偷看
光催化
吸附
材料科学
无纺布
化学工程
过程(计算)
化学
复合材料
催化作用
聚合物
有机化学
工程类
纤维
计算机科学
操作系统
作者
Wenli Bai,Esfandiar Pakdel,Qiming Wang,Bin Tang,Jinfeng Wang,Zhiqiang Chen,Yunhe Zhang,Christopher Hurren,Xungai Wang
标识
DOI:10.1016/j.jece.2022.108920
摘要
Studying the synergistic mechanisms of removing volatile organic compounds (VOCs) in an adsorption-photocatalytic oxidation process, remains a major challenge. This study explores the synergistic effects of SiO 2 nanoparticles and anatase TiO 2 nanocomposites in removing ethyl acetate, as a VOC test model, under solar irradiation in a photo-reactor. The physiochemical properties of the synthesized TiO 2 /SiO 2 nanocomposites (70/30 and 50/50, molar ratio) and pure TiO 2 nanoparticles were systematically characterized. It was found that the TiO 2 /SiO 2 nanocomposite with 30% SiO 2 showed the best synergistic adsorption and photocatalytic activity for the elimination of ethyl acetate among the tested samples. The integrated adsorption-photocatalytic mechanisms of TiO 2 /SiO 2 nanocomposites were revealed by inverse gas chromatography (IGC), electron paramagnetic resonance (EPR), photoluminescence (PL) techniques and kinetic analysis. Moreover, a facile ambient-temperature immobilization method was successfully developed to load photocatalysts onto poly-ether ether-ketone (PEEK) nonwoven. In addition, the photo-induced chemiluminescence (PICL) analysis confirmed that the TiO 2 /SiO 2 coating prevented the photodegradation of PEEK substrate under UVA radiation and improved its photostability. These results provided new understanding on designing highly adsorptive photocatalysts which are commercially applicable on filter materials for efficient VOC removal and air purification. • Inverse gas chromatography (IGC) was used to study the Lewis acid-base interaction for chemisorption of volatile organic compounds (VOCs) in a photocatalytic oxidation process. • A synergistic mechanism of the adsorptive and photocatalytic elimination of ethyl acetate was proposed. • An efficient ambient-temperature coating method was successfully developed to immobilize the photocatalysts onto substrate. • TiO 2 /SiO 2 photocatalysts coating improved the UV photostability of substrate.
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