Ruthenium Supported on Ionically Cross-linked Chitosan-Carrageenan Hybrid MnFe2O4 Catalysts for 4-Nitrophenol Reduction

• Tipo: Artigo em Revista Científica Internacional
• Data: 2019

Autores

Liew, KH (Autor) Outra; Lee, TK (Autor) Outra; Yarmo, MA (Autor) Outra; Loh, KS (Autor) Outra; Peixoto, AF (Autor) FCUP; Cristina Freire (Autor) FCUP; Yusop, RM (Autor) Outra

Revista

Título: Catalysts

Vol. 9

Página Final: 254

ISSN: 2073-4344

Editora: MDPI

Indexação

ISI Web of Knowledge - 17 Citações

Scopus - 17 Citações

Outras Informações

ID Authenticus: P-00Q-FC8

DOI: 10.3390/catal9030254

Abstract (EN): Herein, we report a facile procedure to synthesize the hybrid magnetic catalyst (Ru@CS-CR@Mn) using ruthenium (Ru) supported on ionically cross-linked chitosan-carrageenan (CS-CR) and manganese ferrite (MnFe2O4) nanoparticles with excellent catalytic activity. The ionic gelation of CS-CR is acting as a protecting layer to promote the encapsulation of MnFe2O4 and Ru nanoparticles by electrostatic interactions. The presence of an active metal and a CS-CR layer on the as-prepared Ru@CS-CR@Mn catalyst was well determined by a series of physicochemical analyses. Subsequently, the catalytic performances of the Ru@CS-CR@Mn catalysts were further examined in the 4-nitrophenol (4-NP) reduction reaction in the presence of sodium borohydride (reducing agent) at ambient temperature. The Ru@CS-CR@Mn catalyst performed excellent catalytic activity in the 4-NP reduction, with a turnover frequency (TOF) values of 925 h(-1) and rate constant (k) of 0.078 s(-1). It is worth to mentioning that the Ru@CS-CR@Mn catalyst can be recycled and reused up to at least ten consecutive cycles in the 4-NP reduction with consistency in catalytic performance. The Ru@CS-CR@Mn catalyst is particularly attractive as a catalyst due to its superior catalytic activity and superparamagnetic properties for easy separation. We foresee this catalyst having high potential to be extended in a wide range of chemistry applications.

Idioma: Inglês

Tipo (Avaliação Docente): Científica

Nº de páginas: 12