Photocatalytic hydrogenation of nitroarenes: supporting effect of CoO x on TiO 2 nanoparticles

Cobalt oxide visible light-active photo-catalysts supported on TiO 2 nanoparticles with varying amount of cobalt oxide [3% CoO x /TiO 2 ( A ), 4% CoO x /TiO 2 ( B ), 5% CoO x /TiO 2 ( C )] were synthesized by solid-state method followed by calcination. The as-synthesized catalysts were characterized...

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Published in:New journal of chemistry 2019-01, Vol.43 (2), p.748-754
Main Authors: Amanchi, Srinivasa Rao, Ashok Kumar, K. V., Lakshminarayana, Bhairi, Satyanarayana, G., Subrahmanyam, Ch
Format: Article
Language:English
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Summary:Cobalt oxide visible light-active photo-catalysts supported on TiO 2 nanoparticles with varying amount of cobalt oxide [3% CoO x /TiO 2 ( A ), 4% CoO x /TiO 2 ( B ), 5% CoO x /TiO 2 ( C )] were synthesized by solid-state method followed by calcination. The as-synthesized catalysts were characterized by various techniques such as powder XRD, TEM, EDX, UV-Vis-DRS and XPS analysis. The photocatalytic activity of the as-synthesized materials was studied for the reduction of nitroarenes to the corresponding amines using hydrazine monohydrate as the reductant. Cobalt( ii ) oxide is responsible for the reduction of nitroarenes and then, cobalt( iii ) is reduced back to the original compound by hydrazine hydrate, thus ascertaining the catalytic nature of this hydrogenation process. XPS suggests the presence of Co( ii ) in CoO x /TiO 2 .
ISSN:1144-0546
1369-9261
DOI:10.1039/C8NJ05260C