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Hydrolysis kinetics of lead silicate glass in acid solution

Rahimi, R. A ; Sharif University of Technology | 2009

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  1. Type of Document: Article
  2. DOI: 10.1016/j.jnucmat.2009.02.028
  3. Publisher: 2009
  4. Abstract:
  5. 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. © 2009 Elsevier B.V. All rights reserved
  6. Keywords:
  7. Acid solutions ; Aqueous acids ; Aqueous solutions ; Diffusion coefficients ; Dissolution process ; Dissolution products ; Energy dispersive x-ray spectroscopies ; Gel layers ; Hydrolysis kinetics ; Hydrolysis reactions ; Inductively coupled plasma spectroscopies ; Lead-silicate glass ; Pb ions ; Rate-controlling ; Sem ; Silicon contents ; Weight loss ; Acids ; Activation energy ; Chemical analysis ; Dissolution ; Gelation ; Gels ; Glass ; Hydrolysis ; Inductively coupled plasma ; Lead ; Metal recovery ; Scanning electron microscopy ; Shrinkage ; Silicates ; Spectrum analysis ; Electron energy loss spectroscopy
  8. Source: Journal of Nuclear Materials ; Volume 389, Issue 3 , 2009 , Pages 427-431 ; 00223115 (ISSN)
  9. URL: https://www.sciencedirect.com/science/article/pii/S0022311509003821