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Nitrate-assisted photocatalytic efficiency of defective Eu ̶ doped Pr(OH)3 nanostructures

Abstract

Pr(OH)3 one dimensional nanostructures present less studied member of lanthanide hydroxides which recently demonstrated excellent adsorption capacity for organic pollutant removal from wastewater. In this study, Pr1-xEux(OH)3 (x = 0, 0.01, 0.03, 0.05) defective nanostructures, were synthesized by facile and scalable microwave-assisted hydrothermal method using KOH as alkaline metal precursor. The phase and surface composition, morphology, vibrational, electronic and optical properties of the as-prepared samples were characterized by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), Inductively Coupled Plasma Optical Emission Spectrometry (ICP-OES), Transmission electron microscopy (TEM), Field emission scanning electron microscopy (FE-SEM), Raman, infrared (IR), Photoluminescence (PL) and diffuse reflectance spectroscopy (DRS). It was deduced that incorporation of Eu3+ ions promotes the formation of oxygen vacancies in already defective Pr(OH)3, changing at the same time the Pr(OH)3 nanorods morphology. The presence of KNO3 phase was registered in Eu-doped samples. The oxygen-deficient Eu-doped Pr(OH)3 nanostructures display improved photocatalytic activity in reactive orange (RO16) dye removal under UV-vis light irradiation. Enhanced photocatalytic activity of Eu-doped Pr(OH)3 nanostructures is caused by synergetic effect of oxygen vacancies and Eu3+ (NO3−) ions present on Pr(OH)3 surface, on charge separation efficiency and formation of reactive radicals. In addition, 3% Eu-doped sample exhibited very good adsorptive properties due to different morphology and higher electrostatic attraction with anionic dye. Pr1-xEux(OH)3 nanostructures with possibility of tuning their adsorption/photocatalytic properties present great potential for wastewater treatment.

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Publication details

The article was accepted on 06 Nov 2017 and first published on 07 Nov 2017


Article type: Paper
DOI: 10.1039/C7CP06440C
Citation: Phys. Chem. Chem. Phys., 2017, Accepted Manuscript
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    Nitrate-assisted photocatalytic efficiency of defective Eu ̶ doped Pr(OH)3 nanostructures

    S. Aškrabić, V. D. D. Araújo, M. Passacantando, M. Basso, N. Tomić, B. Dojcinovic, D. Manojlovic, B. Calija, M. Miletić and Z. D. Dohčević-Mitrović, Phys. Chem. Chem. Phys., 2017, Accepted Manuscript , DOI: 10.1039/C7CP06440C

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