Heterogeneous photocatalytic removal of U(VI) in the presence of formic acid: U(III) formation
Heterogeneous photocatalytic removal of U(VI) in the presence of formic acid: U(III) formation
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DOI：
10.1016/j.cej.2015.01.118
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发表时间：
2015-06
影响因子：
15.1
通讯作者：
Vanesa N. Salomone;J. Meichtry;M. Litter
中科院分区：
文献类型：
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作者：
Vanesa N. Salomone;J. Meichtry;M. Litter
研究了在甲酸（HCOOH）存在下，TiO 2在紫外-可见光下非均相光催化去除铀酰（UO 22+）（0.25mM，pH 3）的效率。分析了铀盐（高氯酸盐和醋酸-硝酸盐）的复配以及石英和玻璃光反应器的使用对反应的影响。在甲酸存在下，U（VI）的转化率显着高，并建立了最佳的去除条件。在石英光反应器中，用0.001 M HCOOH对高氯酸铀酰进行了最高效率的观察，而乙酸铀酰的去除率较低。HCOOH浓度>0.01 M引起铀再氧化。在pH < 2的1 M HCOOH存在下，采用直接分光光度法研究了TiO 2纳米粒子对U（VI）的光催化转化。检测到U（V）、U（IV）和U（III）。U（III）的形成在没有光催化剂的情况下也是明显的。这是首次报道在光化学U（VI）体系中形成U（III）。
The efficiency of TiO2heterogeneous photocatalysis under UV–visible light for removal of uranyl (UO22+) (0.25 mM, pH 3) in the presence of formic acid (HCOOH) was investigated. The effect of the counterion of the uranium salt (perchlorate and acetate–nitrate) and the use of quartz and glass photoreactors were analyzed. The transformation of U(VI) in the presence of HCOOH was significantly high and the best removal conditions have been established. The highest efficiency was observed for uranyl perchlorate in the quartz photoreactor with 0.001 M HCOOH, while uranyl acetate yielded a lower removal. HCOOH concentrations >0.01 M provoked uranium reoxidation. U(VI) photocatalytic transformation was also studied by direct spectrophotometry using TiO2nanoparticles in the presence of 1 M HCOOH at pH < 2. U(V), U(IV) and U(III) were detected. U(III) formation was also apparent in the absence of the photocatalyst. This is the first time that formation of U(III) in a photochemical U(VI) system is reported.