Formation of Porous Wollastonite-based Ceramics after Sintering With Yeast as the Pore-forming Agent

Authors

  • Nina Obradović Institute of Technical Sciences of SASA
  • Suzana Filipović Institute of Technical Sciences of SASA
  • Jelena Rusmirović Innovation center, Faculty of Technology and Metallurgy, University of Belgrade
  • Georgeta Postole IRCELYON - UMR 5256 CNRS/Université Lyon1
  • Aleksandar Marinković Faculty of Technology and Metallurgy, University of Belgrade
  • Danka Radić Faculty of Agriculture, University of Belgrade
  • Vesna Rakić Faculty of Agriculture, University of Belgrade
  • Vladimir Pavlović Institute of Technical Sciences of SASA
  • Aline Auroux IRCELYON - UMR 5256 CNRS/Université Lyon1

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 that 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.

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Published

2017-12-13

Issue

Vol. 49 No. 3 (2017)

Section

Articles