Characterization of UiO-67 Decoration onto UV-crosslinked-poly(vinyl alcohol) Nanofibes for Adsorption Application

Autor: Worapat Inprasit, Penwisa Pisitsak, Jarinphorn Pukkao, Thitirat Inprasit
Rok vydání: 2021
Předmět:
Zdroj: Fibers and Polymers. 23:58-67
ISSN: 1875-0052
1229-9197
Popis: The applications of poly(vinyl alcohol) for remediation of aqueous systems are limited by its solubility. UV crosslinking was initiated using TiO2 and ZnO as photo-catalysts and citric acid as cross-linker during electrospinning of poly(vinyl alcohol) nanofibers. The UiO-67 metal-organic framework was loaded for enhancing adsorption capability. The concentrations of TiO2, ZnO, and citric acid all affected both swelling and solubility. The optimal conditions for photo-crosslinking of poly(vinyl alcohol) nanofibers were 2 %wt of TiO2 and 7.5 %wt of citric acid. This provided insoluble continuous fibers of 60 to 120 nm with a smooth surface. The UiO-67 metal-organic framework was successfully synthesized with high purity using a modified sonochemical method which exposed the UiO-67 to ultrasonic waves for 30 min at room temperature. The synthesized UiO-67 exhibited a cubic close-packed structure. UiO-67 of up to 7 %wt was incorporated into the poly(vinyl alcohol), producing the crosslinked- poly(vinyl alcohol) composite nanofibers containing UiO-67. The composite nanofibers had a higher specific surface area and smaller pore size than the neat poly(vinyl alcohol) nanofibers. This could be due to UiO-67 incorporation producing micropores, which increased the surface area and enhanced phosphate removal.
Databáze: OpenAIRE
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