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Formation of porous wollastonite-based ceramics after sintering with yeast as the pore-forming agent

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2017
Obradovic_Science-of-Sintering_2017_49_3_235-246.pdf (462.8Kb)
Authors
Obradović, Nina
Filipović, Suzana
Rusmirović, Jelena
Postole, Georgeta
Marinković, Aleksandar
Radić, Danka
Rakić, Vesna M.
Pavlović, Vladimir B.
Auroux, Aline
Article (Published version)
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Abstract
In this paper, synthesis of porous wollastonite-based ceramics was reported. Ceramic precursor, methylhydrocyclosiloxane, together with micro-sized CaCO3, was used as starting material. After 20 min of ultrasound treatment, and calcination at 250 oC for 30 min, yeast as a pore-forming agent was added to the as-obtained powders. Sintering regime was set up based on the results obtained by differential thermal analysis. Prepared mixture was pressed into pallets and sintered at 900 oC for 1 h. After the sintering regime, porous wollastonite-based ceramics was obtained. The phase composition of the sintered samples as well as microstructures was analyzed by X-ray diffraction method and SEM. In a batch test, the influence of pH, contact time and initial ion concentration on adsorption efficiency of As+5, Cr+6, and phosphate ions on synthesized wollastonite-based ceramics were studied. Time-dependent adsorption was best described by pseudo-second-order kinetic model and Weber-Morris model th...at predicted intra-particle diffusion as a rate-controlling step of overall process. High adsorption capacities 39.97, 21.87, and 15.29 mgg-1 were obtained for As+5, Cr+6, and phosphate ions, respectively.

Keywords:
porous wollastonite ceramics / yeast / sintering
Source:
Science of Sintering, 2017, 49, 3, 235-246
Publisher:
  • Belgrade : International Institute for the Science of Sintering

DOI: 10.2298/SOS1703235O

ISSN: 0350-820X (Print); 1820-7413 (Online)

WoS: 000412888800003

Scopus: 2-s2.0-8503783929
[ Google Scholar ]
URI
http://dais.sanu.ac.rs/123456789/2384
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  • ITN SANU - Opšta kolekcija
Institution
Институт техничких наука САНУ

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