TY  - JOUR
A1  - Ofomaja, Augustine Enakpodia
A1  - Unuabonah, Emmanuel Iyayi
T1  - Kinetics and time-dependent Langmuir modeling of 4-nitrophenol adsorption onto Mansonia sawdust
JF  - Journal of the Taiwan Institute of Chemical Engineers
N2  - Often time's adsorption of large molecules onto untreated lignocellulosic materials is viewed as a two stage process and has frequently been characterized only by kinetic models while the rate limiting step of adsorption is determined only at various stages of the adsorption process. In this study the kinetics and the contribution of diffusion processes to 4-nitrophenol adsorption onto untreated sawdust was examined and the overall rate limiting step evaluated.
 The adsorption profile showed an initial rapid uptake of 4-nitrophenol which decreased and became almost constant after 5 min of contact. Analysis of the adsorption profile with the intraparticle diffusion equation and fractional 4-nitrophenol uptake with time showed that the profile can be divided into three different stages. The rate determining step of 4-nitrophenol adsorption was then evaluated based on the activation energies of each processes along with their activation parameters (Delta G*, Delta H* and Delta S*). The results revealed that external mass transfer was the overall rate limiting step with activation parameters E-a = 21.11, Delta H* = 23.75 and Delta S* = 144.97. Time dependent Langmuir modeling was carried out to optimize process parameters. (c) 2013 Taiwan Institute of Chemical Engineers. Published by Elsevier B.V. All rights reserved.
KW  - Untreated agricultural wastes
KW  - Activation parameters
KW  - Diffusion processes
KW  - Double exponential model
KW  - 4-Nitrophenol
KW  - Adsorption
Y1  - 2013
U6  - https://doi.org/10.1016/j.jtice.2012.12.021
SN  - 1876-1070
VL  - 44
IS  - 4
SP  - 566
EP  - 576
PB  - Elsevier
CY  - Amsterdam
ER  -