Journal of Korean Society of Water Science and Technology (한국수처리학회지)

Korean Society of Water Science and Technology (한국수처리학회)
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Characteristics of a Thermal-treated Attapulgite for Fluoride Removal from Water

열처리된 Attapulgite를 이용한 수중 불소의 흡착 제거 특성

  • Seo, Eun-Jin (Department of Bioresources & Rural systems Engineering, Hankyong National University) ;
  • Kim, Mun-Ju (Department of Bioresources & Rural systems Engineering, Hankyong National University) ;
  • Park, Seong-Jik (Department of Bioresources & Rural systems Engineering, Hankyong National University)
  • 서은진 (한경대학교 지역자원시스템공학과) ;
  • 김문주 (한경대학교 지역자원시스템공학과) ;
  • 박성직 (한경대학교 지역자원시스템공학과)
  • Received : 2018.06.04
  • Accepted : 2018.06.24
  • Published : 2018.06.30
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Abstract

In this study, fluoride removal using attapulgite (ATTP) was investigated and thermal treatment was performed on the ATTP to improve its adsorption capacity of fluoride. Adsorption experiments were performed under batch conditions. Fluoride adsorption capacity of thermally treated attaplugites increased with increasing thermal treatment temperature and showed the highest adsorption capacity at $700^{\circ}C$ (ATTP-700). As a result of kinetic experiment and model analysis, fluoride adsorption on ATTP-700 reached equilibrium after 6 hours and adsorption rate was mainly influenced by chemical adsorption. The equilibrium adsorption experiment showed that the maximum fluoride adsorption amount of ATTP-700 was 4.85 mg/g and was more suitable for the Langmuir model than the Freundlich model. Thermodynamic adsorption experiments showed that fluoride adsorption of ATTP-700 was endothermic and non spontaneous. Highest fluoride adsorption was achieved at pH 3. As the increase of ATTP-700 dose, the percentage of fluoride removal increased, but the amount of fluoride removal per unit mass of the adsorbent was reduced. Different molar fraction of phosphate and fluoride showed that phosphate adsorption onto ATTP-700 was more favorable than fluoride adsorption. ATTP-700 is inexpensive but highly effective for the removal of fluoride from water.

Keywords

Acknowledgement

Supported by : 농림수산식품기술기획평가원

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