TY - JOUR
T1 - Characteristics of pseudo-second-order kinetic model for liquid-phase adsorption
T2 - A mini-review
AU - Wu, Feng Chin
AU - Tseng, Ru Ling
AU - Huang, Shang Chieh
AU - Juang, Ruey Shin
PY - 2009/8/15
Y1 - 2009/8/15
N2 - Since the introduction of pseudo-second-order (PSO) model for the description of adsorption kinetics in 1999, it has been widely applied in liquid-phase adsorption systems. An approaching equilibrium factor (Rw) was defined and deduced from the PSO model in this work. The adsorption characteristic curves were built up, in which three different zones of the PSO model were classified. Activated carbons with various particle sizes were prepared from fir wood with KOH activation for the adsorption of phenol, 4-chlorophenol (4-CP), 2,4-dichlorophenol (2,4-DCP), 2,4,6-trichlorophenol (2,4,6-TCP), and methylene blue (MB) from water. Suitable ranges of the PSO model and the effect of adsorbent particle size on the Rw value were analyzed. It was found that the quantity k2qe was exactly the inverse of the half-life of adsorption process. It could be used as an indicator of kinetic performance because it was a key parameter affecting the fractional adsorption at any time. That is, k2qe, a newly defined rate index, could provide the related information between the static and dynamic behavior of adsorption processes in engineering practice.
AB - Since the introduction of pseudo-second-order (PSO) model for the description of adsorption kinetics in 1999, it has been widely applied in liquid-phase adsorption systems. An approaching equilibrium factor (Rw) was defined and deduced from the PSO model in this work. The adsorption characteristic curves were built up, in which three different zones of the PSO model were classified. Activated carbons with various particle sizes were prepared from fir wood with KOH activation for the adsorption of phenol, 4-chlorophenol (4-CP), 2,4-dichlorophenol (2,4-DCP), 2,4,6-trichlorophenol (2,4,6-TCP), and methylene blue (MB) from water. Suitable ranges of the PSO model and the effect of adsorbent particle size on the Rw value were analyzed. It was found that the quantity k2qe was exactly the inverse of the half-life of adsorption process. It could be used as an indicator of kinetic performance because it was a key parameter affecting the fractional adsorption at any time. That is, k2qe, a newly defined rate index, could provide the related information between the static and dynamic behavior of adsorption processes in engineering practice.
KW - Activated carbon
KW - Adsorption
KW - Approaching equilibrium factors
KW - Kinetic model
KW - Rate index
UR - http://www.scopus.com/inward/record.url?scp=67349135313&partnerID=8YFLogxK
U2 - 10.1016/j.cej.2009.02.024
DO - 10.1016/j.cej.2009.02.024
M3 - 短篇评述
AN - SCOPUS:67349135313
SN - 1385-8947
VL - 151
SP - 1
EP - 9
JO - Chemical Engineering Journal
JF - Chemical Engineering Journal
IS - 1-3
ER -