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Influence of different pore-forming agents on wollastonite microstructures and adsorption capacities

Authorized Users Only
2017
Authors
Obradović, Nina
Filipović, Suzana
Marković, Smilja
Mitrić, Miodrag
Rusmirović, Jelena
Marinković, Aleksandar
Antić, Vesna
Pavlović, Vladimir B.
Article (Published version)
Metadata
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Abstract
In this study, porous macro- and micro-cellular wollastonite-based ceramics was synthesized. A ceramic precursor, methylhydrocyclosiloxane, together with micro-sized CaCO3, was used as a starting material. After 20 min of ultrasound treatment, and calcination at 250 °C for 30 min, different pore-forming agents were added to the as-obtained powders. Differential thermal analysis was used to determine characteristic temperatures of processes occurring within powders during heating. Based on the obtained results, the sintering regime was set up. The prepared mixtures were pressed into pallets and sintered at 900 °C. During the sintering regime, porous wollastonite-based ceramics was obtained. The phase composition of the sintered samples, as well as the microstructures, were analyzed by using X-ray diffraction and SEM. A two-phase system was detected in all samples, CaSiO3 wollastonite and Ca2SiO4 larnite, and their ratio varied with each pore-forming agent. It was observed that the addit...ion of different pore-forming agents resulted in significantly different microstructures. In a batch test, the influence of pH, the contact time and the initial ion concentration on the adsorption efficiency of As+5, Cr+6and phosphate ions on the synthesized adsorbents were studied. Time-dependent adsorption is best described by the pseudo-second-order kinetic model and the Weber-Morris model, which predict intra-particle diffusion as a rate-controlling step of the overall process. High adsorption capacities, 21.93, 23.88, and 27.29 mg g–1, were obtained for the CaCO3-siloxane-nanocellulose sorbent, and similar/lower capacities were obtained for the CaCO3-siloxane-PMMA and CaCO3-siloxane-cotton wool adsorbents.

Keywords:
pore-forming agents / sintering / wollastonite / adsorption capacity
Source:
Ceramics International, 2017, 43, 10, 7461-7468
Publisher:
  • Elsevier
Projects:
  • Directed synthesis, structure and properties of multifunctional materials (RS-172057)
  • Bilateral cooperation between Serbia and France, No. 4510339/2016/09/03 “Inteligent econanomaterials and nanocomposites”

DOI: 10.1016/j.ceramint.2017.03.021

ISSN: 0272-8842

WoS: 000400880000012

Scopus: 2-s2.0-85014780511
[ Google Scholar ]
17
13
URI
http://dais.sanu.ac.rs/123456789/2370
Collections
  • ITN SANU - Opšta kolekcija / ITS SASA - General collection
Institution
Институт техничких наука САНУ / Institute of Technical Sciences of SASA
TY  - JOUR
AU  - Obradović, Nina
AU  - Filipović, Suzana
AU  - Marković, Smilja
AU  - Mitrić, Miodrag
AU  - Rusmirović, Jelena
AU  - Marinković, Aleksandar
AU  - Antić, Vesna
AU  - Pavlović, Vladimir B.
PY  - 2017
UR  - http://dais.sanu.ac.rs/123456789/2370
AB  - In this study, porous macro- and micro-cellular wollastonite-based ceramics was synthesized. A ceramic precursor, methylhydrocyclosiloxane, together with micro-sized CaCO3, was used as a starting material. After 20 min of ultrasound treatment, and calcination at 250 °C for 30 min, different pore-forming agents were added to the as-obtained powders. Differential thermal analysis was used to determine characteristic temperatures of processes occurring within powders during heating. Based on the obtained results, the sintering regime was set up. The prepared mixtures were pressed into pallets and sintered at 900 °C. During the sintering regime, porous wollastonite-based ceramics was obtained. The phase composition of the sintered samples, as well as the microstructures, were analyzed by using X-ray diffraction and SEM. A two-phase system was detected in all samples, CaSiO3 wollastonite and Ca2SiO4 larnite, and their ratio varied with each pore-forming agent. It was observed that the addition of different pore-forming agents resulted in significantly different microstructures. In a batch test, the influence of pH, the contact time and the initial ion concentration on the adsorption efficiency of As+5, Cr+6and phosphate ions on the synthesized adsorbents were studied. Time-dependent adsorption is best described by the pseudo-second-order kinetic model and the Weber-Morris model, which predict intra-particle diffusion as a rate-controlling step of the overall process. High adsorption capacities, 21.93, 23.88, and 27.29 mg g–1, were obtained for the CaCO3-siloxane-nanocellulose sorbent, and similar/lower capacities were obtained for the CaCO3-siloxane-PMMA and CaCO3-siloxane-cotton wool adsorbents.
PB  - Elsevier
T2  - Ceramics International
T1  - Influence of different pore-forming agents on wollastonite microstructures and adsorption capacities
SP  - 7461
EP  - 7468
VL  - 43
IS  - 10
DO  - 10.1016/j.ceramint.2017.03.021
ER  - 
@article{
author = "Obradović, Nina and Filipović, Suzana and Marković, Smilja and Mitrić, Miodrag and Rusmirović, Jelena and Marinković, Aleksandar and Antić, Vesna and Pavlović, Vladimir B.",
year = "2017",
url = "http://dais.sanu.ac.rs/123456789/2370",
abstract = "In this study, porous macro- and micro-cellular wollastonite-based ceramics was synthesized. A ceramic precursor, methylhydrocyclosiloxane, together with micro-sized CaCO3, was used as a starting material. After 20 min of ultrasound treatment, and calcination at 250 °C for 30 min, different pore-forming agents were added to the as-obtained powders. Differential thermal analysis was used to determine characteristic temperatures of processes occurring within powders during heating. Based on the obtained results, the sintering regime was set up. The prepared mixtures were pressed into pallets and sintered at 900 °C. During the sintering regime, porous wollastonite-based ceramics was obtained. The phase composition of the sintered samples, as well as the microstructures, were analyzed by using X-ray diffraction and SEM. A two-phase system was detected in all samples, CaSiO3 wollastonite and Ca2SiO4 larnite, and their ratio varied with each pore-forming agent. It was observed that the addition of different pore-forming agents resulted in significantly different microstructures. In a batch test, the influence of pH, the contact time and the initial ion concentration on the adsorption efficiency of As+5, Cr+6and phosphate ions on the synthesized adsorbents were studied. Time-dependent adsorption is best described by the pseudo-second-order kinetic model and the Weber-Morris model, which predict intra-particle diffusion as a rate-controlling step of the overall process. High adsorption capacities, 21.93, 23.88, and 27.29 mg g–1, were obtained for the CaCO3-siloxane-nanocellulose sorbent, and similar/lower capacities were obtained for the CaCO3-siloxane-PMMA and CaCO3-siloxane-cotton wool adsorbents.",
publisher = "Elsevier",
journal = "Ceramics International",
title = "Influence of different pore-forming agents on wollastonite microstructures and adsorption capacities",
pages = "7461-7468",
volume = "43",
number = "10",
doi = "10.1016/j.ceramint.2017.03.021"
}
Obradović N, Filipović S, Marković S, Mitrić M, Rusmirović J, Marinković A, Antić V, Pavlović VB. Influence of different pore-forming agents on wollastonite microstructures and adsorption capacities. Ceramics International. 2017;43(10):7461-7468
Obradović, N., Filipović, S., Marković, S., Mitrić, M., Rusmirović, J., Marinković, A., Antić, V.,& Pavlović, V. B. (2017). Influence of different pore-forming agents on wollastonite microstructures and adsorption capacities.
Ceramics InternationalElsevier., 43(10), 7461-7468. 
https://doi.org/10.1016/j.ceramint.2017.03.021
Obradović Nina, Filipović Suzana, Marković Smilja, Mitrić Miodrag, Rusmirović Jelena, Marinković Aleksandar, Antić Vesna, Pavlović Vladimir B., "Influence of different pore-forming agents on wollastonite microstructures and adsorption capacities" 43, no. 10 (2017):7461-7468,
https://doi.org/10.1016/j.ceramint.2017.03.021 .

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