| Autor: |
Hashem, Amira A., Mahmoud, Sawsan A., Geioushy, Ramadan A., Fouad, Osama A. |
| Předmět: |
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| Zdroj: |
New Journal of Chemistry; 7/28/2021, Vol. 45 Issue 28, p12426-12434, 9p |
| Abstrakt: |
Calcium silicate nanopowders have been successfully synthesized from solution mixtures of silica fume and marble sawing dust via a simple, fast and eco-friendly microwave irradiation method. The formed calcium silicate nanoparticles were characterized via XRD, SEM, EDX, FTIR spectroscopy, Raman spectroscopy, and BET surface area techniques. Wollastonite CaSiO3 (CS), belite Ca2SiO4 (C2S), alite Ca3SiO5 and rankinite Ca3Si2O7 (C3S) were the main detected phases by XRD analyses. The ratio of calcia CaO (C) to silica SiO2 (S) and the time of irradiation played a pivotal role in the phase composition of the as-prepared samples. At the C/S molar ratio of 0.53 : 1, the predominant detected phases were alite and rankinite, whereas belite was detected as a minor phase. No other phases or compounds of starting materials could be detected. As the irradiation time increased from 3 to 6 min, the intensity of the XRD main peaks corresponding to alite and rankinite increased. SEM images indicate that the morphology of the as-prepared samples varied from slices on top of each other witha small rod-like shape to rod and plate-like crystals and regular layers on the top of each other by changing the C/S ratio and irradiation time. A sample prepared with a C/S ratio of 0.53 : 1 reveals that the particle size decreased from 680 nm to 345 nm upon irradiation for 40 s for 6 min. The N2 adsorption–desorption isotherms showed that all samples were of type III with a mesoporous structure (the pores size was in the range of 50–2 nm). The microwave irradiation method might be a promising route to effectively treat other waste materials in a cost–effective and productive way. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
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