Journal of Korean Society on Water Environment (한국물환경학회지)

Korean Society on Water Environment (한국물환경학회)
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The Effect of Phosphate Desorption Solution on LDH (Layered Double Hydroxide) Desorption

탈착 용액의 조성변화가 층상이중수산화물에 흡착된 인 탈착에 미치는 영향

  • Jung, Yong-Jun (Department of Environmental Engineering, Catholic University of Pusan)
  • 정용준 (부산가톨릭대학교 환경공학과)
  • Received : 2007.05.01
  • Accepted : 2008.10.14
  • Published : 2008.11.30
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Abstract

Batch type adsorption and desorption tests were performed with different types (Powder, Granule) of Layered double hydroxides (LDHs) saturated with phosphate. The adsorption isotherm was approximated as a modified Langmuir type equation. The maximum adsorption capacity was 55 mg-P/g-LDH for powder type LDH, and 46 mg-P/g-LDH for granule type LDH. The highest phosphate desorption (79.6%) was obtained with 20% NaOH solution, whereas the desorption degrees were 4.8, 22.2% and 46.7% in the solutions of acidic condition (pH 4), 30% NaCl, and 3% NaOH, respectively. It was suggested that the optimal condition for the phosphate desorption from LDH was 30% NaCl + 3~6% NaOH solutions. The desorption characteristics of LDH was little influenced by adsorbent type.

Keywords

References

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