蒙脱土-腐殖酸复合体制备及其对锶的吸附性能研究

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摘要为探究土壤胶体对放射性核素锶的吸附机制，选取典型无机矿物蒙脱土和腐殖酸制备有机-无机复合胶体，并研究了其对锶的吸附性能.实验结果表明，人工复合体的腐殖酸负载量可达到2.97%，并且添加腐殖酸会改变蒙脱土的形貌.复合体对锶的吸附量达到6.86mg/g，通过对复合体吸附锶的动力学拟合发现，吸附过程更符合二级动力学模型.吸附过程在10min后到达平衡，低温时去除率更高，15℃时为72.29%.当pH值由5增加到9时，去除率的变化范围在1%~2%之间.而离子强度对吸附有明显的影响，0.1mol/L时去除率较0.001mol/L时的去除率同比下降20%~60%.同时去除率随有机物浓度的增大而提高，从0到60mg/L时去除率快速增长，60mg/L时去除率为75.36%，随后去除率增长进入平缓期.

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	刘冰逸
	罗敏
	邵阳
	郑楠
	徐殿斗
	刘志明
	马玲玲

关键词 ：有机-无机复合体, 锶, 吸附, 蒙脱土, 腐殖酸

Abstract：In order to explore the adsorption mechanism of soil colloids on radionuclide strontium, montmorillonite, one of the typical inorganic minerals, and humic acid were selected to prepare for an organic-inorganic complex, and to explore the adsorption properties. It was found that the humic acid loaded on the complex with a loading of 2.97% can change the morphology of montmorillonite. The adsorption capacity of the artificial complex for strontium was up to 6.86mg/g. By fitting the kinetics of the adsorption of strontium on the complex, the adsorption process was found to be more in line with the second-order kinetic model with the adsorption equilibrium time of 10min. The removal rate was high at low temperature of 15℃ with a rate of 72.29%. When the pH increased from 5 to 9, the removal rate varied between 1%~2%. Ionic strength had a significant effect on adsorption with the removal rate at 0.1mol/L, which was obviously lower than 0.001mol/L with a decreasing rate of 20%~60%. Meanwhile, the removal rate increased with the increasing concentration of humic acid. The removal rate increased rapidly from 0 to 60mg/L, and the highest rate reached 75.36% at 60mg/L, then the rate reached an equilibrium.

Key words： organic-inorganic complex strontium adsorption montmorillonite humic acid

收稿日期: 2021-01-27

PACS:

X53

基金资助:国家自然科学基金项目（U1932103，11875266，U1832212，91643206）

通讯作者: 马玲玲,研究员,malingling@ihep.ac.cn E-mail: malingling@ihep.ac.cn

作者简介: 刘冰逸(1995-),女,辽宁丹东人,硕士研究生,主要研究方向污染物环境行为研究.

引用本文:

刘冰逸, 罗敏, 邵阳, 郑楠, 徐殿斗, 刘志明, 马玲玲. 蒙脱土-腐殖酸复合体制备及其对锶的吸附性能研究[J]. 中国环境科学, 2021, 41(9): 4204-4210. LIU Bing-yi, LUO Min, SHAO Yang, ZHENG Nan, XU Dian-dou, LIU Zhi-ming, MA Ling-ling. Preparation of montmorillonite-humic acid complex and study on the adsorption properties for strontium. CHINA ENVIRONMENTAL SCIENCECE, 2021, 41(9): 4204-4210.

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