Heterogeneous Fenton-Like Degradation of p-Nitrophenol over Tailored Carbon-Based Materials

• Type: Article in International Scientific Journal
• Date: 2019

Authors

Olívia S. G. P. Soares (Author) FEUP; Carmen S. D. Rodrigues (Author) FEUP; Luís M. Madeira (Author) FEUP; Manuel Fernando R. Pereira (Author) FEUP

Journal

Title: Catalysts

Vol. 9 No. 3

Pages: 1-18

ISSN: 2073-4344

Publisher: MDPI

Indexing

ISI Web of Knowledge - 2 Citations

Scopus - 15 Citations

INSPEC

Associated Projects

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

LEPABE - Projeto Estratégico do LEPABE - Laboratório de Engenharia de Processos, Ambiente, Biotecnologia e Energia

Other information

Authenticus ID: P-00Q-BH8

DOI: 10.3390/catal9030258

Abstract (EN): Activated carbon (AC), carbon xerogel (XG), and carbon nanotubes (CNT), with and without N-functionalities, were prepared. Catalysts were obtained after impregnation of these materials with 2 wt.% of iron. The materials were characterized in terms of N-2 adsorption at -196 degrees C, elemental analysis (EA), and the pH at the point of zero charge (pH(PZC)). The p-nitrophenol (PNP) degradation and mineralization (assessed in terms of total organic carbon-TOC-removal) were evaluated during adsorption, catalytic wet peroxidation (CWPO), and Fenton process. The textural and chemical properties of the carbon-based materials play an important role in such processes, as it was found that the support with the highest surface area -AC- presents the best performance in adsorption, whereas the materials with the highest mesopore surface area -XG or Fe/XG- lead to best removals by oxidation processes (for XG it was achieved 39.7 and 35.0% and for Fe/XG 45.4 and 41.7% for PNP and TOC, respectively). The presence of N-functionalities increases such removals. The materials were reused in consecutive cycles: the carbon-based materials were deactivated by hydrogen peroxide, while the catalysts showed high stability and no Fe leaching. For the support with superior performances -XG-, the effect of nitrogen content was also evaluated. The removals increase with the increase of the nitrogen content, the maximum removals (81% and 65% for PNP and TOC, respectively) being reached when iron supported on a carbon xerogel doped with melamine was used as catalyst.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 18