۳D Porous Network Structured Co and Ni Catalysts for ۴-Nitrophenol Reduction Reaction

۳D porous network structured cobalt and nickel bead catalysts were easily greenly fabricated in the presence of chitosan for the catalytic reduction of ۴-nitrophenol to ۴-aminophenol. Physicochemical properties and morphology were determined using XRD, nitrogen adsorption/desorption, FT-IR, and SEM /EDS analyses. While the XRD pattern and FT-IR spectra showed the presence of chitosan, peaks related to cobalt and nickel species were not observed. Nitrogen adsorption/desorption isotherms exhibited a behavior indicating of micro-mesoporous structure. The surface area (۴۱.۲۴ m۲/g), total pore volume (۰.۰۳۵ cm۳/g), and pore diameter (۳.۵۹ nm) values of Ni@chitosan catalyst were acquired higher than that of Co@chitosan catalyst. EDS mapping showed that cobalt and nickel were homogeneously distributed in the chitosan structure. Co@chitosan exhibited higher catalytic activity. Reaction rate constant values were found as ۰.۴۹۸ and ۰.۰۷۴ min-۱ for Co@chitosan and Ni@chitosan, respectively. The catalytic activity of the catalysts was competitive and guided for ۴-nitrophenol reduction applications.

کلیدواژه ها:

Cobalt-nickel catalyst ، chitosan beads ، ۴-Nitrophenol ، catalytic reduction reaction