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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。
The effect of ethanol concentration, nitric acid concentration, uranium (Ⅵ) concentration and temperature on the apparent quantum yield φ of uranium (Ⅳ) was studied by irradiating UO_2 (NO_3) _2-C_2H_5OH-HNO_3 solution with 4880A laser using argon ion laser. The solution of 0.01MUO_2 (NO_3) _2-1.5MC_2H_5OH-0.5MHNO_3 is driven by oxygen and maintained under a nitrogen atmosphere with a maximum of φ up to about 0.8. When the concentration of HNO 3 is greater than 1.0 M, the decrease of φ is related to the formation of HNO 2 in the system. The experimental results under the condition of adding sulfamic acid were compared. The reaction mechanism of photoperiod U (Ⅵ) -U (Ⅳ) was discussed preliminarily.