光催化
罗丹明B
光化学
降级(电信)
亚甲蓝
辐照
吸附
聚苯胺
化学工程
材料科学
紫外线
可见光谱
紫外线
激进的
光降解
化学
锐钛矿
二氧化钛
甲基橙
催化作用
复合数
傅里叶变换红外光谱
光电子学
聚合
有机化学
聚合物
复合材料
物理
核物理学
作者
Hao Zhang,Ruilong Zong,Jincai Zhao,Yongfa Zhu
摘要
The dramatic visible light photocatalytic activity was obtained for the degradation of Methylene Blue (MB) and Rhodamine B (RhB) under visible light irradiation (λ > 450 nm) after TiO2 photocatalysts were modified with monolayer dispersed polyaniline (PANI ) via a facile chemisorption approach. Under visible light irradiation, PANI generated π−π* transition, delivering the excited electrons into the conduction band of TiO2, and then the electrons transferred to an adsorbed electron acceptor to yield oxygenous radicals to degrade pollutants. Also, the ultraviolet photocatalytic performance was enhanced to about two times compared with that of P-25 TiO2 photocatalyst. The high photocatalytic activity came from the synergetic effect between PANI and TiO2, which promoted the migration efficiency of photogenerated carriers on the interface of PANI and TiO2. Under ultraviolet light irradiation, photoinduced holes in TiO2 valence band could transfer into HOMO orbital of PANI and then emigrate to the photocatalyst surface and oxidize the adsorbed contaminants directly. The optimum synergetic effect was found at a weight ratio of 3.0 wt % (PANI/TiO2).
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