caa a22 4500 475761901 CHVBK 20180406123553.0 cr unu---uuuuu 170329e20000201xx s 000 0 eng 10.1007/BF02494673 doi (NATIONALLICENCE)springer-10.1007/BF02494673 Reduction of the photoexcited uranyl ion by water [Elektronische Daten] 1. UIV and H2O2 formation [A. Yusov, V. Shilov] Photooxidation of water by the uranyl ion was studied. Solutions of uranyl in 0.01-4.0M H2SO4, HClO4, or 0.1-1.0M Na2SO4 and NaClO4 containing "lacunary” heteropolytungstate (HPT) K10P2W17O61 or K8SiW11O39 were irradiated with a nitrogen laser, a mercury or xenon lamp, or visible light. Spectrophotometric analysis showed that the irradiation results in the accumulation of UIV. Simultaneously the formation of H2O2 proceeds. The quantum yield Φ of the reaction increases as the concentration of the acid or salt increases. For aerated solutions of 1M H2SO4 or 1M HClO4, irradiation by light with λ=337.1 Φ is close to (1.5-2)·10−3. The irradiation of solutions with pH −4 for many days leads to an almost quantitative transformation of UO2 2+ into UIV. When the irradiation was carried out in the absence of HPA, UIV was not detected, although hydrogen peroxide was observed in the solution. Kluwer Academic/Plenum Publishers, 2000 uranyl nationallicence photochemistry nationallicence photochemical reaction nationallicence redox reaction nationallicence heteropolytungstate anions nationallicence tungstophosphate nationallicence tungstosilicate nationallicence Yusov A. Institute of Physical Chemistry, Russian Academy of Sciences, 31 Leninsky prosp., 117915, Moscow, Russian Federation aut Shilov V. Institute of Physical Chemistry, Russian Academy of Sciences, 31 Leninsky prosp., 117915, Moscow, Russian Federation aut Russian Chemical Bulletin Kluwer Academic Publishers-Plenum Publishers 49/2(2000-02-01), 285-290 1066-5285 49:2<285 2000 49 11172 https://doi.org/10.1007/BF02494673 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF02494673 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Yusov A. Institute of Physical Chemistry, Russian Academy of Sciences, 31 Leninsky prosp., 117915, Moscow, Russian Federation aut NATIONALLICENCE 700 1- Shilov V. Institute of Physical Chemistry, Russian Academy of Sciences, 31 Leninsky prosp., 117915, Moscow, Russian Federation aut NATIONALLICENCE 773 0- Russian Chemical Bulletin Kluwer Academic Publishers-Plenum Publishers 49/2(2000-02-01), 285-290 1066-5285 49:2<285 2000 49 11172 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer