Hetero–nanostructured Ni/α‐Mn₂O₃ as Highly Active Catalyst for Aqueous Phase Reduction Reactions

Abstract

In this work, a simple strategy for the synthesis of hetero‐nanostructured Ni/α‐Mn2O3 via surfactant‐aided co‐reduction method is reported. The as synthesized Ni/α‐Mn2O3 is applied as catalytic material for the aqueous phase reduction of 4‐nitrophenol (4‐NP) and organic dye pollutants, namely Rhodamine B (RhB), Methylene blue (MB), Rose Bengal (RB), Congo red (CR), and Methyl orange (MO) in the presence of a mild reducing agent, NaBH4. This synthetic route provides homogeneous dispersion of Ni nanoparticles over α‐Mn2O3 surface. The nanoparticles and support are characterized using XRD, SEM/EDX, TEM, AAS and BET surface area analyses. The Ni particles are spherical, crystalline and size ranges < 5 nm. Further, hetero‐nanostructured Ni/α‐Mn2O3 is established as a highly efficient recyclable catalyst for the reduction of 4‐NP to 4‐aminophenol (4‐AP). The HPLC and FTIR analysis shows that 4‐AP is the sole product of the reduction of 4‐NP. The Ni/α‐Mn2O3 also exhibits high activity towards reduction of cationic and anionic dye pollutants. Thus, the as synthesized hetero‐nanostructured Ni/α‐Mn2O3 can be considered as the future contender for the wastewater treatment.

Catalytic activity of Ni complexed aminoclay towards the reduction of Cr(V), p-nitrophenol and fluorescein dye

“…Komalam et al (2012) reported the catalytic reduction of Eosin B in the presence of chitosan stabilized Au nanoparticles. Similarly, other nanocatalysts were used for the degradation of xanthenes type dyes (Junejo and Baykal 2014;Deka et al 2016). On studying the literature, no report based on the AC-Ni catalyzed reduction of fluor could be found.…”

Mussel-inspired immobilization of Au on bare and graphene-wrapped Ni nanoparticles toward highly efficient and easily recyclable catalysts

“…4(a)). 34 Greater catalytic activity was shown by PD-Au ( Fig. 4(b)) compared to Ni-PD as 24% MB retained in solution aer an equal length of time.…”

Rapid Catalytic Reduction of 4-Nitrophenol and Clock Reaction of Methylene Blue using Copper Nanowires

“…The reduction process produces hydrogen gas which can be seen as bubbles in the solution. The isosbestic points can be found at 270 and 345 nm, and indicate that the sole product of the reaction is 4-AP [50,51]. The reduction of 4NP can be explained by using the Langmuir–Hinshelwood model of heterogeneous catalyzed reduction [49,52].…”