| 斜发沸石对模拟核素Sr2+的吸附/解吸动力学研究 |
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| 引用本文： | 刘爱平,冯启明,王维清,刘岁海,汪惠.斜发沸石对模拟核素Sr2+的吸附/解吸动力学研究[J].矿物学报,2012,32(2):227-232. |
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| 作者姓名： | 刘爱平 冯启明 王维清 刘岁海 汪惠 |
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| 作者单位： | 1. 西南科技大学固体废物处理与资源化省部共建教育部重点实验室,四川绵阳521010 西南科技大学环境与资源学院,四川绵阳621010
2. 西南科技大学环境与资源学院,四川绵阳,621010 |
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| 基金项目： | 西南科技大学固体废物处理与资源化省部共建教育部重点实验室项目 |
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| 摘 要： | 以Sr（NO3）2为核素源、新疆富蕴县所产斜发沸石为吸附剂,研究斜发沸石对Sr2＋的动力吸附/解吸效果。探讨吸附时间、Sr2＋初始浓度与吸附量的关系以及吸附机理。用pH=6的水溶液对饱和吸附了Sr2＋的斜发沸石进行解吸。结果表明：斜发沸石对Sr2＋的吸附在4 h能达到最大吸附率的99%,Freundlich吸附等温式能对吸附曲线进行很好的描述,单位质量沸石对Sr2＋的最大吸附量为38.34 mg/g,以阳离子交换吸附为主。4.5 h后解吸率为1.78%,解吸速率远小于吸附速率,解吸量与解吸时间的自然对数呈现明显的线性关系,用Elovich方程对解吸曲线进行拟合,R=0.9994,拟合方程为：qt=0.03375＋0.11916lnt。理论上将5%的Sr2＋解吸出来约需5044 d。该斜发沸石固Sr2＋能力很强,对于处理含Sr2＋放射性废液具有重要的意义。
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| 关 键 词： | 斜发沸石 Sr2+ 动力吸附/解吸 阳离子交换 |
Kinetics of Simulated Nuclide Sr^2＋ Adsorption and Desorption by Clinoptilotite |
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| LIU Ai-ping,FENG Qi-ming,WANG Wei-qing,LIU Sui-hai,WANG Hui.Kinetics of Simulated Nuclide Sr^2＋ Adsorption and Desorption by Clinoptilotite[J].Acta Mineralogica Sinica,2012,32(2):227-232. |
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| Authors: | LIU Ai-ping FENG Qi-ming WANG Wei-qing LIU Sui-hai WANG Hui |
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| Institution: | 1.Key Laboratory of Solid Waste Treatment and Resource Recycle of Southwest University of Science and Technology,Mianyang 621010,China;2.College of Environment and Resources,Southwest University of Science and Technology,Mianyang 621010,China) |
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| Abstract: | With Sr(NO3)2 for nuclide source and clinoptilotite from Xinjiang Autonomous Region for adsorbent,kinetics of Sr2+ adsorption and desorption by clinoptilotite was studied.Adsorption mechanism and the relationships between adsorption time,Sr2+ initial concentration and the adsorption quantity were discussesed,respectively.In solution of HCl pH=6,clinoptilotite with saturated Sr2+ begin to desorb.The results show that the Sr2+ adsorption by clinoptilotite for 4 h can reach the maximum at adsorption rate of 99%.Adsorption curve is fitted with Freundlich isotherm well.The maximum adsorption capacity is 38.34 mg/g,and adsorption is cation exchange adsorption principally.After 4.5 h,desorption rate is 1.78%.Desorption speed is far less than that of adsorption.Desorption capacity and the natural logarithms of desorption time have obvious linear relation.Elovich equation was used for fitting desorption curve,R=0.9994,and the regression equation is qt=0.03375+ 0.11916lnt.For desorption of 5% Sr2+,theoretically time is 5044 days.Clinoptilotite has strong ability to adsorb Sr2+ and is of vital significance for treating Sr2+ contained radioactive waste liquid. |
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| Keywords: | elinoptilotite Sr^2 + adsorbing & desorbing kinetics cation exchange |
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