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Characterization of UiO-67 Decoration onto UV-crosslinked-poly(vinyl alcohol) Nanofibes for Adsorption Application
Fibers and Polymers ( IF 2.2 ) Pub Date : 2021-08-10 , DOI: 10.1007/s12221-021-1417-8
Jarinphorn Pukkao 1 , Penwisa Pisitsak 1 , Thitirat Inprasit 1 , Worapat Inprasit 2
Affiliation  

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.



中文翻译:

用于吸附应用的 UV 交联聚(乙烯醇)纳米纤维上 UiO-67 装饰的表征

聚乙烯醇在修复水性体系中的应用受到其溶解性的限制。在聚乙烯醇纳米纤维的静电纺丝过程中,使用 TiO 2和 ZnO 作为光催化剂,使用柠檬酸作为交联剂引发 UV 交联。加载 UiO-67 金属有机骨架以增强吸附能力。TiO 2、ZnO 和柠檬酸的浓度都影响溶胀和溶解度。聚乙烯醇纳米纤维光交联的最佳条件为 2 %wt TiO 2和 7.5%wt 的柠檬酸。这提供了具有光滑表面的 60 至 120 nm 的不溶性连续纤维。使用改进的声化学方法成功合成了高纯度的 UiO-67 金属有机骨架,该方法将 UiO-67 在室温下暴露于超声波中 30 分钟。合成的 UiO-67 呈现立方密堆积结构。将高达 7%wt 的 UiO-67 掺入到聚(乙烯醇)中,产生含有 UiO-67 的交联聚(乙烯醇)复合纳米纤维。复合纳米纤维比纯聚乙烯醇纳米纤维具有更高的比表面积和更小的孔径。这可能是由于 UiO-67 掺入产生了微孔,从而增加了表面积并增强了磷酸盐去除。

更新日期:2021-08-10
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