纳米球状碳酸钙对水中铀酰离子的吸附

Sorption of UO_2^(2+) Onto Calcium Carbonate Nanoparticles

在添加剂聚苯乙烯磺酸钠(PSS)作用下合成了纳米球状CaCO3,并使用扫描电镜(SEM)对其形貌进行表征。通过静态批实验的方法研究了pH值、离子强度、温度等因素对铀酰离子在纳米球状CaCO3上吸附的影响。结果表明:铀酰离子的吸附率随体系pH的增大而升高,随体系离子强度的增大而降低;温度增加时,纳米球状CaCO3对铀酰离子的平衡吸附量明显增加。热力学研究表明,UO22+在纳米球状CaCO3上的吸附反应是吸热自发进行的。

Calcium carbonate nanoparticles were prepared in the presence of poly（styrene sulfonate） （PSS）. The samples were characterized by scanning electron microscopy （SEM）. The sorption of UO2/2＋ onto CaCOs nanoparticles was investigated as a function of pH, ionic strength and temperature under ambient conditions using batch technique. The results indi- cate that sorption of UO2/2＋ onto CaCO3 nanoparticles increases with increasing pH and decreasing ionic strength. With increasing temperature, maximum adsorption of UO2/2＋ increases. The thermodynamic data indicate that the sorption of UO2/2/＋ onto CaCO3 nanoparti- cles is an endothermic and spontaneous process.