3d porous network structured co and ni catalysts for 4-nitrophenol reduction reaction

3d porous network structured cobalt and nickel bead catalysts were easily greenly fabricated in the presence of chitosan for the catalytic reduction of 4-nitrophenol to 4-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 (41.24 m2/g), total pore volume (0.035 cm3/g), and pore diameter (3.59 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 0.498 and 0.074 min-1 for co@chitosan and ni@chitosan, respectively. the catalytic activity of the catalysts was competitive and guided for 4-nitrophenol reduction applications.