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Issue 21, 2018
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Particularities of photocatalysis and formation of reactive oxygen species on insulators and semiconductors: cases of SiO2, TiO2 and their composite SiO2–TiO2

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Abstract

Highly defected tubular SiO2 is found to outperform the activity of TiO2-P25 and the SiO2–TiO2 composite in photocatalytic H2 generation from methanol–water solution under simulated solar light AM 1.5. The enhanced performances of SiO2 come from the particularities of the reaction mechanism and ROS (reactive oxygen species) generation. The SiO2 exposed to light generates solely 1O2 (singlet oxygen). The TiO2-P25 produces uniquely large quantities of ˙OH radicals whereas the formation of O2 is evidenced only over SiO2–TiO2, along with small amounts of ˙OH. The TiO2 works as a photocatalyst by intermediation of ˙OH radicals. In contrast, the organic substrate is activated on the surface of SiO2 by the intra-band gap, isolated, surface quantum defects. Distinct reaction mechanisms, involving the participation of photogenerated charges and ROS, are proposed. The material-related ROS production can be of great practical importance in fields such as biology (germ inactivation), medicine (photodynamic therapy by 1O2), and synthesis of oxygenated organic compounds of great added value.

Graphical abstract: Particularities of photocatalysis and formation of reactive oxygen species on insulators and semiconductors: cases of SiO2, TiO2 and their composite SiO2–TiO2

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Publication details

The article was received on 16 May 2018, accepted on 27 Sep 2018 and first published on 28 Sep 2018


Article type: Paper
DOI: 10.1039/C8CY00991K
Citation: Catal. Sci. Technol., 2018,8, 5657-5668
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    Particularities of photocatalysis and formation of reactive oxygen species on insulators and semiconductors: cases of SiO2, TiO2 and their composite SiO2–TiO2

    C. Anastasescu, C. Negrila, D. G. Angelescu, I. Atkinson, M. Anastasescu, N. Spataru, M. Zaharescu and I. Balint, Catal. Sci. Technol., 2018, 8, 5657
    DOI: 10.1039/C8CY00991K

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