Sorption of radionickel to goethite: Effect of water quality parameters and temperature
Sorption of radionickel to goethite: Effect of water quality parameters and temperature
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DOI：
10.1007/s10967-010-0543-3
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发表时间：
2010-04
影响因子：
1.6
通讯作者：
Baowei Hu;W. Cheng;Hui Zhang;G. Sheng
中科院分区：
文献类型：
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作者：
Baowei Hu;W. Cheng;Hui Zhang;G. Sheng
在这项工作中，镍（II）从水溶液中的吸附针铁矿作为各种水质参数和温度的函数进行了研究。结果表明，吸附动力学符合准二级速率方程。镍（II）的吸附针铁矿是强烈依赖于pH值和离子强度。在pH < 8.0时，HA/FA对Ni（II）的吸附有正效应，而在pH > 8.0时，HA/FA对Ni（II）的吸附有负效应。采用Langmuir、Freundlich和D-R模型对293.15 K、313.15 K和333.15 K三个温度下的吸附等温线进行了模拟。通过计算吸附热力学参数（Δ H 0、Δ S 0和Δ G 0），发现吸附过程是自发的吸热过程。在低pH值下，Ni（II）的吸附以针铁矿表面的外球表面络合或与Na+/H+的离子交换为主，而在高pH值下，内球表面络合是主要的吸附机制。
In this work, sorption of Ni(II) from aqueous solution to goethite as a function of various water quality parameters and temperature was investigated. The results indicated that the pseudo-second-order rate equation fitted the kinetic sorption well. The sorption of Ni(II) to goethite was strongly dependent on pH and ionic strength. A positive effect of HA/FA on Ni(II) sorption was found at pH < 8.0, whereas a negative effect was observed at pH > 8.0. The Langmuir, Freundlich, and D-R models were applied to simulate the sorption isotherms at three different temperatures of 293.15 K, 313.15 K and 333.15 K. The thermodynamic parameters (ΔH0, ΔS0and ΔG0) were calculated from the temperature dependent sorption, and the results indicated that the sorption was endothermic and spontaneous. At low pH, the sorption of Ni(II) was dominated by outer-sphere surface complexation or ion exchange with Na+/H+on goethite surfaces, whereas inner-sphere surface complexation was the main sorption mechanism at high pH.