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Spatially confined growth of Bi2O4 into hierarchical TiO2 spheres for improved visible light photocatalytic activity
Journal of Materials Science ( IF 4.5 ) Pub Date : 2019-10-28 , DOI: 10.1007/s10853-019-04143-x
Cuiqing Zhang , Yaya Ma , Chengyu Li , Feng Qin , Changyuan Hu , Quanhong Hu , Shuwang Duo

Bi2O4 is a promising visible light responsive photocatalyst but its application is limited by the large particle size and fast recombination rate of charge carriers. Herein, the flower-like hierarchical TiO2 sphere with rich mesorpores and macropores was used as the framework for the space-confined growth of nanosized Bi2O4, creating enormous Bi2O4/TiO2 type II heterojunctions and enlarging the interfacial contract areas between Bi2O4 and TiO2. Benefitting from these outstanding features, the photocatalytic activity of Bi2O4/TiO2 heterojunction for the degradation of methyl orange is much higher than that of pure Bi2O4 under visible light. The greatly improved separation efficiency of charge carriers that derived from the heterojunction and the shortened transfer distance of photogenerated charges from interior to surface of nanoscaled Bi2O4 are responsible for the enhanced photocatalytic performance. In addition, radical capture experimental results imply that hole is the dominant reactive species for the degradation of methyl orange.

中文翻译:

Bi2O4 空间受限生长成分级 TiO2 球体以提高可见光光催化活性

Bi2O4 是一种很有前途的可见光响应光催化剂,但其应用受到载流子大粒径和快速复合速率的限制。在此,具有丰富中孔和大孔的花状分层 TiO2 球体被用作纳米尺寸 Bi2O4 空间受限生长的框架,产生了巨大的 Bi2O4/TiO2 II 型异质结,并扩大了 Bi2O4 和 TiO2 之间的界面收缩面积。得益于这些突出特点,Bi2O4/TiO2异质结在可见光下降解甲基橙的光催化活性远高于纯Bi2O4。源自异质结的电荷载流子的分离效率大大提高,并且光生电荷从纳米级 Bi2O4 内部到表面的转移距离缩短,是增强光催化性能的原因。此外,自由基捕获实验结果表明空穴是甲基橙降解的主要反应物质。
更新日期:2019-10-28
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