Articles
  • Synthesis and characterization of wollastonite from egg shell and diatomite by the hydrothermal method
  • Ratchadaporn Puntharoda,b,*, Chanon Sankrama, Napat Chantarameec, Pusit Pookmaneea,b and Kenneth J. Hallerd
  • a Department of Chemistry, Maejo University, Chiang Mai 50290, Thailand b Nanoscience and Nanotechnology Laboratory, Maejo University, Chiang Mai 50290, Thailand c Department of Physics, Maejo University, Chiang Mai 50290, Thailand d School of Chemistry, Institute of Science, Suranaree University and Technolgy, Nakhon Ratchasima 30000, Thailand
Abstract
Wollastonite was synthesized using calcium oxide from egg shells and silica from diatomite by being calcined at 800 oC. The calcium oxide and silica was synthesized in a molar ratio of 1 : 1 using the hydrothermal method at 100, 150, and 200 oC for 24 hours and then calcined at 1,000 oC for 24 hours. The morphology of wollastonite which was characterized by SEM indicated that the particles were an agglomerate consisting of small particles with sizes less than 1 μm. The FTIR spectra showed that the carbonate band at 1459 cm-1 was absent from calcination product and that was further confirmed by a thermogravimetric analysis. The ν(Si(OSi)3O-Ca wollastonite band presented as a band at 930 cm-1. The XRD results clarly show the structural formation of wollastonite. This method used to synthesize wollastonite is simple and able to function using cheap starting materials.

Keywords: Wollastonite, Egg shell, Diatomite, Hydrothermal Method, Calcination

This Article

  • 2013; 14(2): 198-201

    Published on Apr 30, 2013