Heteroatom-Doped Carbon Nanomaterials as Metal-Free Catalysts for the Reduction of 4-Nitrophenol

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

Autores

Jarrais, B (Autor) Outra; Guedes, A (Autor) FCUP; Cristina Freire (Autor) FCUP

Revista

Título: ChemistrySelect

Vol. 3

Páginas: 1737-1748

Editora: Wiley-Blackwell

Indexação

ISI Web of Knowledge - 30 Citações

Scopus - 29 Citações

Outras Informações

ID Authenticus: P-00N-MJN

DOI: 10.1002/slct.201702706

Abstract (EN): In this work it is described the preparation and characterization of multi-walled carbon nanotubes and graphene flakes doped with heteroatoms, namely N, P, B, and S, through simple ball milling procedures with adequate precursors, followed by thermal treatments. Ball milling the carbon nanomaterials with melamine resulted in the introduction of pyrrolic, pyridinic and quaternary N atoms on the graphitic structure. Using triphenylphosphine as the phosphorous precursor induced the formation of R-O-PO(OH)(2) functionalities. Materials prepared with boric acid showed the presence of boronic groups (C-BO2) and B atoms in B2O3. S-doped materials presented tiophene-S type atoms. The catalytic studies showed that all the doped carbon materials were active catalysts in the reduction of 4-nitrophenol (4-NP), and that the modifications introduced by the doping procedures, overall yielded catalysts with superior activity in regard to their pristine counterparts. Reusability experiments revealed no loss of catalytic activity up to three catalytic cycles for the doped carbon nanotubes, whereas the graphene flake materials showed some deterioration of catalytic performance.

Idioma: Inglês

Tipo (Avaliação Docente): Científica

Nº de páginas: 12