Ruthenium supported on ionically cross-linked chitosan-carrageenan hybrid MnFe 2 O 4 catalysts for 4-nitrophenol reduction

Kin Hong Liew, Tian Khoon Lee, Mohd. Ambar Yarmo, Kee Shyuan Loh, Andreia F. Peixoto, Cristina Freire, Muhammad Rahimi Yusop

Research output: Contribution to journalArticle

Abstract

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.

Original languageEnglish
Article number254
JournalCatalysts
Volume9
Issue number3
DOIs
Publication statusPublished - 1 Mar 2019

Fingerprint

Ruthenium
Carrageenan
Chitosan
ruthenium
catalysts
Catalysts
catalytic activity
Catalyst activity
Nanoparticles
nanoparticles
borohydrides
4-nitrophenol
Nitrophenols
Reducing Agents
gelation
Reducing agents
Gelation
Coulomb interactions
Encapsulation
ambient temperature

Keywords

  • 4‐nitrophenol reduction
  • Carrageenan
  • Chitosan
  • MnFe O
  • Ruthenium

ASJC Scopus subject areas

  • Catalysis
  • Physical and Theoretical Chemistry

Cite this

Ruthenium supported on ionically cross-linked chitosan-carrageenan hybrid MnFe 2 O 4 catalysts for 4-nitrophenol reduction . / Liew, Kin Hong; Lee, Tian Khoon; Yarmo, Mohd. Ambar; Loh, Kee Shyuan; Peixoto, Andreia F.; Freire, Cristina; Yusop, Muhammad Rahimi.

In: Catalysts, Vol. 9, No. 3, 254, 01.03.2019.

Research output: Contribution to journalArticle

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AU - Lee, Tian Khoon

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AU - Loh, Kee Shyuan

AU - Peixoto, Andreia F.

AU - Freire, Cristina

AU - Yusop, Muhammad Rahimi

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AB - 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.

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