| Fractal-like adsorption kinetics of Pb^2＋ in rocks |
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| 作者单位： | XU Longjun1，ZHOU Zhengguo1，LIU Chenglun1，2，and XIAN Xuefu1 1 Key Laboratory for the Exploitation of Southwestern Resources and Environmental Disaster Control Engineering of Ministry of Education，Chongqing University，Chongqing 400044，China 2 College of Chemistry and Chemical Engineering，Chongqing University，400044，China |
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| 摘 要： | The adsorption kinetics of Pb^2＋ in rocks has been studied using ion selective electrodes and atomic absorption spectrophotometer. The results showed that the adsorption process is a fractal-like reaction. The adsorption rate was relatively high before 30 minutes, and then dropped. The saturated adsorption capacity （a） of Pb^2＋ and kinetic parameters （b, a, D and k） increased with increasing initial concentrations of Pb^2＋. These parameters （except a） decreased while Na^＋ was present in the solution. Furthermore, the smaller the rocks were in grain size, the bigger these kinetic parameters would be, though the parameter a was almost constant.
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| 关 键 词： | 动力学 吸附作用 角砾岩 砂岩 |
| 收稿时间： | 2008-02-20 |
Fractal-like adsorption kinetics of Pb2+ in rocks |
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| Longjun Xu,Zhengguo Zhou,Chenglun Liu,Xuefu Xian. Fractal-like adsorption kinetics of Pb2+ in rocks[J]. Chinese Journal of Geochemistry, 2008, 27(2): 126-129. DOI: 10.1007/s11631-008-0126-y |
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| Authors: | Longjun Xu Zhengguo Zhou Chenglun Liu Xuefu Xian |
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| Affiliation: | [1]Key Laboratory for the Exploitation of Southwestern Resources and Environmental Disaster Control Engineering of Ministry of Education, Chongqing University, Chongqing 400044, China [2]College of Chemistry and Chemical Engineering, Chongqing University, 400044, China |
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| Abstract: | The adsorption kinetics of Pb2 in rocks has been studied using ion selective electrodes and atomic absorption spectrophotometer. The results showed that the adsorption process is a fractal-like reaction. The adsorption rate was relatively high before 30 minutes, and then dropped. The saturated adsorption capacity (a) of Pb2 and kinetic parameters (b, α , D and k) increased with increasing initial concentrations of Pb2 . These parameters (except a) decreased while Na was present in the solution. Furthermore, the smaller the rocks were in grain size, the bigger these kinetic parameters would be, though the parameter a was almost constant. |
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| Keywords: | adsorption kinetics fractal-like sandstone breccia |
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