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Improved Visible Photocatalytic Activity on Titania Modified with −O–Pd–Cl Species Assisted by Oxidative Addition Reaction of Pd0
- Yang, Yajun, Yu, Yanlong, Zhang, Chunling, Wang, Jianhui, Cao, Yaan
- The Journal of Physical Chemistry C 2017 v.121 no.1 pp. 375-380
- cross-coupling reactions, electrons, free radicals, irradiation, palladium, photocatalysis, physical chemistry, titanium dioxide
- We introduce the idea of Pd catalysis used in cross-coupling reactions into photocatalysis. The −O–Pd–Cl surface species modified on nanoscale TiO₂ can remarkably enhance the photocatalytic activity under visible-light irradiation in the degradation of 4-bromophenol. It is revealed that the catalytically active Pd⁰ is in situ generated by the reduction of photogenerated electrons from TiO₂. The −O–Pd⁰–Cl species can react with 4-bromophenol to form hydroxyphenyl radicals via an oxidative addition reaction. The photocatalytic mechanism assisted by the oxidative addition reaction on −O–Pd–Cl species is also demonstrated. We were hence able to rationally tailor the coordination environment of Pd on the TiO₂ surface to obtain high photocatalytic activity and selectivity.