摘要
利用静态批式法研究了Eu(Ⅲ)在北山除碳酸盐土壤上的吸附,探讨了体系pH值、固液比、胡敏酸(HA)以及离子强度等因素对吸附的影响,并讨论了其吸附机理。结果表明:pH对Eu(Ⅲ)在北山除碳酸盐土壤表面吸附的影响显著,吸附量在pH=5~6迅速增加;Eu(Ⅲ)吸附量与固液比呈正相关,当m/V>1.2g/L时,吸附接近平衡;Eu(Ⅲ)的吸附量随离子强度的增大而减小;低pH下,Eu(Ⅲ)在北山除碳酸盐土壤表面上可能以离子交换和外层配合吸附为主,而在高pH下则可能主要以内层配合作用为主;在低pH值时,HA促进Eu(Ⅲ)吸附,而高pH时,则对Eu(Ⅲ)的吸附有一定的抑制作用。
The sorption of Eu(Ⅲ) on Beishan decarbonated soil as a function of pH value, solidtoliquid ratio, humic acid (HA) and ionic strength was studied using batch technique. The results indicate that Eu (Ⅲ) sorption to soil is strongly dependent on pH and ionic strength, indicating that the outersphere complexation and ion exchange may be predominant at low pH; whereas, at high pH range, innersphere complexation and/or surface precipitation are prevailing. HA certainly provokes Eu (Ⅲ) sorption to soil under low pH range, but significantly reduces Eu( Ⅲ ) sorption at high pH because of the dissolvable humate complexes in aqueous solution.
出处
《核化学与放射化学》
CAS
CSCD
北大核心
2012年第1期46-50,共5页
Journal of Nuclear and Radiochemistry
基金
国家自然科学人才培养基金资助项目(J1030932)
国家自然科学基金资助项目(20871062)