Magnetic porous PtNi/SiO2 nanofibers for catalytic hydrogenation of p-nitrophenol

• Published in: Journal of nanoparticle research : an interdisciplinary forum for nanoscale science and technology Vol. 19; no. 6; p. 1
• Main Authors: Guan, Huijuan, Chao, Cong, Kong, Weixiao, Hu, Zonggao, Zhao, Yafei, Yuan, Siguo, Zhang, Bing
• Format: Journal Article
• Language: English
• Published: Dordrecht Springer Netherlands 01.06.2017; Springer Nature B.V
• Subjects: Adsorption; Catalysts; Catalytic activity; Characterization and Evaluation of Materials; Chemistry and Materials Science; Emission analysis; Hydrogenation; Inductively coupled plasma; Inorganic Chemistry; Intermetallic compounds; Lasers; Magnetic properties; Materials Science; Nanoalloys; Nanofibers; Nanoparticles; Nanotechnology; Nitrophenol; Optical Devices; Optics; p-Nitrophenol; Photonics; Physical Chemistry; Research Paper; Silicon dioxide; X ray photoelectron spectroscopy; Nanocomposites; PtNi alloy nanocatalyst; Nitrophenol; nanofibers; Porous SiO; Hydrogenation reaction
• ISSN: 1388-0764; 1572-896X
• DOI: 10.1007/s11051-017-3884-9

In this work, the mesoporous SiO 2 nanofibers from pyrolyzing precursor of electrospun nanofibers were employed as support to immobilize PtNi nanocatalyst (PtNi/SiO 2 nanofibers). AFM, XRD, SEM, TEM, XPS, ICP-AES and N 2 adsorption/desorption analysis were applied to systematically investigate the morphology and microstructure of as-prepared products. Results showed that PtNi alloy nanoparticles with average diameter of 18.7 nm were formed and could be homogeneously supported on the surface of porous SiO 2 nanofiber, which further indicated that the SiO 2 nanofibers with well-developed porous structure, large specific surface area, and roughened surface was a benefit for the support of PtNi alloy nanoparticles. The PtNi/SiO 2 nanofibers catalyst exhibited an excellent catalytic activity towards the reduction of p -nitrophenol, and the catalyst’s kinetic parameter ( k n  = 434 × 10 −3  mmol s −1  g −1 ) was much higher than those of Ni/SiO 2 nanofibers (18 × 10 −3  mmol s −1  g −1 ), Pt/SiO 2 nanofibers (55 × 10 −3  mmol s −1  g −1 ) and previous reported PtNi catalysts. The catalyst could be easily recycled from heterogeneous reaction system based on its good magnetic properties (the Ms value of 11.48 emu g −1 ). In addition, PtNi/SiO 2 nanofibers also showed an excellent stability and the conversion rate of p -nitrophenol still could maintain 94.2% after the eighth using cycle.