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Hydrolysis kinetics of lead silicate glass in acid solution |
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| Authors: | Rafi Ali Rahimi Sayed Khatibuleslam Sadrnezhaad Gholamreza Raisali |
| Affiliation: | a Materials and Energy Research Center, P.O. Box 14155-4777, Tehran, Iran b Material Research School, Nuclear Science & Technology Research Institute (NSTIR), Atomic Energy Organization of Iran, Moazen Street, Rajaei Shahr, Karaj 31485-498, Iran c Center of Excellence for Production of Advanced Materials, Department of Materials Science and Engineering, Sharif University of Technology, P.O. Box 11365-9466, Tehran, Iran d Radiation Applications Research School, Nuclear Science & Technology Research Institute, Atomic Energy Organization of Iran, End of Karegare Shomali Street, Tehran 11365-3486, Iran |
| Abstract: | Hydrolysis kinetics of the lead silicate glass (LSG) with 40 mol% PbO in 0.5 N HNO3 aqueous acid solution was investigated. The surface morphology and the gel layer thickness were studied by scanning electron microscopy (SEM) micrographs. Energy dispersive X-ray spectroscopy (EDS) and inductively coupled plasma spectroscopy (ICP) were used to determine the composition of the gel layer and the aqueous solution, respectively. The silicon content of the dissolution products was determined by using weight-loss data and compositions of the gel layer and the solution. The kinetic parameters were determined using the shrinking-core-model (SCM) for rate controlling step. The activation energy obtained for hydrolysis reaction was Qche = 56.07 kJ/mole. The diffusion coefficient of the Pb ions from the gel layer was determined by using its concentration in solution and in LSG. The shrinkage of the sample and the gel layer thickness during dissolution process were determined. |
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