Behavior of superoxide radicals formed on TiO2 powder photocatalysts studied by a chemiluminescent probe method

文献信息

发布日期 2002-02-14
DOI 10.1039/B108441K
影响因子 3.676
作者

Yoshio Nosaka, Masatsugu Nakamura, Tsutomu Hirakawa


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摘要

A luminol chemiluminescence (CL) probe method was successfully applied to the investigation of the superoxide radical (O2−˙) formed on photoirradiated TiO2 powders. For several kinds of commercially available TiO2 photocatalysts and their calcined samples, the amount of O2−˙ produced at the steady state was measured and found to increase with the secondary particle size or the degree of aggregation. The decay of O2−˙ for the non-calcined samples was as long as several hundred seconds and obeyed second order kinetics, indicating that disproportionation is the main deactivation pathway. For some TiO2 photocatalysts, oxidative species such as OH˙ radicals are suggested to exist for 1 s after irradiation. On the other hand, reductive photoinduced electrons may remain for several seconds after irradiation since the decay of O2−˙ starts after a delay of more than 1 s. On calcination at temperatures up to 1173 K, O2−˙ decays by a mechanism other than disproportionation, suggesting the prolonged lifetime of an oxidative species that can react with O2−˙.

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来源期刊

Physical Chemistry Chemical Physics

Physical Chemistry Chemical Physics
CiteScore: 5.5
自引率: 10.3%
年发文量: 3036

Physical Chemistry Chemical Physics (PCCP) is an international journal co-owned by 19 physical chemistry and physics societies from around the world. This journal publishes original, cutting-edge research in physical chemistry, chemical physics and biophysical chemistry. To be suitable for publication in PCCP, articles must include significant innovation and/or insight into physical chemistry; this is the most important criterion that reviewers and Editors will judge against when evaluating submissions. The journal has a broad scope and welcomes contributions spanning experiment, theory, computation and data science. Topical coverage includes spectroscopy, dynamics, kinetics, statistical mechanics, thermodynamics, electrochemistry, catalysis, surface science, quantum mechanics, quantum computing and machine learning. Interdisciplinary research areas such as polymers and soft matter, materials, nanoscience, energy, surfaces/interfaces, and biophysical chemistry are welcomed if they demonstrate significant innovation and/or insight into physical chemistry. Joined experimental/theoretical studies are particularly appreciated when complementary and based on up-to-date approaches.

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