材料科学
光催化
化学工程
肖特基势垒
极化(电化学)
二氧化钛
金红石
浓差极化
纳米技术
膜
光电子学
复合材料
化学
工程类
物理化学
催化作用
二极管
生物化学
作者
Peng Zhang,Shijie Zhang,Dongyang Wan,Pengpeng Zhang,Zhenyi Zhang,Guosheng Shao
标识
DOI:10.1016/j.jhazmat.2020.122639
摘要
Atmospheric Particulate matter (PM) with small sizes has caused a serious air-pollution problem calling for high-performance PM-capture materials and promising remediation strategies. In this contribution, we propose a new idea to proactively capture PM and simultaneously in-situ convert the captured PM pollution over the flexible schottky-junctions nanofiber membrane (NFM) consisting of rutile TiO2 nanoparticles (NPs)-decorated electrospun carbon NFs. We also demonstrate that both the interfacial electron-transfer process at the TiO2/carbon schottky-junctions and the photo-excitation process at the surface of TiO2 NPs can induce polarization fields in the TiO2/carbon NFM due to the difference of the space-charge distribution. These multilevel polarization fields can drive the long-range electrostatic force to enhance the proactive PM-capture ability of the NFM. As such, the TiO2/carbon NFM exhibited a satisfactory quality factor (0.11 Pa-1) for balancing the PM2.5-filtration efficiency (99.92 %) and the pressure drop (only 63 Pa). More importantly, upon UV-vis-light irradiation, 92.98 % of the ultrafine PM0.3 was removed over this TiO2/carbon NFM. Furthermore, the as-captured PM on the NFM could be photocatalytically decomposed by the photoactive-component of TiO2 NPs, during which some of the carbonaceous PM was converted into the fuels of such CO and CH4 through a multi-step photoreaction.
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