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.
出处
《核化学与放射化学》
CAS
CSCD
北大核心
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)
