铀酰光化学研究——Ⅳ.镓灯照射UO_2(NO_3)_2-HCOOH-HNO_3体系U(Ⅵ)的光化学还原
STUDIES ON THE PHOTOCHEMISTRY OF URANYL ION Ⅳ.PHOTOCHEMICAL REDUCTION OF U(Ⅵ) IN UO_2~(2+)-HCOOH-HNO_3 SYSTEM WITH GALLIUM LAMP IRRADIATION
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摘要: 本文采用与铀酰离子吸收光谱匹配较好的Ga灯为光化学光源,对UO_2(NO_3)_2-HCOOH,UO_2(NO_3)_2-HCOOH-HCOONa体系光化反应进行了研究,确定了光化反应的反应物和生成物之间的化学计量关系。气相色谱分析结果表明,CO_2与CO的比值约为15:1。在U(Ⅵ)光化学还原过程中,消耗1mol甲酸,则生成1mol四价铀和1mol气体(CO_2+CO),据此推断UO_2~(2+)-HCOOH体系主要的光化学反应方程式为: UO_2~(2+)+HCOO~-+3H~+→U~(4+)+CO_2+2H_2O还研究了各种条件对体系光化学反应的影响。Abstract: The photochemical reactions of uranyl ion in UO2(NO3)2-HCOOH and UO2(NO2)2-HCOOH-HCOONa systems are investigated using gallium lamp as a light source. Its emission spectrum is well consistent with absorption spectrum of uranyl ion in solution at wave length 400 - 420 nm. Analytical results of gas chromatography show that the ratio of CO2 and CO is approximately 15/1.Stoi-chiometric studies of the photochemical reduction show that the mole ratio of produced U(Ⅳ) , gas products and consumed formic acid is 1:1:1. The photochemical reaction equation can be expressed byThe effects of different conditions on the quantity of U(Ⅳ) formed are also reported.
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