光催化
材料科学
介孔材料
光降解
罗丹明B
可见光谱
化学工程
吸附
光化学
试剂
化学
催化作用
有机化学
光电子学
工程类
作者
Ting Wang,Yao Li,Wentao Wu,Yanling Zhang,Li–guang Wu,Huali Chen
标识
DOI:10.1016/j.apsusc.2020.148025
摘要
Aiming at exploring the relationship between photocatalysts with nanoscale chiral structures and their photocatalytic activity, we fabricated a novel chiral-arranged TiO2-SiO2 mesoporous material with high visible-light absorption and photocatalytic performance. Through a soft template route using a chiral surfactant and a co-structure-directing agent, the mesoporous materials with helical-spherical depositions could form in under low reaction temperature (≤10 °C). The asymmetric helical microstructures introduced numerous oxygen vacancies and Ti-N bonds into the materials, thus significantly promoting their visible-light response and photocatalytic performance. The chiral-arranged TiO2-SiO2 mesoporous material had high substantial visible-light-driven photocatalytic performance, including the degradation for rhodamine B in water and the production of hydrogen with a sacrificial reagent. The optimal removal rate of chiral-arranged TiO2-SiO2 materials for rhodamine B exceeded 97% irradiated by visible light. With increasing reaction temperature, the formation of TiO2 agglomerations could not deposit with the silica chiral frames and no chiral structure formed in the materials, thus exhibiting no visible-light response of TiO2-SiO2 materials.
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