Fluid eddy induced piezo-promoted photodegradation of organic dye pollutants in wastewater on ZnO nanorod arrays/3D Ni foam
Fluid eddy induced piezo-promoted photodegradation of organic dye pollutants in wastewater on ZnO nanorod arrays/3D Ni foam
复制标题
ZnO 纳米棒阵列/3D Ni 泡沫上流体涡流诱导压电促进废水中有机染料污染物的光降解
DOI：
10.1016/j.mattod.2017.08.027
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发表时间：
2017-11-01
期刊：
影响因子：
24.2
通讯作者：
Wang, Zhong Lin
中科院分区：
文献类型：
--
作者：
Chen, Xiangyu;Liu, Longfei;Wang, Zhong Lin
在水热条件下合成了一种在三维Ni泡沫上垂直生长的ZnO纳米棒纳米复合材料，该材料具有压电和光催化双重功能。当溶液被磁旋转搅拌时，在独特的三维网状大孔结构内产生流体涡流，使ZnO纳米棒变形产生压电场。同时，紫外光照射ZnO半导体产生光电子和空穴，开始光催化降解废水中的有机染料污染物。压电偏置电压促进了光电子和空穴的分离，从而抑制了它们的复合，从而提高了量子效率（超过5倍）。由于压电场的增强，搅拌速率的提高提高了光催化活性。
A novel nanocomposite with ZnO nanorod arrays vertically growing on the three-dimensional (3D) Ni foam has been synthesized under hydrothermal conditions, which displays both the piezoelectric and photocatalytic functions. When the solution is stirred by magnetic rotation, fluid eddies are produced within the unique macroporous structure in 3D network, causing deformation of ZnO nanorod to generate piezoelectric field. Meanwhile, UV light irradiation on ZnO semiconductor generates photoelectrons and holes, followed by starting photocatalytic degradation of organic dye pollutants in wastewater. The piezo-induced bias voltage promotes the separation of photoelectrons and holes and thus can inhibit their recombination, leading to the enhanced quantum efficiency (more than 5 times). The photocatalytic activity increased by increasing the stirring rate owing to the enhanced piezoelectric field.