Nanopowders of Yttria-Stabilized Zirconia Doped with Rare Earth Elements as Adsorbents of Humic Acids
Autor: | Ewa Niewiara, Katarzyna Wilkosz, Małgorzata Suchanek, Władysław W. Kubiak |
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Jazyk: | angličtina |
Rok vydání: | 2019 |
Předmět: |
02 engineering and technology
010402 general chemistry 01 natural sciences Article law.invention symbols.namesake Adsorption law zirconia rare earth oxides Zeta potential Humic acid General Materials Science Cubic zirconia Crystallization Yttria-stabilized zirconia chemistry.chemical_classification Aqueous solution Langmuir adsorption model 021001 nanoscience & nanotechnology 0104 chemical sciences humic acids chemistry symbols adsorption properties 0210 nano-technology Nuclear chemistry |
Zdroj: | Materials Volume 12 Issue 23 |
ISSN: | 1996-1944 |
DOI: | 10.3390/ma12233915 |
Popis: | 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&rsquo 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. |
Databáze: | OpenAIRE |
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