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DOI : 10.17640/KSWST.2016.24.3.85 ,    Vol.24, No.3, 85 ~ 95, 2016
Title
Removal of Cu2+, Cd2+ from Water using Thermally Treated Lime Stone
강구 Ku Kang , 구본운 Bon-wun Gu , 김영기 Young-kee Kim , 박성직 Seong-jik Park
Abstract
This study examined the removal of Cu2+ and Cd2+ from water using thermally treated lime stone (TT-LS). Adsorption experiments have been conducted in batch conditions using line stone thermally treated at different temperatures (100~900 ℃). Cation exchange capacity and adsorption capacity of TT-LS slightly increased with increasing thermal treatment temperature, and lime stone thermally treated at 900 ℃ (900TT-LS) was shown to be most effective for the removal of Cu2+ and Cd2+. 900TT-LS with highest removal efficiencies was studied in further experiments. Kinetic adsorption data obey both pseudo first and pseudo second order model. The equilibrium adsorption data for Cu2+ were fitted well to Freundlich isotherm and that for Cd2+ both Freundlich and Langmuir isotherm. The maximum adsorption capacity of 900TT-LS for Cu2+ and Cd2+ were 109.99 mg/g and37.19 mg/g, respectively. The influence of initial solution pH on both Cu2+ and Cd2+ adsorption was insignificant. It was concluded that the 900TT-LS could be used as a cheap and effective adsorbent for the Cu2+ and Cd2+ removal.
Key Words
Copper, Cadmium, Lime Stone, Thermal Treatment, Adsorption.
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