Magnetically recoverable Ir/IrO2@Fe3O4 core/ SiO2 shell catalyst for the reduction of organic pollutants in water

• Published in: Chemical physics letters 2020-03, Vol.742, p.137147, Article 137147
• Main Authors: Thekkathu, Ramani, Ashok, Devika, K Ramkollath, Pravisha, Neelakandapillai, Sandhyarani, Kurishunkal, Leon Prasanth, Yadav, M.S. Priyanka, Kalarikkal, Nandakumar
• Format: Article
• Language: English
• Subjects: Fe3O4 core/ SiO2 shell; Ir/IrO2 nanoparticles; Organic pollutants; Recyclability; Reduction
• ISSN: 0009-2614; 1873-4448
• DOI: 10.1016/j.cplett.2020.137147

[Display omitted] •Ir/IrO2@Fe3O4 core/ SiO2 shell catalyst was synthesized and well characterized.•Excellent catalytic activity in the reduction of organic pollutants in water.•Highly stable, easy separation and recyclability. Ir/IrO2 nanoparticles have been immobilized on Fe3O4 core/ SiO2 shell via surface modified NH2 functional groups for the reduction of organic pollutants in water. Ir/IrO2@Fe3O4 core/ SiO2 shell catalyst showed excellent catalytic activity in the reduction of 4-nitrophenol, 4-nitroaniline and 2-nitroaniline with the rate constants of 1.32 min−1, 1.34 min−1 and 0.92 min−1 respectively. The reductions were carried out in presence of NaBH4 reducing agent at room temperature. The presence of Ir/IrO2 interfaces in the catalyst is believed to be responsible for its high catalytic activity. Moreover, the catalyst shows high stability and efficient recyclability.