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

IF 20.2 1区化学 Q1 CHEMISTRY, PHYSICAL Applied Catalysis B: Environmental Pub Date : 2024-01-17 DOI:10.1016/j.apcatb.2024.123745

Kosuke Imai, Takashi Fukushima, Hisayoshi Kobayashi, Shinya Higashimoto

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Abstract

Titanium dioxide (TiO₂) semiconductors are known to exhibit photocatalysis by bandgap excitation upon UV-light (hv > 3.2 eV) irradiation. TiO₂ 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 TiO₂ exhibited effective reactivity for the complete degradation of various VOCs such as benzene, toluene and m-xylene (BTX) into CO₂ under visible-light irradiation (2.3 eV < hv). This is because the adsorption of various VOCs on TiO₂ 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 TiO₂ was clarified. Furthermore, thermal effects on the visible-light responsive TiO₂ 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.

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用于完全光催化分解挥发性有机化合物 (VOC) 的可见光响应型二氧化钛及其热能的高效加速作用

众所周知，二氧化钛（TiO2）半导体在紫外光（hv > 3.2 eV）照射下可通过带隙激发产生光催化作用。为了解决环境修复（如降解挥发性有机化合物）的迫切需求，TiO2 已被广泛研究。在这项研究中，令人惊讶的是，在可见光（2.3 eV <hv）照射下，TiO2 表现出有效的反应活性，可将各种挥发性有机化合物（如苯、甲苯和间二甲苯 (BTX)）完全降解为 CO2。这是因为各种挥发性有机化合物在 TiO2 上的吸附会形成界面表面复合物 (ISC)，从而在可见光区域提供微弱的光吸收。其中，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得到了清楚的证明。通过密度泛函理论（DFT）模拟，阐明了可见光响应 TiO2 的起源机制。此外，还研究了热效应对可见光响应 TiO2 光催化的影响。研究发现，结合可见光能及其过剩热能可显著提高降解甲苯的活性。

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来源期刊

Applied Catalysis B: Environmental 环境科学-工程：化工

CiteScore

38.60

自引率

6.30%

发文量

1117

审稿时长

24 days

期刊介绍： Applied Catalysis B: Environment and Energy (formerly Applied Catalysis B: Environmental) is a journal that focuses on the transition towards cleaner and more sustainable energy sources. The journal's publications cover a wide range of topics, including: 1.Catalytic elimination of environmental pollutants such as nitrogen oxides, carbon monoxide, sulfur compounds, chlorinated and other organic compounds, and soot emitted from stationary or mobile sources. 2.Basic understanding of catalysts used in environmental pollution abatement, particularly in industrial processes. 3.All aspects of preparation, characterization, activation, deactivation, and regeneration of novel and commercially applicable environmental catalysts. 4.New catalytic routes and processes for the production of clean energy, such as hydrogen generation via catalytic fuel processing, and new catalysts and electrocatalysts for fuel cells. 5.Catalytic reactions that convert wastes into useful products. 6.Clean manufacturing techniques that replace toxic chemicals with environmentally friendly catalysts. 7.Scientific aspects of photocatalytic processes and a basic understanding of photocatalysts as applied to environmental problems. 8.New catalytic combustion technologies and catalysts. 9.New catalytic non-enzymatic transformations of biomass components. The journal is abstracted and indexed in API Abstracts, Research Alert, Chemical Abstracts, Web of Science, Theoretical Chemical Engineering Abstracts, Engineering, Technology & Applied Sciences, and others.