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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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

Received: 27 January 2021

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X53

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	Articles by authors
	LIU Bing-yi
	LUO Min
	SHAO Yang
	ZHENG Nan
	XU Dian-dou
	LIU Zhi-ming
	MA Ling-ling

Cite this article:

LIU Bing-yi,LUO Min,SHAO Yang等. Preparation of montmorillonite-humic acid complex and study on the adsorption properties for strontium[J]. CHINA ENVIRONMENTAL SCIENCECE, 2021, 41(9): 4204-4210.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2021/V41/I9/4204

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