Influence of different pore-forming agents on wollastonite microstructures and adsorption capacities
Само за регистроване кориснике
2017
Аутори
Obradović, NinaFilipović, Suzana
Marković, Smilja
Mitrić, Miodrag
Rusmirović, Jelena D.
Marinković, Aleksandar
Antić, Vesna
Pavlović, Vladimir
Чланак у часопису (Објављена верзија)
Метаподаци
Приказ свих података о документуАпстракт
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 degrees 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 degrees 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(+6)and 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.
Кључне речи:
Pore-forming agents / Sintering / Wollastonite / Adsorption capacityИзвор:
Ceramics International, 2017, 43, 10, 7461-7468Издавач:
- Elsevier Sci Ltd, Oxford
Финансирање / пројекти:
- Усмерена синтеза, структура и својства мултифункционалних материјала (RS-MESTD-Basic Research (BR or ON)-172057)
DOI: 10.1016/j.ceramint.2017.03.021
ISSN: 0272-8842
WoS: 000400880000012
Scopus: 2-s2.0-85014780511
Институција/група
Poljoprivredni fakultetTY - JOUR AU - Obradović, Nina AU - Filipović, Suzana AU - Marković, Smilja AU - Mitrić, Miodrag AU - Rusmirović, Jelena D. AU - Marinković, Aleksandar AU - Antić, Vesna AU - Pavlović, Vladimir PY - 2017 UR - http://aspace.agrif.bg.ac.rs/handle/123456789/4324 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 degrees 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 degrees 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(+6)and 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 Sci Ltd, Oxford T2 - Ceramics International T1 - Influence of different pore-forming agents on wollastonite microstructures and adsorption capacities EP - 7468 IS - 10 SP - 7461 VL - 43 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 D. and Marinković, Aleksandar and Antić, Vesna and Pavlović, Vladimir", 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 degrees 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 degrees 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(+6)and 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 Sci Ltd, Oxford", journal = "Ceramics International", title = "Influence of different pore-forming agents on wollastonite microstructures and adsorption capacities", pages = "7468-7461", number = "10", volume = "43", doi = "10.1016/j.ceramint.2017.03.021" }
Obradović, N., Filipović, S., Marković, S., Mitrić, M., Rusmirović, J. D., Marinković, A., Antić, V.,& Pavlović, V.. (2017). Influence of different pore-forming agents on wollastonite microstructures and adsorption capacities. in Ceramics International Elsevier Sci Ltd, Oxford., 43(10), 7461-7468. https://doi.org/10.1016/j.ceramint.2017.03.021
Obradović N, Filipović S, Marković S, Mitrić M, Rusmirović JD, Marinković A, Antić V, Pavlović V. 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 .
Obradović, Nina, Filipović, Suzana, Marković, Smilja, Mitrić, Miodrag, Rusmirović, Jelena D., Marinković, Aleksandar, Antić, Vesna, Pavlović, Vladimir, "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 . .