The Use of Metal Nanoparticle-Embedded Poly(ethyleneimine) Composite Microgel in the Reduction of Nitrophenols

摘要: Metal nanoparticles such as Ni, Cu, and Co were prepared within polyethyleneimine (PEI) microgels used in the reduction of 4-nitrophenol (4-NP) 2-nitrophenol (2-NP) to 4-aminophenol (4-AP) 2-aminophenol (2-AP). The metal nanoparticle content PEI-M composite catalyst system (M = Co, Cu) was increased by multiple loading cycles into PEI provide faster better 4-NP 2-NP. TOF value 1.48 from 0.353 (mol min)−1) for catalyzed PEI-Ni after three reduction. effect temperature on 2-NP reductions illustrated that higher resulted very fast reductions, e.g., at 70 °C times 1.2 0.67 min 4-AP 2-AP, respectively. activation parameters, energy, entropy, enthalpy, also calculated mild energies 38.8 46.0 kJ mol−1 found, respectively, comparison similar studies literature. Moreover, it demonstrated are reusable five consecutively, with almost 100 % conversion their catalytic activity.