Morphology Controlled CuO Nanostructures for Efficient Catalytic Reduction of 4-Nitrophenol
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Catalytic transformation of nitroaromatic compounds in wastewater using nanostructured catalysts is a promising method for wastewater treatment. Here, we report a systematic study on morphology-dependent catalytic activity of CuO nanostructures for efficient reduction of 4-nitrophenol (4-NP) in water. The morphology of CuO nanostructures was controllably varied from nanorods, nanosheets and hierarchical 3D flower-like structures by simply varying ammonia concentration in a simple wet chemical approach. Catalytic transformation of toxic 4-NP into useful 4-aminophenol by the prepared nanostructured CuO samples were investigated. The impact of morphology on the catalytic activity of nanostructured CuO catalysts was examined. It was observed that hierarchical 3D flower-like CuO catalysts show enhanced catalytic activity as compared to nanorods and nanosheets. The origin of this morphology-dependent catalytic activity of CuO nanostructures is discussed.
KeywordsCuO Flowers Nanosheets Nanorods Catalyst 4-Nitrophenol
KS is obliged to the DST (Department of Science and Technology), New Delhi for funding in the form of DST-WOS-A project (SR/WOS-A/PM-10/2017(G&C)). The authors are thankful to Prof. Shyamal Kumar Saha (IACS, Kolkata) for extending the PL facility and Tapas for his help in PL measurements and acknowledge support from Centre for Research in Nanoscience and Nanotechnology, University of Calcutta for FESEM studies, Guru Gobind Singh Indraprastha University for funding under FRGS project (GGSIPU/DRC/Ph.D./Adm./2016/1563) and DST for providing UV–Vis–NIR and Raman facilities under FIST grant (SR/FST/PSI-167/2011(C)).
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