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《Environmental Chemistry》 2005-01
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THE ABILITIES AND MECHANISMS OF ADSORPTION PHOSPHORUS IN SOME CLAY MINERLS AND SOILS

YUAN Dong-hai 1 ZHANG Meng-qun 2 GAO Shi-xiang 1 YIN Da-qiang 1 WANG Lian-sheng 1 (1 State Key Laboratory of Waste Control and Resources Reuses, Nanjing University, Nanjing, 210093; 2 Modern Analysis Center, Nanjing University, Nanjing, 210093)  
Clay minerals and soils are important natural resources to be used in all fields including environmental protection. In this paper the abilities and mechanisms of adsorption phosphorus in five clay minerals and two clay soils were studied through experiments on Langmuir adsorption isotherms of phosphorus and analyzing the contents of different type of phosphorus in these materials saturated with phosphorus. Clay minerals and soils had a better performance on removal of phosphorus except kaolinite and zeolite. Vermiculite had a stronger ability of adsorption phosphorus, followed by yellow cinnamon soil, attapulgite, bentonite and xiashu loess. The ability of adsorption phosphorus of these materials was mainly influenced by their composition such as reactive Ca, Fe and Al, so the reactive Ca, Fe and Al can significantly improve the ability of adsorption phosphorus in these materials. The different type of phosphorus in these materials saturated with phosphorus had also closely relationship with their makeup such as total Ca, reactive Ca, Fe, Al. Among these materials including clay minerals and soils saturated with phosphorus in this study, the materials with higher total Ca and reactive Ca had higher calcium phosphate, for the ferric phosphorus and aluminum phosphorus, there were the same trend like this. The clay minerals and soils adsorbed phosphorus through chemical process including specific adsorption and nonspecific adsorption.
【Fund】: 973计划项目 ( 2 0 0 2CB412 3 0 7);; 南京大学污染控制与资源化国家重点实验室开放基金资助 (NJUESK0 3 0 0 5 )
【CateGory Index】: X703
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