This study aimed to increase the photocatalytic efficiency and durability of functional fabrics coated with TiO2/SiO2 nanoparticles. Tetrabutyl titanate and tetraethyl orthosilicate were used as precursor and ultrasonic irradiation was utilized as a tool for synthesis of TiO2/SiO2 in low temperature and loading nanoparticles onto the polyester-cotton fabric. The multifunctionality of such nanocomposite material was evaluated by analyzing its hydrophilicity, photocatalytic, and antibacterial activities. The hydrophilicity and photocatalytic activity were analyzed based on water droplet contact angle measurements and removal of methylene blue stain under UV, respectively. On the other hand, antibacterial activities were examined against the Gram-positive S. aureus and the Gram-negative E. Coli. TiO2/SiO2-coated fabrics exhibited outstanding self-cleaning, antibacterial, and superhydrophilic properties. Moreover, particle size analysis, X-ray photoelectron spectroscopy, Fourier-transform infrared spectroscopy, and UV–Visible spectrophotometry confirmed that TiO2/SiO2 nanoparticles produced higher photocatalytic activities on the treated fabrics than pure TiO2 nanoparticles. Furthermore, the self-cleaning properties remained after 30 launderings, indicating excellent washing durability. Therefore, this process had no significant negative effect on the wearability including tensile strength, whiteness index, ventilation property, and surface roughness of sonotreated fabrics.
The direct transition-metal-catalyzed addition of C–H bonds to unsaturated C=X (X=C, O, and N) bonds via C–H bond activation has been recognized as a powerful tool for the construction of C–C bonds (in terms of atom and step economy). Herein, the direct rhodium-catalyzed C–H bond addition of aromatic ketones to allylic alcohols and α,β-unsaturated ketones that affords β-aryl carbonyl compounds is described, in which a ketone carbonyl acts as a weakly coordinating directing group. It was found that the type of alkyl in aromatic ketones is crucial for the success of the reaction. This transformation provides a convenient and efficient methodology for the synthesis of 2-alkyl aromatic ketones in moderate-to-excellent yields.
Silver trifluoroacetate with dual functions is demonstrated for constructing phthalic anhydride in air via palladium-catalyzed oxidative carbonylative [4+1] annulation of aromatic acids. Mechanistic studies reveal that the reaction occurs through...
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