Facile synthesis, characterization and enhanced catalytic reduction of 4-nitrophenol using NaBH4 by undoped and Sm3+, Gd3+, Hf3+ doped La2O3 nanoparticles. View Full Text


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Article Info

DATE

2019-12

AUTHORS

Guguloth Ravi, Madderla Sarasija, Dasari Ayodhya, Lunavath Shanthi Kumari, Dongamanti Ashok

ABSTRACT

This work focuses on the synthesis of undoped and doped lanthanum oxide nanoparticles (La2O3 NPs) by a simple co-precipitation method for the catalytic reduction of 4-nitrophenol (4-NP) using NaBH4 as a reducing agent. Their optical properties, morphologies, structure, chemical compositions and electronic properties were carefully characterized by XRD, FTIR, SEM, TEM, PL and UV-visible absorption spectroscopy. The SEM and TEM images showed various shape morphologies and sizes of the particles. The XRD pattern revealed a polycrystalline nature with the hexagonal structure of the La2O3 NPs. The synthesized undoped and doped La2O3 NPs were also employed as catalysts for the reduction of 4-nitrophenol, it shows that the doped (Sm3+, Gd3+ and Hf3+) La2O3 NPs provided better catalytic activity than the undoped La2O3 NPs. Moreover, Hf3+ doped La2O3 NPs exhibited an enhanced catalytic activity for the reduction of 4-nitrophenol to 4-aminophenol in 90 min. The catalytic conversion was studied by UV-vis spectroscopy with high reduction rate (k = 2.048 min-1). The applications of the present study may utilize in the removal of toxic pollutants in a cleaning of environmental pollution as well as in industrial applications. More... »

PAGES

12

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URI

http://scigraph.springernature.com/pub.10.1186/s40580-019-0181-6

DOI

http://dx.doi.org/10.1186/s40580-019-0181-6

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https://app.dimensions.ai/details/publication/pub.1113328085

PUBMED

https://www.ncbi.nlm.nih.gov/pubmed/30968322


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46 schema:description This work focuses on the synthesis of undoped and doped lanthanum oxide nanoparticles (La<sub>2</sub>O<sub>3</sub> NPs) by a simple co-precipitation method for the catalytic reduction of 4-nitrophenol (4-NP) using NaBH<sub>4</sub> as a reducing agent. Their optical properties, morphologies, structure, chemical compositions and electronic properties were carefully characterized by XRD, FTIR, SEM, TEM, PL and UV-visible absorption spectroscopy. The SEM and TEM images showed various shape morphologies and sizes of the particles. The XRD pattern revealed a polycrystalline nature with the hexagonal structure of the La<sub>2</sub>O<sub>3</sub> NPs. The synthesized undoped and doped La<sub>2</sub>O<sub>3</sub> NPs were also employed as catalysts for the reduction of 4-nitrophenol, it shows that the doped (Sm<sup>3+</sup>, Gd<sup>3+</sup> and Hf<sup>3+</sup>) La<sub>2</sub>O<sub>3</sub> NPs provided better catalytic activity than the undoped La<sub>2</sub>O<sub>3</sub> NPs. Moreover, Hf<sup>3+</sup> doped La<sub>2</sub>O<sub>3</sub> NPs exhibited an enhanced catalytic activity for the reduction of 4-nitrophenol to 4-aminophenol in 90 min. The catalytic conversion was studied by UV-vis spectroscopy with high reduction rate (k = 2.048 min<sup>-1</sup>). The applications of the present study may utilize in the removal of toxic pollutants in a cleaning of environmental pollution as well as in industrial applications.
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