U(VI) removal efficiency by the oxidation of Fe(II) under the only injection of O2 and co-injection of CO2 and O2
U(VI) removal efficiency by the oxidation of Fe(II) under the only injection of O2 and co-injection of CO2 and O2
复制标题
单独注入O2和同时注入CO2和O2时Fe(II)氧化去除U(VI)的效率
DOI：
10.1088/1755-1315/121/2/022014
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发表时间：
2018-02
期刊：
影响因子：
--
通讯作者：
Xiaoyan Wu
中科院分区：
文献类型：
--
作者：
Yingfeng Luo;Yanpei Xie;Qi Fang;Shuliang Zou;Mi Li;Went Tan;Xiaoyan Wu
通过间歇实验考察了单独充氧和CO2与O2混合充氧条件下Fe(II)氧化去除U(VI)的效果。实验结果表明，在单独注入O2的情况下，Fe(II)和O2的协同作用可以有效地去除溶液中的U(VI)。在中性条件下，Fe(II)的初始浓度分别为2、5、10、25、50、100 mg/L时，U(VI)的去除效率几乎都达到90%以上。U(VI)的去除效率与Fe(II)的初始浓度之间没有必然的相关性，表明U(VI)与铁氧化物的共沉淀对U(VI)的去除起主导作用，而不是简单的吸附在铁氧化物表面。在CO2和O2的共同注入下，生成的碳酸盐离子通过Fe(II)和O2的协同作用对U(VI)的去除效率有显著的影响。U(VI)的去除效率随Fe(II)初始浓度的增加而增加。在碳酸盐存在下，U(VI)容易与HCO3-形成UO2(CO3)20和UO2(CO3)42-等铀酰碳酸盐络合物，阻碍了U(VI)与铁氧化物的吸附和共沉淀过程。
Batch experiments were carried out to investigate the U(VI) removal efficiency by the oxidation of Fe(II) under the only injection of O2 and co-injection of CO2 and O2. Experiment results show that under the only injection of O2, the synergistic effect of Fe(II) and O2 could effectively remove U(VI) from the solution. For the different initial concentrations of Fe(II) at 2, 5, 10, 25, 50, 100 mg/L, almost all the removal rates of U(VI) reach up to 90% in the neutral conditions. There is no inevitable correlation between the removal efficiency of U(VI) and the initial concentration of Fe(II), revealing that the coprecipitation of U(VI) with Fe-oxides plays a dominant role in the removal of U(VI) rather than the simple sorption to the surface of Fe-oxides. Under the co-injection of CO2 and O2, the generated carbonate ions have a significant effect on the removal efficiency of U(VI) by the synergistic effect of Fe(II) and O2. The removal efficiency of U(VI) increases with the initial concentration of Fe(II). In the presence of carbonate ions, U(VI) is easy to bind with HCO3- to form uranyl carbonate complexes such as UO2(CO3)20 and UO2(CO3)42-, which would hinder the process of sorption and co-precipitation of U(VI) with Fe-oxides.
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