Journal
CHEMICAL ENGINEERING JOURNAL
Volume 382, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2019.122988
Keywords
Dopamine; gamma-FeOOH; Superhydrophobic; Flame Retardant; Environmentally friendly
Categories
Funding
- National Nature Science Foundation of China [51973144, 51741301]
- Major Program of Natural Science Foundation of the Jiangsu Higher Education Institutions [18KJA540002]
- Priority Academic Program Development (PAPD) of Jiangsu Higher Education Institutions for Textile Engineering in Soochow University
- Nantong Science and Technology program [GY12017016]
- China Scholarship Council (CSC) [201806920088]
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Due to the increasing pollution produced by the textile industry, environmentally friendly methods are becoming extremely important. In this work, silk fabrics (SFs) were modified with a series of natural polyphenols under the catalysis of laccase and then reacted with a ferrous solution to construct fabric surfaces with a micro-nano structure. Among the modified SFs, dopamine-Fe-modified silk fabric (PDA-Fe-SF) had an outstanding hydrophobicity and was screened as a research model. The preparation process was simple and eco-friendly, as it did not use toxic organic solvents, fluorine-containing substances, or halogen-containing and phosphorus-containing flame retardants. The structure and properties of the modified silk fabrics were characterized by scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS), a vertical combustion test and so on. The results showed the surface of the PDA-Fe-SF was coated with dense and uniform needle-like gamma-FeOOH nanorods and had a high contact angle (CA) of up to 165 degrees and good self-cleaning performance. The damaged carbon length of the burned fabric was only 10.5 cm in the vertical combustion test, and the UPF value of the PDA-Fe-SF can reach 72, which classifies this material in the Excellent UV protection level. The modified silk fabrics had good mechanical properties and durability. Through the electrostatic potential analyses of polyphenols and their oligomers, the FeOOH formation mechanism of the surface morphology could reveal that the differences in the polymerization types, structures and water solubilities of the polyphenol polymers would affect the way in which the polymers deposit and the amount of deposition that occurs, and the number of coordination sites for Fe2+ and the resulting various surface morphologies on the silk fabric could be determined.
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