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KMID : 1024520030120091011
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Journal of the Environmental Sciences
2003 Volume.12 No. 9 p.1011 ~ p.1016
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Adsorption Characteristics of Phosphate, Sulfate, and Copper Ions by Synthesized Goethite
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Kim Jung-Du
Yoo Su-Yong
Moon Myung-Jun
Kam Sang-Kyu
Ju Chang-Sik
Lee Min-Gyu
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Abstract
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Adsorption of phosphate, sulfate, and copper ion to goethite was investigated. Goethite was prepared in the alkaline solution. In the single adsorbate systems, the final equilibrium plateau reached within 20 min. The adsorption isotherms of the individual ions could be well described by the Langmuir equation. The maximum adsorption capacities (qmax/) were calculated as 0.483 m㏖/g and 0.239 m㏖/g at pH 3 for phosphate and sulfate ion, and 0.117 m㏖/g at pH 6 for copper ion, respectively, In competitive adsorption system with phosphate and sulfate, phosphate ion was a stronger competitor for adsorption on goethite than sulfate ion, which was consistent with higher affinity of phosphate ion for the surface compared to sulfate ion. The existence of sulfate ion enhanced the adsorption of copper ion but the adsorption of sulfate was inhibited when copper ion was present.
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KEYWORD
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Goethite, Phosphate ion, Sulfate ion, Copper ion, Adsorption, Competitive adsorption
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