光催化
光化学
罗丹明B
激进的
过氧化氢
羟基自由基
可见光谱
动力学
光降解
吸附
化学
润湿
材料科学
化学工程
催化作用
有机化学
物理
光电子学
量子力学
工程类
复合材料
作者
Xi Chen,Xia Sheng,Hang Zhou,Zhiping Liu,Minmin Xu,Xinjian Feng
出处
期刊:Small
[Wiley]
日期:2024-01-04
标识
DOI:10.1002/smll.202310128
摘要
Abstract Hydroxyl radical ( • OH) with strong oxidation capability is one of the most important reactive oxygen species. The generation of • OH from superoxide radicals ( • O 2 − ) is an important process in visible‐light‐driven photocatalysis, but the conversion generally suffers from slow reaction kinetics. Here, a hydrophobicity promoted efficient • OH generation in a visible‐light‐driven semiconductor‐mediated photodegradation reaction is reported. Hydrophobic TiO 2 that is synthesized by modifying the TiO 2 surface with a thin polydimethylsiloxane (PDMS) layer and rhodamine B (RhB) are used as model semiconductors and dye molecules, respectively. The surface hydrophobicity resulted in the formation of a solid–liquid–air triphase interface microenvironment, which increased the local concentration of O 2 . In the meanwhile, the saturated adsorption quantity of RhB on hydrophobic TiO 2 is improved by five‐fold than that on untreated TiO 2 . These advantages increased the density of the conduction band photoelectrons and • O 2 − generation, and stimulated the conversion of • O 2 − to • OH. This consequently not only increased the kinetics of the photocatalytic reaction by an order of magnitude, but also altered the oxidation route from conventional decolorization to mineralization. This study highlights the importance of surface wettability modulation in boosting • OH generation in visible‐light‐driven photocatalysis.
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