中文摘要：

通过静态实验,研究了不同反应时间、p H值、初始铀浓度、磷酸二氢钠用量、温度等因素对磷酸二氢钠去除溶液中铀的效果的影响,并结合红外光谱、扫描电镜和热重分析等测试结果,探讨了磷酸二氢钠去除铀的机理.结果表明,一定质量的磷酸二氢钠对铀的去除量随着铀初始浓度的增大而增大,随着温度的升高而减小;在p H值为5,磷酸二氢钠用量为2.0 mg时,磷酸二氢钠去除铀的效果最好,铀的去除率高达99%以上;反应在120 min基本达到平衡.红外光谱分析说明磷酸二氢钠主要是通过磷酸二氢根与UO2＋2发生络合反应去除溶液中的铀,扫描电镜分析显示反应生产了矿物晶体,热重分析可知该矿物晶体具有很好的热稳定性.

英文摘要：

By the static experiments, the effects of reaction time, temperature, pH, initial concentration of uranium, dosage of sodium dihydrogen phosphate on the removal of uranium by sodium dihydrogen phosphate were investigated. With the analysis results of infrared spectroscopy, scanning electron microscopy and thermogravimetric analysis, the mechanism of the removal reaction was also studied. The results indicated that the removal capacity of sodium dihydrogen phosphate of uranium increased with the increase of initial concentration of uranium, while descended with the ascent of temperature. When pH was 5 and dosage of sodium dihydrogen phosphate was 2.0 mg, the highest removal efficiency of uranium was obtained, and the removal rate reached 99%. Moreover, the reaction equilibrium was achieved at 120 min. In addition, infrared analysis illustrated that sodium dihydrogen phosphate mainly depended on the strong complexation of dihydrogen phosphate roots to remove uranium. Scanning electron microscopy analysis showed that the reaction produced mineral crystals, and thermogravimetric analysis demonstrated that the mineral crystals had very good thermal stability.