Synthesis of rare earth (Dy and Pr) metal impreganated asparagine functionalized CoFe2O4 nanocomposite: Two novel, efficient and magnetically-recoverable catalysts for the reduction of 4-nitrophenol

Abstract

In recent times biomolecules engineered magnetically isolable nanoparticles have garnered significant attention in nanocatalysis arena due to their outstanding features. Doping of rare earth metals over them brings further novelty in their properties. In this current work we describe the successful synthesis of rare earth lanthanide (M = Pr, Dy) impregnated asparagine adorned CoFe2O4 as two novel magnetically isolable nanocomposite catalyst following post-functionalization approach. The as synthesized materials were characterized using physicochemical techniques like FT-IR, SEM, EDX, elemental mapping and ICP-OES analyses. Subsequently, catalytic efficiency of the materials were investigated in the reduction of 4-Nitrophenol (4-NP), a well-known carcinogenic contaminants of water. Progress of the reaction and its kinetics were monitored over UV-Vis spectroscopy. Among the two variant, Dy anchored catalyst was found to be more efficient than the Pr which led the reaction to completion in just 8 min. Kinetically also Dy catalyst exhibited higher rate constants. This is the first report of Pr and Dy anchored heterogeneous catalyst in the reduction of 4-NP. The current methodology is advantageous in terms of cleanliness, simple procedure, excellent yields in short reaction time, easy magnetic retrieval and reusability of catalysts following several runs without significant change in catalytic activity.