Influence of structurization of [ZrYb]O2 - Al2O3 xerogels on the adsorption activity

P. A. E$^1$, N. E. Vakhrushev$^2$, I. I. Mikhalenko$^1$, A. A. Il'ichyova$^2$, L. I. Podzorova$^2$, A. A. Konovalov$^2$, A. M. Gordienko$^3$

Memoirs of the Faculty of Physics 2022. N 4.

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The effect of sol-gel synthesis (SGS) temperature on the structural, morphological and adsorption properties of 65%mol.[97%ZrO2–3%Yb2O3]–35%Al2O3 xerogels obtained in the presence of polymer at 10o (1), 25o (2), 60oC (3) and dried at 180oC was established in this work. The study of the X-ray amorphous hydrated xerogels by a complex of methods (TG/DSC, FTIR, SEM, XRD, SAXS, BET/BJH) showed their differences in the composition of surface complexes, morphology and size characteristics. Sample 3 had a different morphology, shape and size of pores from the other samples, this sample had the lowest activity in adsorption of dichromate ion from aqueous solution. The values of specific surface area and pore volume of xerogels decreased in the consequence of samples 1-2-3. A correlation between the specific surface of xerogels and the average volume of scattering particles determined by small-angle X-ray scattering (SAXS) was obtained also. The possibility of obtaining xerogels with monomodal distribution of heterogeneities ~ 7 nm and pores ~ 4 nm in radius, high values of pore volume ~ 0.326 cm3/g and specific surface area ~ 427 m2/g at TSGS =10oC was shown. The sample synthesized at 25oC was the best in quick removal of anionic Cr(VI) pollutant and adsorption per unit mass of the multi-oxide sorbent.

Received: 2022 May 19

Approved: 2022 August 8

PACS:

68.65.-k Low-dimensional, mesoscopic, nanoscale and other related systems: structure and nonelectronic properties

Authors

P. A. E$^1$, N. E. Vakhrushev$^2$, I. I. Mikhalenko$^1$, A. A. Il'ichyova$^2$, L. I. Podzorova$^2$, A. A. Konovalov$^2$, A. M. Gordienko$^3$
$^1$RUDN-University\
$^2$A.A. Baikov Institute of Metallurgy and Material Science, Russian Academy of Sciences\
$^3$Physics Department, Lomonosov Moscow State University

Issue 4, 2022

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