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KMID : 1059520210650030197
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Journal of the Korean Chemical Society
2021 Volume.65 No. 3 p.197 ~ p.202
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Study on Adsorption of PO4 3--P in Water using Activated Clay
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Hwang Ji-Young
Jin Ye-Ji
Ryoo Keon-Sang
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Abstract
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In this study, activated clay treated with H2SO4 (20% by weight) and heat at 90 o C for 8 h for acid white soil was used as an adsorbent for the removal of PO4 3 -P in water. Prior to the adsorption experiment, the characteristics of activated clay was examined by X-ray Fluorescence Spectrometry (XRF) and BET surface area analyser. The adsorption of PO4 3--P on activated clay was steeply increased within 0.25 h and reached equilibrium at 4 h. At 5 mg/L of low PO4 3--P concentration, roughly 98% of adsorption efficiency was accomplished by activated clay. The adsorption data of PO4 3--P were introduced to the adsorption isotherm and kinetic models. It was seen that both Freundlich and Langmuir isotherms were applied well to describe the adsorption behavior of PO4 3--P on activated clay. For adsorption PO4 3--P on activated clay, the Freundlich and Langmuir isotherm coefficients, KF and Q, were found to be 8.3 and 20.0 mg/g, respectively. The pseudo-second-order kinetics model was more suitable for adsorption of PO4 3--P in water/activated clay system owing to the higher correlation coefficient R2 and the more proximity value of the experimental value qe,exp and the calculated value qe,cal than the pseudo-first-order kinetics model.
The results of study indicate that activated clay could be used as an efficient adsorbent for the removal of PO4 3 -P from water.
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KEYWORD
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Activated clay, Acid white soil, Adsorption, Isotherm, PO4 3--P
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