Kinetics of lead(IV) oxide (PbO2) reductive dissolution: Role of lead(II) adsorption and surface speciation

Wang, Yin; Wu, Jiewei; Wang, Zimeng; Terenyi, Agnes; Giammar, Daniel E.

doi:10.1016/j.jcis.2012.09.022

Cited by 34 publications

(37 citation statements)

References 43 publications

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“…In this case, water acts as a reducing agent. Such a process is typical for iron, 93 lead, 95 and plutonium 97 compounds.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

“…Based on these results, the reductive dissolution model was proposed for describing experimental data from 2 ≤ pH ≤ 7. This model has been widely discussed in the literature and observed for different compounds. − When the reduced form of a substance is thermodynamically stable, the redox reaction proceeds through interaction with the aqueous medium. In this case, water acts as a reducing agent.…”

Section: Resultsmentioning

confidence: 99%

“…The above model is suitable for description of the pH-dependent dissolution of the substances consisting of elements whose oxidation state does not change upon dissolution [89][90][91] Based on these results, the reductive dissolution model was proposed for describing experimental data from 2 ≤ pH ≤ 7. This model has been widely discussed in the literature, and observed for different compounds [93][94][95][96][97][98] . When the reduced form of a substance is thermodynamically stable, the redox reaction proceeds through interaction with the aqueous medium.…”

Section: Thermodynamic Modeling Of Solubility Datamentioning

confidence: 99%

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Solubility of Nanocrystalline Cerium Dioxide: Experimental Data and Thermodynamic Modeling

et al. 2016

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Ultrafine 5 nm ceria isotropic nanoparticles were prepared using the rapid chemical precipitation approach from cerium(III) nitrate and ammonium hydroxide aqueous solutions. The as-prepared nanoparticles were shown to contain predominantly Ce(IV) species. The solubility of nanocrystalline CeO 2 at several pH values was determined using ICP-MS and radioactive tracer methods. Phase composition of the ceria samples remained unchanged upon partial dissolution, while the shape of the particles changed dramatically, yielding nanorods under neutral pH conditions. According to X-ray absorption spectroscopy investigation of the supernatant, Ce(III) was the main cerium species in solution at pH < 4. Based on the results obtained, a reductive dissolution model was used for data interpretation. According to this model, the solubility product for ceria nanoparticles was determined to be logK sp =-59.3 ± 0.3 in 0.01M NaClO 4. Taken together, our results show that the pH-dependence of ceria anti-and pro-oxidant activity can be related to the dissolution of CeO 2 in aqueous media.

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“…In this case, water acts as a reducing agent. Such a process is typical for iron, 93 lead, 95 and plutonium 97 compounds.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Thermodynamic Modeling Of Solubility Datamentioning

confidence: 99%

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Solubility of Nanocrystalline Cerium Dioxide: Experimental Data and Thermodynamic Modeling

et al. 2016

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“…Reduction rates during the steady state are plotted against hydrazine concentration as shown in Figure 8. On one hand, surface-mediated reactions of dissolution have been shown to be linearly dependent on surface concentration of adsorbed species [29,30].…”

Section: Figure 7 -Hematite Reduction Rate Per Surface Area At Differmentioning

confidence: 99%

Mechanism and kinetics of hematite reduction under typical PWR secondary circuit condition

Chanéac

Berger

et al. 2020

Journal of Nuclear Materials

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Hydrazine is added into secondary circuit in order to eliminate oxygen and to impose a reducing potential. Another possible role of hydrazine is to reduce hematite potentially present and thus reduce risk of stress corrosion cracking of steam generator tubes. However, the latter effect of hydrazine is still not clear. In order to better understand the mechanism and the kinetics of hematite reduction by hydrazine under secondary circuit conditions (275°C, slightly alkaline, diluted hydrazine), an experimental study has been carried out. It was found that the reduction of hematite proceeds through the adsorption of hydrazine, surficial reduction and dissolution of hematite, and coprecipitation of well crystallized octahedral magnetite.

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“…Over many years of use, Pb water pipes slowly develop a layer of protective scale consisting of Pb corrosion products that limit Pb solubility, including PbO2 and Pb(II) minerals, such as pyromorphite and +cerussite, among others 2 . However, this scale is sensitive to water oxidizing conditions and thus, changes in water quality may lead to an increase in Pb solubility, resulting in toxic levels of Pb being released into the drinking water [3][4][5] . Chronic exposure to Pb has serious adverse health effects, particularly in children, including irreversible damage to the central nervous system 6 .…”

Section: Introductionmentioning

confidence: 99%

Preventing leaching from lead water pipes with electrochemistry: an exploratory study

Lobo

Gadgil

2021

Environ. Sci.: Water Res. Technol.

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Kinetics of lead(IV) oxide (PbO2) reductive dissolution: Role of lead(II) adsorption and surface speciation

Cited by 34 publications

References 43 publications

Solubility of Nanocrystalline Cerium Dioxide: Experimental Data and Thermodynamic Modeling

Solubility of Nanocrystalline Cerium Dioxide: Experimental Data and Thermodynamic Modeling

Mechanism and kinetics of hematite reduction under typical PWR secondary circuit condition

Preventing leaching from lead water pipes with electrochemistry: an exploratory study

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