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Phosphorus Adsorption by Layered Double Hydroxide  

Jung, Yong-Jun (환경관리공단 유역관리처)
Min, Kyung-Sok (경북대학교 환경공학과)
Publication Information
Journal of Korean Society of Water and Wastewater / v.19, no.4, 2005 , pp. 404-410 More about this Journal
Abstract
A series of batch type adsorption experiments were performed to remove aquatic phosphorus, where the layered double hydroxide (HTAL-CI) was used as an powdered adsorbent. It showed high adsorption capacity (T-P removal: 99.9%) in the range of pH 5.5 to 8.8 in spite of providing low adsorption characteristics (pH<4). The adsorption isotherm was approximated as a modified Langmuir type equation, where the maximum adsorption amount (50.5mg-P/g) was obtained at around 80mg-P/L of phosphorus concentration. A phosphate ion can occupy three adsorption sites with a chloride ion considering the result that 1 mol of phosphate ion adsorbed corresponded to the 3 moles of chloride ion released. Although the chloride ion at less than 1,000mg-CI/L did not significantly affect the adsorption capacity of phosphate, carbonate ion inhibited the adsorption property.
Keywords
LDH; phosphorus; adsorption; Langmuir isotherm; ion-exchange;
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Times Cited By KSCI : 1  (Citation Analysis)
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