Improved Visible Photocatalytic Activity on Titania Modified with −O–Pd–Cl Species Assisted by Oxidative Addition Reaction of Pd0

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• 作者：Yajun Yang ; Yanlong Yu ; Chunling Zhang ; Jianhui Wang ; Yaan Cao
• 刊名：Journal of Physical Chemistry C
• 出版年：2017
• 出版时间：January 12, 2017
• 年：2017
• 卷：121
• 期：1
• 页码：375-380
• 全文大小：399K
• ISSN：1932-7455

文摘

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.