsupporting

confidence: 85%

Congo Red Decolorization Using Textile Filters and Laccase-Based Nanocomposites in Continuous Flow Bioreactors

et al. 2020

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“…This demonstrated that diazomethane could be easily converted into carbenes under UV light and efficiently reacted with gelatins to introduce perfluoroalkyl groups onto the surface. In addition, different reactivities between diazomethane 5 and reported fluoro-diazomethanes are noteworthy, which might be attributed to the separation of the diazo group and the perfluoroalkyl group.…”

Section: Resultsmentioning

confidence: 99%

Electrospun Gelatin Membrane Cross-Linked by a Bis(diarylcarbene) for Oil/Water Separation: A New Strategy To Prepare Porous Organic Polymers

Yang

Moloney

et al. 2018

ACS Omega

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Porous organic polymers (POPs) as absorbing materials have attracted increasing attention. Here, we report a new approach to prepare these polymers for selective oil absorption from oil/water mixtures. Perfluoroalkylbis(diaryldiazomethane) was synthesized and used to modify the surface of an electrospun gelatin membrane by a carbene insertion reaction, not only to immobilize the porous network morphology by cross-linking but also to introduce perfluoroalkyl groups for oil/water separation. The membrane was characterized to show its surface and bulk properties, as well as its performance for absorption capacity, selectivity, and renewability. This approach offers a new horizon in the preparation of POPs for oil/water separation.

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“…Therefore, the modified SiO 2 nanoparticles 7 was obtained by the attachment of perfluoroalkyl groups onto the surface. This was proved to be an convenient approach to chemically introduce organic groups onto inorganic materials, such as SiO 2 , TiO 2 , carbon black, and graphene …”

Section: Resultsmentioning

confidence: 99%

Self‐healing polyurethane nanocomposite films with recoverable surface hydrophobicity

Yang

Zhang

et al. 2018

J of Applied Polymer Sci

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It is a great challenge for self‐healing materials to recover their mechanical property and surface hydrophobicity simultaneously after being damaged severely, such as deep and wide surface scratches. In this work, a series of hydrophobic films were prepared by mixing perfluoroalkyl‐loaded SiO2 nanoparticles with thermally self‐healing polyurethane. The Diels–Alder reaction of furan groups with bismaleimides endowed the polyurethane with self‐healing property, and the introduction of perfluoroalkyl chains gave surface hydrophobicity. When being heated, the low surface energy compounds could gradually move onto the surface to make the surface hydrophobicity recoverable. The self‐healing mechanical property and recoverable hydrophobicity would improve the durability and expand the application of polyurethane nanocomposites as self‐cleaning and self‐healing coatings/surfaces. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018, 135, 46421.

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Surface hydrophobic modification of polymers with fluorodiazomethanes

Cited by 18 publications

References 34 publications

Congo Red Decolorization Using Textile Filters and Laccase-Based Nanocomposites in Continuous Flow Bioreactors

Congo Red Decolorization Using Textile Filters and Laccase-Based Nanocomposites in Continuous Flow Bioreactors

Electrospun Gelatin Membrane Cross-Linked by a Bis(diarylcarbene) for Oil/Water Separation: A New Strategy To Prepare Porous Organic Polymers

Self‐healing polyurethane nanocomposite films with recoverable surface hydrophobicity

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