Piezo-photocatalytic flexible PAN/TiO2 composite nanofibers for environmental remediation
Piezo-photocatalytic flexible PAN/TiO2 composite nanofibers for environmental remediation
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DOI：
10.1016/j.scitotenv.2022.153790
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发表时间：
2022-02-16
影响因子：
9.8
通讯作者：
Myung, Nosang Vincent
中科院分区：
文献类型：
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作者：
Ding, Deng;Li, Zhiwei;Myung, Nosang Vincent
机械振动和太阳能在环境中无处不在。在此，我们报告的协同增强的氧化，同时收获太阳能和机械振动，通过灵活的压电和光催化复合材料的反射。采用单罐静电纺丝法制备了聚丙烯腈（PAN）/TiO 2纳米纤维，纤维直径可调，负载密度可调。通过将光催化TiO 2结合到柔性压电PAN陶瓷载体中，在机械变形下产生的压电场促进光生电子和空穴的分离，从而加速污染物的氧化。结果表明，PAN/TiO 2纳米纤维在环境振动诱导的压电效应下，对罗丹明B（RhB）的光催化降解活性有显著的增强作用，最大增强因子可达2.5.机械振动增强PAN/TiO 2纳米纤维光催化活性的机理是PAN纳米纤维的压电效应，能有效促进TiO 2纳米颗粒中光生电子和空穴的分离。我们认为提高MAT催化活性的方法可以充分利用聚合物的性质和天然能量，并可以推广到其他聚合物/半导体复合体系。
Mechanical vibrations and solar energy are ubiquitous in the environment. Hereon, we report the synergic enhancement of the oxidation by simultaneously harvesting solar and mechanical vibrations through flexible piezo and photocatalytic composite nanofiber mats. Surface enriched titanium dioxide nanoparticles incorporated in polyacrylonitrile (PAN/TiO2) nanofibers were synthesized using a single pot electrospinning process with well-defined fiber diameters with widely tunable loading density. By incorporating photocatalytic TiO2 in flexible piezoelectric PAN nanofiber support, piezoelectric fields generated under the mechanical deformation promote the separation of the photogenerated electrons and holes to accelerate oxidation of pollutants. Our results demonstrated that the catalytic activity of PAN/TiO2 nanofibers in photodegradation of Rhodamine B (RhB) can be greatly enhanced by environmental vibration-induced piezoelectricity of PAN nanofibers, with a maximum enhancement factor of similar to 2.5. The working mechanism for the enhanced photocatalytic activity of PAN/TiO2 nanofibers by the mechanical vibrations were attributed to the piezoelectric effect of PAN nanofibers, which could efficiently promote the separation of the photogenerated electrons and holes in the TiO2 nanoparticles. We believe the approach to enhancing the catalytic activity of mat can make full use of the polymer properties and natural energy, and it also can be extended to other composite polymer/semiconductor systems.