铀酰离子光化学研究——Ⅰ.Ar~+激光对UO_2(NO_3)_2-C_2H_5OH-HNO_3体系U(Ⅵ)的光化学还原
STUDIES ON THE PHOTOCHEMISTRY OF URANYL ION Ⅰ. PHOTOCHEMICAL REDUCTION OF U(Ⅵ)IN UO_2(NO_3)2-C_2H_5OH-HNO_3 SYSTEM WITH IRRADIATION OF AN ARGON ION LASER
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摘要: 利用氩离子激光器的4880A激光照射UO_2(NO_3)_2-C_2H_5OH-HNO_3溶液体系,研究了乙醇浓度、硝酸浓度、铀(Ⅵ)浓度和温度对铀(Ⅳ)表观量子产额φ的影响。0.01MUO_2(NO_3)_2-1.5MC_2H_5OH-0.5MHNO_3溶液驱氧并保持在氮气氛下光照,φ最高可达0.8左右。当HNO_3浓度大于1.0M时,φ的下降与体系中形成HNO_2有关。对比了加入氨磺酸条件下的实验结果。初步讨论了可能的光化还原U(Ⅵ)-U(Ⅳ)的反应机制。Abstract: Photochemical reduction of uranyl ion by ethanol is investigated using an argon ion laser at wave-length 4880 A. The effects of concentrations of ethanol, nitric acid, uranyl ion and of the temperature on apparent quantum yield of U (Ⅳ) formed are studied. When the deoxygenated sample-solution [0.01M UO2(NO3)2-1.5M C2H5OH-0.5M HNO3] is irradiated in nitrogen atmosphere, the maximum quantum yield φ reaches nearly .0.8. As [HNO3] 1.0M,φ decreases with the increase of nitric acid concentration because of the formation of nitrous acid. Experimental results in systems with the presence and absence of sulfamic acid as a suppressor of nitrous acid are obtained. A preliminary discussion is made on the possible mechanism of the photochemical reduction.
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Keywords:
- Uranyl ion /
- Ethanol /
- Photochemical reduction /
- Quantum yield /
- Possible reaction mechanism /
- Disproportionation.
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