Abstract
A simple and efficient microwave-assisted procedure for synthesis of L-cysteine-capped nickel nanoparticles (cyst-Ni NPs) in ethylene glycol solvent was demonstrated. The as-synthesised NPs were characterised by ultraviolet–visible (UV–Vis) spectrophotometer, Fourier transform infrared (FTIR) spectroscopy, transmission electron microscopy (TEM) and X-ray diffractometry (XRD). The cyst-Ni NPs are proved to be excellent heterogeneous catalysts for the 100 % reduction of 4-nitrophenol (4-NPh) in the presence of reductant (NaBH4) within reaction time of 40 s. In contrast, Raney nickel in similar sample environments shows only 25.5 % reduction. The kinetic and energetic behaviours of cyst-Ni NPs were also studied, and the reduction reaction is determined to follow pseudo-first-order kinetics with a rate constant value of 0.115 s−1 and activation energy of 36.1 kJ·mol−1. In addition to its high catalytic competence, cyst-Ni NPs catalyst exhibits excellent recyclability with negligible catalytic poisoning.
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Acknowledgments
This work was financially supported by the King Saud University via their Research Project (No. RGP-VPP-236). The authors acknowledge facilities provided by the National Centre of Excellence in Analytical Chemistry, University of Sindh, Jamshoro, Pakistan Higher Education Commission (HEC), Pakistan, and the Interface Analysis Centre, University of Bristol, Bristol, United Kingdom.
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Kalwar, N.H., Nafady, A., Soomro, R.A. et al. Microwave-assisted synthesis of L-cysteine-capped nickel nanoparticles for catalytic reduction of 4-nitrophenol. Rare Met. 34, 683–691 (2015). https://doi.org/10.1007/s12598-015-0475-8
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DOI: https://doi.org/10.1007/s12598-015-0475-8