Hydrolysis kinetics of lead silicate glass in acid solution

Rahimi, Rafi Ali; Sadrnezhaad, S.K.; Raisali, Gholamreza; Hamidi, Amir

doi:10.1016/j.jnucmat.2009.02.028

Cited by 8 publications

(7 citation statements)

References 18 publications

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“…Micrographic comparison of the totally shaved S3 specimen ( Figure 4[a]) and the partially covered S30 specimen ( Figure 4[b]) indicates the adherence to the surface of the gel layer during the corrosion test. 17 Negligible to small weight-loss data illustrated in Figure 1 (for the S1, S2, S10, and S20 chenks) are consistent with the micrographs given in Figure 3. Samples having titania and zirconia together with the lower to medium Pb+K+Na (S1 and S2 specimens) exhibit a much lower corrosion effect than the lowsilica, high-Pb+K+Na specimens (S3 and S30).…”

Section: Corrosion-september 2012supporting

confidence: 79%

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Effects of Ion-Exchange and Hydrolysis Mechanisms on Lead Silicate Glass Corrosion

Rahimi¹,

Sadrnezhaad²

2012

Corrosion

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Corrosion of lead silicate glass (LSG) contacting 0.5 M aqueous nitric acid (HNO 3 ) was investigated via scanning electron microscopy, energy-dispersive spectroscopy, inductively coupled plasma analysis, and weight-loss measurement to determine the respective contributions of the ion-exchange vs. the hydrolysis reactions. The LSG having X M ≡ Pb + K + Na Si mole ratios of less than 0.7 showed very little weight loss with no Si network deterioration. At X M > 0.7, the mechanism changed into the hydrolysis, which caused the formation of a networkless gel layer resting at the solid/liquid interface. Addition of titania (TiO 2 ) and zirconia (ZrO 2 ) had disparate effects: X M < 0.7 improved corrosion resistance; while X M > 0.7 caused detrimental consequences.

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Section: Corrosion-september 2012supporting

confidence: 79%

“…Interdiffusion of H + , Pb 2+ , and other soluble ions are also affected by the silica content of the LSG, the pH of the solution, titanium and zirconium additives, and the presence of the alkaline elements. [15][16][17] Quantity and composition of the corrosion products may influence the effectiveness of the competing reactions.…”

Section: Introductionmentioning

confidence: 99%

Effects of Ion-Exchange and Hydrolysis Mechanisms on Lead Silicate Glass Corrosion

Rahimi¹,

Sadrnezhaad²

2012

Corrosion

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“…For higher Pb contents, from 25 to 70 mol %, diffusion coefficients of more than 4 orders of magnitude higher were obtained in glasses altered in 0.1 or 0.5 N HNO 3 solutions. 8,10 A percolation mechanism through the plumbate subnetwork was observed at 40 °C. 10 Binary lead silicate glasses with PbO starting from an approximately 33 mol % content had a diffusion coefficient increasing by about 1 order of magnitude when PbO content increased by 5%.…”

Section: Environmental Science and Technologymentioning

confidence: 97%

“…Numerous empirical studies have been carried out to examine the Pb leaching from glass or from glass ceramic in reactive environments, particularly in contact with different actual beverages or simple synthetic solutions such as acetic acid or nitric acid [6][7][8][9][10][11][12][13][14][15][16][17][18][19][20] . In commercial lead crystal glasses, it has generally been observed that the release of alkalis and Pb ions exhibited a square root time dependence through a diffusion process 11,15,17,18 .…”

Section: Introductionmentioning

confidence: 99%

“…Numerous empirical studies have been carried out to examine the Pb leaching from glass or from glass ceramic in reactive environments, particularly in contact with different actual beverages or simple synthetic solutions such as acetic or nitric acid. − In commercial lead crystal glasses, it has generally been observed that the release of alkalis and Pb ions exhibited a square root time dependence through a diffusion process. ,,, Their leaching kinetics usually increase with the temperature and with the acetic acid concentration . During successive contacts, a decrease in the release of Pb has been observed with each additional solution contact .…”

Section: Introductionmentioning

confidence: 99%

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Structure and Chemical Durability of Lead Crystal Glass

Angeli

Jollivet

Charpentier

et al. 2016

Environ. Sci. Technol.

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Silicate glasses containing lead, also called lead crystal glasses, are commonly used as food product containers, in particular for alcoholic beverages. Lead's health hazards require major attention, which can first be investigated through the understanding of Pb release mechanisms in solution. The behavior of a commercial crystal glass containing 10.6 mol % of PbO (28.3 wt %) was studied in a reference solution of 4% acetic acid at 22, 40, and 70 °C at early and advanced stages of reaction. High-resolution solid-state O andSi NMR was used to probe the local structure of the pristine and, for the first time, of the altered lead crystal glass. Inserted into the vitreous structure between the network formers as Si-O-Pb bonds, Pb does not form Pb-O-Pb clusters which are expected to be more easily leached. A part of K is located near Pb, forming mixed Si-O-(Pb,K) near the nonbridging oxygens. Pb is always released into the solution following a diffusion-controlled dissolution over various periods of time, at a rate between 1 and 2 orders of magnitude lower than the alkalis (K and Na). The preferential release of alkalis is followed by an in situ repolymerization of the silicate network. Pb is only depleted in the outermost part of the alteration layer. In the remaining part, it stays mainly surrounded by Si in a stable structural configuration similar to that of the pristine glass. A simple model is proposed to estimate the Pb concentration as a function of glass surface, solution volume, temperature, and contact time.

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