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

• Type: Article in International Scientific Journal
• Date: 2018

Authors

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

Journal

Title: Frontiers in Chemistry

Vol. 6

Pages: 1-10

ISSN: 2296-2646

Publisher: Frontiers Media

Indexing

ISI Web of Knowledge - 0 Citations

ISI Web of Science

Scopus - 5 Citations

Scientific classification

CORDIS: Technological sciences > Engineering > Chemical engineering

FOS: Engineering and technology > Chemical engineering

Associated Projects

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

AIProcMat@N2020 - Advanced Industrial Processes and Materials for a Sustainable North Region of Portugal2020

Other information

Authenticus ID: 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.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 10