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Author(s): Olívia Soares
Fernando Pereira
José Órfão
Joaquim Luís Faria
Cláudia Silva
Title: Photocatalytic nitrate reduction over Pd-Cu/TiO2
Issue Date: 2014
Abstract: The extension of photocatalytic nitrate reduction in water by a 1%Pd-1%Cu (%wt) catalyst supported on TiO2 was evaluated under different reaction conditions. A series of electron sacrificial donors such as formic acid, oxalic acid, ethanol, methanol, and humic acid were used for inhibiting the mechanism of electron/hole recombination on the semiconductor by hole scavenging. In addition, the roles of H-2 as reducing agent and CO2 as buffer are also discussed. The photocatalytic process is found to be more selective towards nitrogen than the dark catalytic process. Hole scavengers, or reducing H-2 increase significantly the photocatalytic reduction of nitrate. Complete (100%) conversion was obtained when both H-2 and CO2 were used as reducing and buffer agent, respectively. Among the hole scavengers tested, 0.08 M formic acid solution represents the best compromise between nitrate conversion (84%) and nitrogen selectivity (83%).
Subject: Química, Engenharia química
Chemistry, 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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