TY - JOUR
TI - Thermodynamic and kinetics studies of the adsorption of phosphorus by bioretention media
AU - Mei Ying
AU - Yang Xiao-Hua
AU - Guo Ya-Nan
AU - He Jun
AU - Jiang Rong
AU - Li Yu-Qi
AU - Li Jian-Qiang
JN - Thermal Science
PY - 2012
VL - 16
IS - 5
SP - 1506
EP - 1509
PT - Article
AB - The objective of this study is to explore the mechanism of phosphorus  adsorption in the bioretention media. The phosphorus adsorption  characteristics of four media of bioretention are studied by four isothermal  adsorption experiments. The result indicate that the maximal adsorption  capacity (qm) of phosphorus of the four bioretention media are found to be  media I (0.3365 mg/g), media II (0.3302 mg/g), media III (0.2751 mg/g) and  media IV 0.8435 mg/g), respectively. The negative values of Gibbs free energy  of phosphorus indicate that each of the phosphorus adsorption process by the  four bioretention media is a spontaneous process. The mean sorption energies  obtained from DR isotherm were 0.0758, 0.0772, 0.0803 and 0.0632 kJ/mol  respectively, which indicate the physical nature of the adsorbate/adsorbent  interactions. Two kinetic models including pseudo first-order and pseudo  second-order equation were selected to follow the adsorption process. The  results showed that the adsorption of phosphorus with the four types of  bioretention media could be described by the pseudo second-order equation.  The media IV was the better media of bioretention with high phosphorus  removal capacity.