Removal of Cs1+, Sr2+ and Co2+ from aqueous solutions by adsorption on natural clinoptilolite
Removal of Cs1+, Sr2+ and Co2+ from aqueous solutions by adsorption on natural clinoptilolite
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DOI：
10.1016/j.clay.2006.08.004
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发表时间：
2007
影响因子：
5.6
通讯作者：
I. Smičiklas;S. Dimović;I. Plećaš
中科院分区：
文献类型：
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作者：
I. Smičiklas;S. Dimović;I. Plećaš
采用间歇平衡技术研究了塞尔维亚本土斜发沸石对Cs+、Co2+、Sr2+的吸附性能。研究和讨论了平衡时间、初始金属离子浓度、溶液pH和EDTA的存在对这些性能的影响。动力学数据符合准二级动力学模型。CS+较好地被天然斜发沸石吸附，其次是Sr2+和Co2+。用朗缪尔吸附等温式测定了单一金属溶液和混合金属溶液的吸附容量。在pH 3~12范围内，Cs+的吸附几乎不变，而在低pH(2~3)范围内，Cs+的吸附较小。在初始pH为2-10的范围内，对Sr2+的吸附基本保持稳定，而在初始pH>；10时，吸附显著增加。斜发沸石对CS+的吸附不受EDTA的影响，而EDTA的存在阻碍了斜发沸石对Co2+和Sr2+的吸附。
The adsorption properties of local clinoptilolite (Serbia) towards Cs+, Co2+, and Sr2+were investigated by batch equilibration technique. The influence of equilibration time, initial metal cation concentration, solution pH and presence of EDTA on these properties was studied and discussed. Kinetic data were found to be well fitted with pseudo-second order kinetic model. Cs+is preferably adsorbed by the natural clinoptilolite, followed by Sr2+and Co2+. The Langmuir adsorption isotherm was used to determine the adsorption capacities from both single and mixed metal solutions. At pH range of 3–12 the adsorption of Cs+remains almost constant, while at low pH (2–3) the adsorption is lesser. At initial pH range of 2–10 adsorption of Sr2+remains approximately stable, whereas at initial pH>10 adsorption increases significantly. The adsorption of Co2+is low at low pH but increased remarkably with increasing pH and precipitated at pH>8. Cs+adsorption on the clinoptilolite was not affected by the presence of EDTA, while the presence of EDTA hinders the adsorption of Co2+and Sr2+on clinoptilolite.