Abstract
Highly efficient nanocomposites (Ag/HHP and Ru/HHP) of Ag and Ru nanoparticles (NPs) supported on human hair powder (HHP) were prepared for reduction of 4-nitrophenol (4-NP) to 4-aminophenol. Ag/HHP and Ru/HHP worked well for reduction of 4-NP with faster reaction rate, exhibiting best rate constant (kapp) of 5.94 × 10−2 s−1 and 6.12 × 10−2 s−1, respectively. To the best of the authors’ knowledge, these are the most efficient nanocatalysts for reduction of 4-NP reported to date. Both Ag/HHP and Ru/HHP could be reused without significant loss in catalytic activity; the physicochemical stability of Ag/HHP and Ru/HHP (after 10th use) was found to be excellent. A mechanism for the catalytic reduction of 4-NP is proposed, and the catalytic activity of the present materials is compared with previously reported results.
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