Microporous composite SiO2-TiO2 spheres prepared via the peroxo route: Lead(II) removal in aqueous media
authors Morozov, R; Krivtsov, I; Avdin, V; Amghouz, Z; Gorshkov, A; Pushkova, E; Bol'shakov, O; Bulanova, A; Ilkaeva, M
nationality International
journal JOURNAL OF NON-CRYSTALLINE SOLIDS
author keywords SiO2; TiO2; Spherical particles; Silica-titania; Microporous; Lead adsorption; Peroxo method
keywords SOL-GEL PROCESS; MIXED OXIDES; TIO2 SPHERES; SILICA; ADSORPTION; TIO2-SIO2; CATALYSTS; MEMBRANE; DESIGN; WATER
abstract Composite microporous SiO2-TiO2 spheres and micro/mesoporous TiO2 spheres were prepared via the template free two-step synthetic route using aqueous peroxotitanate solution and tetraethyl orthosilicate (TEOS) as precursors. Both the composite SiO2-TiO2 and pure TiO2 spheres prepared by the solvent-exchange method were initially non-porous, but the applied reflux treatment in water-ethanol suspension successfully transformed them into microporous materials with high apparent surface areas approaching 500 m(2).g(-1) and the micropore volume of 0.17 cm(3).g(-1), while maintaining the same morphology. The prepared composites retained high values of pore volume and specific surface area up to 400 degrees C of thermal treatment temperature. The crystallization of TiO2 into the anatase phase in the mixed oxide occurred only at 700 degrees C, that process was also accompanied by the significant reduction of pore volume, as well as apparent surface area values. The prepared materials were tested as adsorbents for the lead(II) removal; they demonstrated high adsorption capacities, reaching 340 mg(Pb2+).g(-1) Moreover, the mixed silica-titania oxide was found to be more efficient adsorbent at low pH values.
publisher ELSEVIER SCIENCE BV
issn 0022-3093
year published 2018
volume 497
beginning page 71
ending page 81
digital object identifier (doi) 10.1016/j.jnoncrysol.2017.11.031
web of science category Materials Science, Ceramics; Materials Science, Multidisciplinary
subject category Materials Science
unique article identifier WOS:000438479200010
link https://www.sciencedirect.com/science/article/pii/S0022309317306348?via%3Dihub
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