Enhanced photocatalytic degradation of methylene blue and methyl orange by ZnO:Eu nanoparticles
Lidija V. Trandafilović,Dragana Jovanovic,Xueqiang Zhang,Sylwia Ptasinska,Miroslav D. Dramićanin +4 more
TLDR
In this paper, the influence of europium doping and solvents on size, particles agglomeration, light absorption and photocatalytic activity was analyzed in ZnO nanoparticles.Abstract:
ZnO nanoparticles doped with different Eu3+ percentages were synthesized in water (ZnO:Eu(x%)-W) and other solvents (methanol ZnO:Eu(x%)-M and ethanol ZnO:Eu(x%)-E). X-ray diffraction (XRD), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), optical absorption and photoluminescence (PL) spectroscopy were used for characterization of the nanoparticles. Our results showed influence of europium doping and solvents on size, particles agglomeration, light absorption and photocatalytic activity. Improvement in photocatalytical activity with addition of Eu3+ doping was detected. Particle size increased with Eu3+ doping in water samples, while it decreased in methanol. Agglomeration was more prominent in ZnO:Eu(x%)-W samples. Greater amount of surface OH groups in case of ZnO:Eu(x%)-M samples was detected by PL, XPS and FTIR measurements. Influence of europium doping, as an electron trap, and surface OH groups, as a hole trap, was studied in sunlight photocatalytic degradation of cationic methylene blue (MB) and anionic methyl orange (MO). Improved photocatalytic behavior was discussed and influence of active species was further investigated using hole and hydroxyle radical scavengers. The degradation pathway of MB and MO, using high performance liquid chromatohraphy (HPLC), is also examined.read more
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Bio-mediated synthesis of ZnO nanostructures for efficient photodegradation of methyl orange and methylene blue
TL;DR: In this article, the synthesis of ZnO nanostructures using Syzygium cumini leaf extract-mediated synthesis has been reported, and the photodegradation efficiency of the synthesized ZnOs was determined under UV-Vis light using methyl orange and methylene blue as model dye pollutants.
Journal ArticleDOI
Ni11□ (HPO3)8(OH)6 multifunctional materials: Electrodes for oxygen evolution reaction and potential visible-light active photocatalysts
Bogdan-Ovidiu Taranu,Madalina Ivanovici,Paula Svera,Paulina Vlazan,Paula Sfirloaga,Maria Poienar +5 more
TL;DR: In this article, a comparative electrochemical study concerning the OER performance in alkaline medium of several graphite electrodes modified with the nickel phosphite was performed and the most promising electrodes were further characterised electrochemically and the electrode modified with Nafion solution and 5 µm Ni11□(HPO3)8(OH)6 exhibited the smallest overpotential value at the 10 µm−2 anodic current density.
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Environmental Friendly Natural Rubber- blend -Poly-vinylpyrrolidone/Silver (NR- b -PVP/Ag) Films for Improved Solar Driven Degradation of Organic Pollutants at Neutral pH
TL;DR: In this article, low cost films have been prepared from the blends of natural rubber latex with polyvinylpyrrolidone via casting technique, which are then impregnated with silver ions (Ag+) and subjected to low temperature heat treatments to form silver particles (Ag°).
Journal ArticleDOI
Mesocrystalline TiO 2 /sepiolite composites for the effective degradation of methyl orange and methylene blue
TL;DR: In this paper, mesocrystalline TiO2/sepiolite composites with the function of adsorption and degradation of liquid organic pollutants were successfully fabricated via a facile and low-cost solvothermal reaction.
Journal ArticleDOI
Rational design of visible-light-sensitive Ag-BiVO4 oxides by matching redox potentials of catalyst, dyes, and reactive oxygen species towards more efficient photocatalytic degradation
TL;DR: By employing a rational design approach of matching redox potentials of dye, catalysts, and reactive oxygen species (ROS), Ag-BiVO4 photo-catalysts of 2, 5 and 7wt% Ag were successfully prepared via sol-gel and UV photo-reduction methods as discussed by the authors.
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