Catalytic and Photocatalytic Nitrate Reduction Over Pd-Cu Loaded Over Hybrid Materials of Multi-Walled Carbon Nanotubes and TiO2

• Tipo: Artigo em Revista Científica Internacional
• Data: 2018

Autores

Cláudia G. Silva (Autor) FEUP; Manuel Fernando R. Pereira (Autor) FEUP; José J. M. Orfão (Autor) Outra; Joaquim L. Faria (Autor) FEUP; Olívia S. G. P. Soares (Autor) FEUP

Revista

Título: Frontiers in Chemistry

Vol. 6

Páginas: 1-10

ISSN: 2296-2646

Editora: FRONTIERS MEDIA SA

Indexação

ISI Web of Knowledge - 0 Citações

ISI Web of Science

Scopus - 5 Citações

Classificação Científica

CORDIS: Ciências Tecnológicas > Engenharia > Engenharia química

FOS: Ciências da engenharia e tecnologias > Engenharia química

Projetos Associados

IF/00514/2014/CP1249/CT0004 - Desafiando a síntese em química fina: uma nova abordagem utilizando fotocatalisadores isentos de metais

Outras Informações

ID Authenticus: P-00Q-176

DOI: 10.3389/fchem.2018.00632

Abstract (EN): TiO2 and carbon nanotube-TiO2 hybrid materials synthesized by sod-gel and loaded with 1 %Pd-1%Cu (%wt.) were tested in the catalytic and photocatalytic reduction of nitrate in water in the presence of CO2 (buffer) and H-2 (reducing agent). Characterization of the catalysts was performed by UV-Vis and fluorescence spectroscopy, X-ray diffraction, temperature programed reduction, N-2 adsorption, and electron microscopy. The presence of light produced a positive effect in the kinetics of nitrate removal. Higher selectivity toward nitrogen formation was observed under dark condition, while the photo-activated reactions showed higher selectivity for the production of ammonium. The hybrid catalyst containing 20 %wt. of carbon nanotubes shows the best compromise between activity and selectivity. A mechanism for the photocatalytic abatement of nitrate in water in the presence of the hybrid materials was proposed, based in the action of carbon nanotubes as light harvesters, dispersing media for TiO2 particles and as charge carrier facilitators.

Idioma: Inglês

Tipo (Avaliação Docente): Científica

Nº de páginas: 10