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


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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