可见光响应 TiO2 用于挥发性有机化合物 (VOC) 的完全光催化分解及其通过热能的有效加速,Applied Catalysis B: Environment and Energy

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可见光响应 TiO2 用于挥发性有机化合物 (VOC) 的完全光催化分解及其通过热能的有效加速
Applied Catalysis B: Environment and Energy ( IF 20.2 ) Pub Date : 2024-01-17 , DOI: 10.1016/j.apcatb.2024.123745
Kosuke Imai , Takashi Fukushima , Hisayoshi Kobayashi , Shinya Higashimoto

已知二氧化钛 (TiO) 半导体在紫外光 (> 3.2 eV) 照射下通过带隙激发表现出光催化作用。 TiO 已被广泛研究以应对环境修复的迫切需求，例如挥发性有机化合物 (VOC) 的降解。在这项研究中，令人惊讶的是，TiO 在可见光照射 (2.3 eV <) 下表现出有效的反应活性，可将苯、甲苯和间二甲苯 (BTX) 等各种 VOC 完全降解为 CO。这是因为 TiO 上各种 VOC 的吸附导致形成界面表面复合物 (ISC)，在可见光区域提供微弱的光吸收。特别是，清楚地证明了甲苯光催化分解的表观量子产率与ISC的光吸收波长之间的相关性。通过密度泛函理论 (DFT) 模拟，阐明了可见光响应 TiO 的起源机制。此外，还研究了可见光响应 TiO2 光催化的热效应。研究发现，可见光能与其过量热能的结合显着增强了甲苯的降解活性。

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Visible-light responsive TiO2 for the complete photocatalytic decomposition of volatile organic compounds (VOCs) and its efficient acceleration by thermal energy

Titanium dioxide (TiO) semiconductors are known to exhibit photocatalysis by bandgap excitation upon UV-light ( > 3.2 eV) irradiation. TiO has been extensively investigated in the challenge to address the urgent need for environmental remediation such as the degradation of volatile organic compounds (VOCs). In this study, it was striking that the TiO exhibited effective reactivity for the complete degradation of various VOCs such as benzene, toluene and m-xylene (BTX) into CO under visible-light irradiation (2.3 eV <). This is because the adsorption of various VOCs on TiO results in the formation of an interfacial surface complex (ISC) that provides weak light absorption in the visible light region. In particular, the correlation between the apparent quantum yields in the photocatalytic decomposition of toluene and the light absorption wavelengths of the ISC was clearly demonstrated. By density functional theory (DFT) simulations, the mechanism for origin of the visible-light responsive TiO was clarified. Furthermore, thermal effects on the visible-light responsive TiO photocatalysis were investigated. It was found that the combination of visible light-energy and its excess thermal energy significantly enhanced activity for the degradation of toluene.

更新日期：2024-01-17

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