Journal of Korean Society of Water and Wastewater (상하수도학회지)

The Korean Society of Water and Wastewater (대한상하수도학회)
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Enhancement of phosphate removal using copper impregnated activated carbon(GAC-Cu)

Cu(II)를 이용하여 표면개질된 활성탄의 인산염 제거효율 향상

  • Shin, Jeongwoo (Department of Civil Engineering, Sangmyung University) ;
  • Kang, Seoyeon (Department of Civil Engineering, Sangmyung University) ;
  • An, Byungryul (Department of Civil Engineering, Sangmyung University)
  • 신정우 (상명대학교 건설시스템공학과) ;
  • 강서연 (상명대학교 건설시스템공학과) ;
  • 안병렬 (상명대학교 건설시스템공학과)
  • Received : 2021.11.01
  • Accepted : 2021.11.29
  • Published : 2021.12.15
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Abstract

The adsorption process using GAC is one of the most secured methods to remove of phosphate from solution. This study was conducted by impregnating Cu(II) to GAC(GAC-Cu) to enhance phosphate adsorption for GAC. In the preparation of GAC-Cu, increasing the concentration of Cu(II) increased the phosphate uptake, confirming the effect of Cu(II) on phosphate uptake. A pH experiment was conducted at pH 4-8 to investigate the effect of the solution pH. Decrease of phosphate removal efficiency was found with increase of pH for both adsorbents, but the reduction rate of GAC-Cu slowed, indicating electrostatic interaction and coordinating bonding were simultaneously involved in phosphate removal. The adsorption was analyzed by Langmuir and Freundlich isotherm to determine the maximum phosphate uptake(qm) and adsorption mechanism. According to correlation of determination(R2), Freundlich isotherm model showed a better fit than Langmuir isotherm model. Based on the negative values of qm, Langmuir adsorption constant(b), and the value of 1/n, phosphate adsorption was shown to be unfavorable and favorable for GAC and GAC-Cu, respectively. The attempt of the linearization of each isotherm obtained very poor R2. Batch kinetic tests verified that ~30% and ~90 phosphate adsorptions were completed within 1h and 24 h, respectively. Pseudo second order(PSO) model showed more suitable than pseudo first order(PFO) because of higher R2. Regardless of type of kinetic model, GAC-Cu obtained higher constant of reaction(K) than GAC.

Keywords

Acknowledgement

본 연구는 2021학년도 상명대학교 교내연구비를 지원받아 수행하였음.

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