The study of the charge transfer reaction of the UVI-UV couple on the rotating gold disc electrode

Detection of uranium(VI) in aqueous solution by a calix[6]arene modified electrode

“…It was found that in strongly acidic solutions (i.e., pH 62) the decomposition of U(V) was enhanced and therefore the anodic wave of U(V) to U(VI) decreased [27,[31][32][33][34]. Kuta and Yeager studied the redox mechanism of uranyl on a gold electrode in perchlorate solution, and thoroughly reported on similar findings [35,36]. To ensure that the limiting current of U(VI) reduction was exclusively dictated by diffusion, we also performed our electrochemical experiments at slightly acidic conditions.…”

Electrochemical studies of U(VI)/U(V) in saturated Na2CO3solution at gold nanoparticles embedded CTA-modified electrode

“…Electrochemical reactions of uranyl complexes have been studied extensively in aqueous [1][2][3][4][5][6][7] and non-aqueous [8][9][10][11][12][13][14][15] solutions and reduction mechanisms have been proposed. In aqueous solution, one electron reduction of UO 2 2+ gives UO 2 + , which is unstable and undergoes disproportionation yielding UO 2 2+ and U 4+ .…”

“…Electrochemical and spectroscopic methods have been used by several authors to demonstrate the presence of stable [UO 2 (CO 3 ) 3 ] 5− in carbonate solution [19][20][21][22][23][24][25][26][27]. Uranyl ions (UO 2 2+ and UO 2 + ) are strongly complexed by CO 3 2− in aqueous solution [28][29][30] 3 4− to UO 2 (CO 3 ) 3 5− at mercury electrode in carbonate solution [6]. Mizuguchi et al showed that a stable UO 2 (CO 3 ) 3 5− complex was formed by the quasireversible reduction of UO 2 (CO 3 ) 3 4− in carbonate solution at Pt working electrode [20].…”

“…Uranyl ions (UO 2 2+ and UO 2 + ) are strongly complexed by CO 3 2− in aqueous solution [28][29][30] 3 4− to UO 2 (CO 3 ) 3 5− at mercury electrode in carbonate solution [6]. Mizuguchi et al showed that a stable UO 2 (CO 3 ) 3 5− complex was formed by the quasireversible reduction of UO 2 (CO 3 ) 3 4− in carbonate solution at Pt working electrode [20]. The irreversibility of UO 2 (CO 3 ) 3 4− /UO 2 (CO 3 ) 3 5− couple suggests that a significant conformational change occurs on one electron reduction of UO 2 (CO 3 ) 3 4− .…”

“…Mizuguchi et al showed that a stable UO 2 (CO 3 ) 3 5− complex was formed by the quasireversible reduction of UO 2 (CO 3 ) 3 4− in carbonate solution at Pt working electrode [20]. The irreversibility of UO 2 (CO 3 ) 3 4− /UO 2 (CO 3 ) 3 5− couple suggests that a significant conformational change occurs on one electron reduction of UO 2 (CO 3 ) 3 4− . The linear [O−An−O] 2+ configuration is retained when there is a one-electron reduction of these ions [32].…”