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Author(s): Cláudia G. Silva
Maria J. Sampaio
Sónia A. C. Carabineiro
João W. L. Oliveira
Daniel L. Baptista
Revathi Bacsa
Bruno F. Machado
Philippe Serp
José L. Figueiredo
Adrián M. T. Silva
Joaquim L. Faria
Title: Developing highly active photocatalysts: Gold-loaded ZnO for solar phenol oxidation
Issue Date: 2014
Abstract: Gold nanoparticles were loaded on ZnO materials by a double impregnation method. Materials were characterized by spectroscopic, microscopic and N-2 adsorption techniques, and tested on the photocatalytic oxidation of phenol in aqueous solutions, under simulated solar light. Compared with bare ZnO, the Auloaded catalysts presented increased activity, which has been evaluated in terms of the pseudo-first-order kinetic constant (k(app)) and phenol mineralization. The best activities were obtained with the Au-loaded ZnO samples produced by chemical vapor deposition, and by thermal decomposition of zinc acetate (k(app) = 5.6 min(-1) mg(Au)(-1) for both materials), achieving mineralizations of 92% and 82%, respectively. Depending on the ZnO material, on the gold nanoparticle dimensions and on the irradiation wavelength used, gold particles may act as electron sinks or light harvesters. Selective trapping of photogenerated holes and radicals by selective scavengers showed that holes are crucial, but free radicals do also participate on phenol's photodegradation pathway.
Subject: Catálise heterogénea, Engenharia química
Heterogeneous catalysis, Chemical engineering
Scientific areas: Ciências da engenharia e tecnologias::Engenharia química
Engineering and technology::Chemical engineering
Related Information: info:eu-repo/grantAgreement/FCT - Fundação para a Ciência e Tecnologia/Projetos Estratégicos/PEst-C/EQB/LA0020/2013/PROJECTO ESTRATÉGICO - LA 20 - 2013-2014/LA 20
Document Type: Artigo em Revista Científica Internacional
Rights: restrictedAccess
Appears in Collections:FEUP - Artigo em Revista Científica Internacional

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