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Bulletin of the Korean Chemical Society (BKCS)

ISSN 0253-2964(Print)
ISSN 1229-5949(Online)
Volume 35, Number 8
BKCSDE 35(8)
August 20, 2014 

 
Title
Evaluation of Loess Capability for Adsorption of Total Nitrogen (T-N) and Total Phosphorous (T-P) in Aqueous Solution
Author
Daeik Kim, Keon Sang Ryoo*, Yong Pyo Hong, Jong-Ha Choi
Keywords
T-P, T-N, Loess, Adsorption, Isotherm
Abstract
The aim of the present study is to explore the possibility of utilizing loess for the adsorption of total phosphorous (T-P) and total nitrogen (T-N) in water. Batch adsorption studies were performed to evaluate the influences of various factors like initial concentration, contact time and temperature on the adsorption of T-P and T-N. The adsorption data showed that loess is not effective for the adsorption of T-N. However, loess exhibited much higher adsorption capacity for T-P. At concentration of 1.0 mg L−1, approximately 97% of TP adsorption was achieved by loess. The equilibrium data were fitted well to the Langmuir isotherm model. The pseudo-second-order kinetic model appeared to be the better-fitting model because it has higher R2 compared with the pseudo-first-order and intra-particle kinetic model. The theoretical adsorption equilibrium qe,cal from pseudo-second-order kinetic model was relatively similar to the experimental adsorption equilibrium qe,exp. The thermodynamic parameters such as free energy ΔG, the enthalpy ΔH and the entropy ΔS were also calculated.
Page
2471 - 2476
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