Efficient visible light photocatalytic oxidation of NO in air with band-gap tailored (BiO)2CO3-BiOI solid solutions

被引：0
|
作者：
Ou, Meiya [1 ]
Dong, Fan [1 ]
Zhang, Wei [2 ]
Wu, Zhongbiao [3 ]
机构：
[1] Ou, Meiya
[2] Dong, Fan
[3] Zhang, Wei
[4] Wu, Zhongbiao
来源：
Dong, F. (dfctbu@126.com) | 1600年 / Elsevier B.V., Netherlands卷 / 255期
关键词：
In order to develop efficient visible light photocatalysts for air purification; three dimensional (3D) (BiO)2CO3/BiOI (BOC/BOI) solid solutions were synthesized by a template free method at room temperature. This environment benign route could avoid high temperature and reduce the production cost. The results indicated that the as-prepared hierarchical nanocomposites samples assembled with 2D nanosheets were solid solutions. The aggregation of nanosheets led to the formation of 3D hierarchical porous architecture. For the (BiO)2(CO3)x(I2)1-x solid solution with x=0.5; 0.75; 0.95; the samples have down-lowered valence band (VB) and up-lifted conduction band (CB) in contrast to (BiO)2CO3. Compared with (BiO)2CO3 (3.14eV); the (BiO)2(CO3)x(I2)1-x solid solution showed narrowed band gaps from 1.89 to 2.68eV which are suitable for visible light excitation. The 3D (BiO)2(CO3)x(I2)1-x solid solutions displayed efficient photocatalytic activity and high durability toward photo-oxidation of NO (600ppb) in air. The large surface areas; hierarchical structure; and tailed band-gap structure contributed to the efficient photocatalytic oxidation ability of (BiO)2(CO3)x(I2)1-x solid solution. As NO has very low solubility and NO2 has a large solubility in water. A high NO to NO2 conversion ratio is beneficial for NOx removal by aqueous absorption. The photo-oxidation products can be readily and inexpensively removed by alkaline aqueous absorption. This work could provide new insights into the design; synthesis and environmental application of hierarchical nanocomposites photocatalysts. © 2014 Elsevier B.V;
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页码：650 / 658
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