Influence of different pore-forming agents on wollastonite microstructures and adsorption capacities
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2017
Authors
Obradović, Nina
Filipović, Suzana

Marković, Smilja

Mitrić, Miodrag

Rusmirović, Jelena

Marinković, Aleksandar

Antić, Vesna
Pavlović, Vladimir B.

Article (Published version)

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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 capacitySource:
Ceramics International, 2017, 43, 10, 7461-7468Publisher:
- Elsevier
Funding / 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
Institution/Community
Институт техничких наука САНУ / Institute of Technical Sciences of SASATY - 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 - https://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 UR - https://hdl.handle.net/21.15107/rcub_dais_2370 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", 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", url = "https://hdl.handle.net/21.15107/rcub_dais_2370" }
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. in Ceramics International Elsevier., 43(10), 7461-7468. https://doi.org/10.1016/j.ceramint.2017.03.021 https://hdl.handle.net/21.15107/rcub_dais_2370
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. in Ceramics International. 2017;43(10):7461-7468. doi:10.1016/j.ceramint.2017.03.021 https://hdl.handle.net/21.15107/rcub_dais_2370 .
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" in Ceramics International, 43, no. 10 (2017):7461-7468, https://doi.org/10.1016/j.ceramint.2017.03.021 ., https://hdl.handle.net/21.15107/rcub_dais_2370 .