| Immobilization of Layered Double Hydroxide into Polyvinyl
Alcohol/Alginate Hydrogel Beads for Phosphate Removal |
| Yong-Un Han1, Chang-Gu Lee1, Jeong-Ann Park1, Jin-Kyu Kang1, In Lee1, and Song-Bae Kim2† |
1Environmental Functional Materials & Biocolloids Laboratory,Seoul National University,Seoul 151-921, Korea
2Department of Rural Systems Engineering/Research Institute for Agriculture and Life Sciences, Seoul National University, Seoul 151-921, Korea |
Corresponding Author:
Song-Bae Kim ,Tel: +82-2-880-4587, Fax: +82-2-873-2087, Email: songbkim@snu.ac.kr
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Received: December 3, 2011; Accepted: August 2, 2012. |
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| ABSTRACT |
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Polyvinyl alcohol/alginate hydrogel beads containing Mg-Al layered double hydroxide (LDH-PVA/alginate beads) were synthesized
for phosphate removal. Results showed that blending PVA with the LDH-alginate beads significantly improved their stability in a phosphate
solution. The kinetic reaction in LDH-PVA/alginate beads reached equilibrium at 12 hr-post reaction with 99.2% removal. The
amount of phosphate removed at equilibrium (qe) was determined to be 0.389 mgP/g. The equilibrium data were described well by the
Freundlich isotherm with the distribution coefficient (KF, 0.638) and the constant (n, 0.396). Phosphate removal in LDH-PVA/alginate
beads was not sensitive to solution pH. Also, the removal capacity of LDH-PVA/alginate beads (qe, 1.543 mgP/g) was two orders of
magnitude greater than that of PVA/alginate beads (qe, 0.016 mgP/g) in column experiments. This study demonstrates that LDH-PVA/
alginate beads with a higher chemical stability against phosphate compared to LDH-alginate beads have the potential for phosphate
removal as adsorptive media. |
| Keywords:
Column experiment | Layered double hydroxide | Phosphate removal | Polyvinyl alcohol | PVA/alginate beads |
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