Photocatalytic disproportionation of nitrite to dinitrogen and nitrate in an aqueous suspension of metal-loaded titanium(iv) oxidenanoparticles

文献情報

出版日 2010-10-25

DOI 10.1039/C0CP00794C

インパクトファクター 3.676

著者

Hiroshi Kominami, Hitoshi Gekko, Keiji Hashimoto

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要旨

Photocatalytic reaction of a nitrite ion in aqueous suspensions of bare and metal-loaded TiO2 particles was examined without electron and hole scavengers under irradiation of UV light. In the bare TiO2 system, disproportionation of NO2− to N2 (or N2O) and NO3− with nitrogen balance (NB) and redox balance (ROB) close to unity within experimental errors was observed, although the reaction was slow. Palladium (Pd)-loaded TiO2 particles exhibited an extraordinarily large rate of disproportionation of NO2− in their aqueous suspension, i.e. NO2− was almost completely converted to N2 (or N2O) and NO3− even after only 3 h of photoirradiation, both the values of NB and ROB being close to unity. This result suggests that Pd loaded on TiO2 particles acted as storage sites for photogenerated electrons and effectively transferred the electrons to NO2− and, therefore, that the reduction process in the photocatalytic disproportionation of NO2− was accelerated by Pd loaded on TiO2. Effects of the amount of Pd and pH of the suspension on the reaction rate were also examined.

掲載誌

Physical Chemistry Chemical Physics

CiteScore: 5.5

自己引用率: 10.3%

年間論文数: 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.

Photocatalytic disproportionation of nitrite to dinitrogen and nitrate in an aqueous suspension of metal-loaded titanium(iv) oxidenanoparticles

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