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Tunable selectivity of radical generation over TiO2 for photocatalysis

journal contribution
posted on 2023-12-06, 05:01 authored by C Tao, Q Jia, B Han, Z Ma
The realization of controllable radical generation through structural modification of photocatalyst is a challenging goal and is an important strategy for environmental remediation and noncomplete and selective photo-oxidation. Here, we control structural composition of TiO2 through crystalline modification and use photocatalytic dye degradation as a model system to investigate photocatalytic details. Importantly, modified TiO2 materials exhibit tunable mechanism pathway towards photocatalytic decomposing methylene blue (MB) monitored by radical trapping experiments. The anatase-rich TiO2 heterojunction shows preferential hole-mediated decomposition pathway in comparison with superoxide and hydroxyl radicals. In contrast, increasing ratio of rutile in TiO2 favors superoxide-facilitated MB decomposition over hole. The surface chemistry of specific surface atomic configuration is a key factor in tuning the capability of oxygen reduction and hole trapping, resulting in photocatalytic selectivity of radical generation towards photo-oxidation.

History

Journal

Chemical Engineering Science

Volume

214

Article number

ARTN 115438

Location

Amsterdam, The Netherlands

ISSN

0009-2509

eISSN

1873-4405

Language

English

Publication classification

C1.1 Refereed article in a scholarly journal

Publisher

PERGAMON-ELSEVIER SCIENCE LTD