Environmental Engineering Research

Korean Society of Environmental Engineers (대한환경공학회)
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Immobilization of Layered Double Hydroxide into Polyvinyl Alcohol/Alginate Hydrogel Beads for Phosphate Removal

  • Han, Yong-Un (Environmental Functional Materials & Biocolloids Laboratory, Seoul National University) ;
  • Lee, Chang-Gu (Environmental Functional Materials & Biocolloids Laboratory, Seoul National University) ;
  • Park, Jeong-Ann (Environmental Functional Materials & Biocolloids Laboratory, Seoul National University) ;
  • Kang, Jin-Kyu (Environmental Functional Materials & Biocolloids Laboratory, Seoul National University) ;
  • Lee, In (Environmental Functional Materials & Biocolloids Laboratory, Seoul National University) ;
  • Kim, Song-Bae (Department of Rural Systems Engineering/Research Institute for Agriculture and Life Sciences, Seoul National University)
  • Received : 2011.12.03
  • Accepted : 2012.08.02
  • Published : 2012.09.30
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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 ($q_e$) was determined to be 0.389 mgP/g. The equilibrium data were described well by the Freundlich isotherm with the distribution coefficient ($K_F$, 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 ($q_e$, 1.543 mgP/g) was two orders of magnitude greater than that of PVA/alginate beads ($q_e$, 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.

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References

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