Radiation-induced dissolution of colloidal PbO sub 2

Journal Article · Thu Nov 01 04:00:00 EST 1990 · Journal of Physical Chemistry; (USA)

DOI:https://doi.org/10.1021/j100385a016· OSTI ID:6301995

Mulvaney, P; Grieser, F ^[1]; Meisel, D ^[2]

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1. Univ. of Melbourne, Parkville (Australia)
2. Argonne National Lab., IL (USA)

The reduction of Ludox-stabilized colloidal PbO{sub 2} using radiolytically generated viologen radicals (ZV{sup {minus}}) has been studied by using both steady-state {gamma}-radiolysis and pulse radiolysis techniques. The steady-state radiolysis results indicate that reduction of PbO{sub 2} is consistent with the overall reaction PbO{sub 2} + 4H{sup +} + 2ZV{sup {minus}} {yields} Pb{sup 2+} + 2ZV + 2H{sub 2}O. Temporal examination of the reduction process, monitored conductometrically and spectroscopically, reveals that two main steps are involved in the overall reduction process. The first step occurs rapidly and involves a one-electron reduction of a PbO{sub 2} colloid with virtually the simultaneous adsorption of a proton. Once the colloid possesses one electron, the second electron is more difficult to transfer and a slower electron-transfer step occurs consuming, again simultaneously, three protons to produce Pb{sup 2+}.

• OSTI ID: 6301995
• Journal Information: Journal of Physical Chemistry; (USA), Journal Name: Journal of Physical Chemistry; (USA) Vol. 94:22; ISSN JPCHA; ISSN 0022-3654
• Country of Publication: United States
• Language: English

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