Wang Rong, Chu Yingying, Chen Mengjun
Water Environ Res. 2017 Sep 1;89(9):791-797. doi: 10.2175/106143017X14902968254593. Epub 2017 May 19.
137Cs+/90Sr2+ adsorption kinetics on natural Ca-bentonite under the impact of different adsorption conditions was examined in detail. The results indicate that natural Ca-bentonite shows a strong adsorption capacity for Cs+/Sr2+. The adsorption reached at equilibrium after 2 hours for Cs+. Cs+/Sr2+removal efficiency reaches the highest when the pH value is 5 to 8 and increases with the increase of Ca-bentonite adding amount. Cs+ removal efficiency increases with the increase of Cs+ initial concentration, while Sr2+ removal efficiency slightly varies around 70%. The adsorption of Cs+/Sr2+ by Ca-bentonite follows the pseudo-second-order model and is controlled by chemical adsorption. Meanwhile, the results of intraparticle diffusion modelling indicate that intraparticle diffusion is a kinetics controlling step, besides surface adsorption and liquid film diffusion.
详细研究了不同吸附条件下天然钙基膨润土对137Cs+/90Sr2+的吸附动力学。结果表明，天然钙基膨润土对Cs+/Sr2+具有较强的吸附能力。Cs+的吸附在2小时后达到平衡。当pH值为5至8时，Cs+/Sr2+的去除效率最高，且随着钙基膨润土添加量的增加而提高。Cs+的去除效率随Cs+初始浓度的增加而增加，而Sr2+的去除效率在70%左右略有变化。钙基膨润土对Cs+/Sr2+的吸附遵循准二级模型，受化学吸附控制。同时，颗粒内扩散模型结果表明，除表面吸附和液膜扩散外，颗粒内扩散是动力学控制步骤。
