sc6b01862_si_001.pdf (1.13 MB)
Metal Nanoparticle Loaded Magnetic-Chitosan Microsphere: Water Dispersible and Easily Separable Hybrid Metal Nano-biomaterial for Catalytic Applications
journal contribution
posted on 2016-12-05, 00:00 authored by Thanusu Parandhaman, Nagaraju Pentela, Baskaran Ramalingam, Debasis Samanta, Sujoy K. DasWe
report a green synthesis of magnetically separable hybrid metal
nanobiomaterial as water dispersible and recyclable catalysts. The
hybrid nanobiomaterial was prepared in a three-step process. The magnetic
nanoparticles were initially synthesized by biomineralization process
and coated with chitosan followed by binding and reduction of metal
ions, which led to the formation of a magnetically separable hybrid
nanobiomaterial (Fe3O4@Ch-MNPs, M = Au, Pd).
The chemical composition, morphology, thermal stability, and magnetic
behavior of the hybrid nanobiomaterial were characterized with zeta
potential, Fourier transform infrared (FTIR), X-ray photoelectron
spectroscopy (XPS), X-ray diffraction (XRD), vibrating sample magnetometer
(VSM), and field emission scanning electron microscopy (FESEM) analysis.
The FESEM measurement demonstrated formation of highly dispersed Au
and PdNPs on the surface of nanobiomaterial, while thermogravimetric
and VSM analyses indicated high thermal stability and superparamagnetic
behavior of the hybrid nanobiomaterial. The X-ray photoelectron spectroscopy
studies revealed formation of pure metallic nanoparticles on the surface
of the hybrid nanobiomaterial. The as-synthesized hybrid nanobiomaterial
were tested for several model reactions such as photocatalytic reduction
of dye, hydrogenation of p-nitrophenol, and Suzuki
coupling reaction at ambient temperature and in aqueous solution.
The catalytic efficiencies varied with the type of MNPs, and Fe3O4@Ch-PdNPs exhibited superior catalytic activities
in all chemical reactions. In addition the hybrid nanobiomaterial
demonstrated excellent recyclability and reusability without significant
loss of catalytic activities. Furthermore, the leaching of metal ions
was not detected during catalytic reaction confirming high stability
and low environmental impact of the as-synthesized hybrid nanobiomaterial.
We believe that our result will help to synthesize easily separable
hybrid nanobiomaterial as a heterogeneous catalyst through a cost-effective
and eco-benign synthetic route for the development of environmental
sustainable nanotechnology.