离子强度、pH和腐殖酸浓度对^(63)Ni(Ⅱ)在γ-Al_2O_3上吸附的影响  

Effect of Ionic Strength,Temperature and Humic Substances Concentration on the Sorption of ^(63)Ni(Ⅱ) to γ-Al_2O_3

作　　者：刘正杰[1] 陈磊[1] 董云会[1] 李月云[1] 胡君[2] 王平[1] 

机构地区：[1]山东理工大学化工学院,山东淄博255049 [2]中国科学院等离子体物理研究所,安徽合肥230031

出　　处：《核化学与放射化学》2012年第6期369-373,共5页Journal of Nuclear and Radiochemistry

基　　金：国家自然科学基金资助项目(21107115);山东省自然科学基金资助项目(ZR2009BM045)

摘　　要：采用静态批式法研究了63 Ni(Ⅱ)在γ-Al2O3上的吸附行为。探讨了震荡时间、pH、离子强度、γ-Al2O3浓度以及腐殖酸对吸附的影响。实验结果表明:在低pH条件下,离子强度对63 Ni(Ⅱ)的吸附影响很大,63 Ni(Ⅱ)的吸附主要是离子交换和外层表面络合作用;在高pH条件下,63 Ni(Ⅱ)的吸附受pH影响较小,63 Ni(Ⅱ)的吸附主要是内层表面络合作用。溶液中的腐殖酸,在低pH条件下促进63 Ni(Ⅱ)在γ-Al2O3上的吸附,而在高pH条件下抑制63 Ni(Ⅱ)在γ-Al2O3上的吸附。The sorption of 6aNi（ Ⅱ） on r-A1203 was studied by using batch technique. The effect of contact time, pH, ionic strength, r-A12Oa content and humic acid on the sorption of 63Ni（Ⅱ） on r-Al2O3 was investigated under ambient conditions. The results suggest that the sorption of 63Ni（Ⅱ） is strongly dependent on ionic strength at low pH values, and independ- ent on it at high pH values. The sorption of 63Ni（ Ⅱ ） at low pH is mainly dominated by ion exchange and/or outer-sphere surface complexation, whereas the sorption of 83 Ni（Ⅱ ） at high pH is mainly dominated by inner-sphere surface complexation. The presence of humic acid enhances 63Ni（ Ⅱ ） sorption to HA-r-A1203 hybrids at low pH values, but reduces 63Ni（Ⅱ） sorption to HA-r-AlzO3 hybrids at high pH values.

关 键 词：r-A1203 吸附63Ni(Ⅱ) 腐殖酸 

分 类 号：TL942.1[核科学技术—辐射防护及环境保护]