Nanopowders of Yttria-Stabilized Zirconia Doped with Rare Earth Elements as Adsorbents of Humic Acids

The aim of the investigations was to use, for the first time, zirconia nanopowders stabilized with yttria (YSZ) and rare element oxides (YSZ-Nd, YSZ-Gd) for removal of humic acids (HA) from aqueous solutions. Nanopowders were synthesized by means of hydrothermal crystallization and characterized usi...

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Bibliographic Details
Published in:Materials 2019-11, Vol.12 (23), p.3915
Main Authors: Suchanek, Małgorzata, Niewiara, Ewa, Wilkosz, Katarzyna, Kubiak, Władysław W
Format: Article
Language:English
Subjects:
Acids
Adsorbents
Adsorption
Aqueous solutions
Banded structure
Carbonyls
Crystallization
Experiments
Fourier transforms
Functional groups
Gadolinium
Humic acids
Infrared analysis
Infrared spectroscopy
Membrane separation
Morphology
Nanoparticles
Nitrates
Optical properties
Rare earth elements
Reaction time
Solid solutions
Yttria-stabilized zirconia
Yttrium oxide
Zeta potential
Zirconium
Zirconium dioxide
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Summary:The aim of the investigations was to use, for the first time, zirconia nanopowders stabilized with yttria (YSZ) and rare element oxides (YSZ-Nd, YSZ-Gd) for removal of humic acids (HA) from aqueous solutions. Nanopowders were synthesized by means of hydrothermal crystallization and characterized using scanning electron microscope (SEM) with energy dispersive X-ray spectroscopy (EDX), X-ray diffraction (XRD), Fourier transform infrared (FT-IR) methods and analysis of zeta potential. The adsorption processes analysis was carried out in a series of experiments depending on: initial concentration of humic acids, contact time, pH and mass of the used adsorbent. It was found, that the YSZ-Nd exhibits strong and much higher effectiveness of HA adsorption than YSZ and YSZ-Gd. The HA adsorption rate reached 96.8% for YSZ-Nd dosage of 100 mg, pH 4, and 15 min reaction time and for HA initial concentration equal to 25 mg/L. According to the Langmuir model simulation, the maximum adsorption capacity of HA on YSZ-Nd at pH 4 was calculated to be 2.95 mg/g. Changes in the FT-IR spectra of YSZ-Nd confirmed humic acids' adsorption on the tested nanopowders, by the presence of additional bands representing carboxylic, alcohol, carbonyl and amino groups in humic acid structure. These functional groups could represent humic acids binding on the YSZ, YSZ-Nd or YSZ-Gd surfaces.
ISSN:1996-1944
1996-1944
DOI:10.3390/ma12233915