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Environmental Engineering Research 2012;17(3): 133-138. DOI: https://doi.org/10.4491/eer.2012.17.3.133
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
Received: December 3, 2011;  Accepted: August 2, 2012.
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ABSTRACT
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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