Catalytic Reduction of p-Nitrophenol and Carbonyl Compounds by NiO-Nanoparticles Fastened Graphene Oxide

Abstract

Ariviyal Publishing Journals ISSN: 2582-3353 Abstract: Owing to high activity and cost-effectiveness, NiO nanocomposites have been utilized in wide range of catalytic applications. In the present study, ultrafine NiO nanoparticles with average size of 7.5 nm were uniformly dispersed on graphene oxide by simple mix and heat method (Ni-oxide/GOSs). TEM and AFM results revealed the uniform dispersion of the Ni-oxide nanoparticles on the graphene oxide surface. Interaction between NiO nanoparticles and GO sheets were studied by Raman. SEM-EDS and XRD were used to study the Ni-loading and crystalline properties of Ni-oxide/GOSs. After being optimized, the Ni-oxide/GOSs catalyst was used for the reduction of 4-nitrophenol and carbonyl compounds. The reduction of 4-nitrophenol by Ni-oxide/GOSs was found to be very rapid and selective. An excellent kapp value of 60.8 ×10 -3 min was determined from the plots of ln[Ct/C0] versus reaction time for the reduction of 4-nitrophenol over 1.0 mg of Ni-oxide/GOSs. To our delight, the Ni-oxide/GOSs showed excellent activity in transfer hydrogenation of carbonyl compounds. Results confirmed that the Ni-oxide/GOSs catalyst is highly reusable in both reductions of 4-nitrophenol and carbonyl compounds.