Open AccessBranched-Pore Kinetic Model for Basic Dyestuff Adsorption onto Natural Clay
Author(s) -
Mohammad S. El-Geundi
Publication year - 1992
Publication title -
adsorption science and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.682
H-Index - 36
eISSN - 2048-4038
pISSN - 0263-6174
DOI - 10.1177/026361749200900305
Subject(s) - chemistry , microporous material , mass transfer , adsorption , diffusion , kinetic energy , analytical chemistry (journal) , aqueous solution , macropore , thermodynamics , chromatography , organic chemistry , mesoporous material , physics , quantum mechanics , catalysis
The adsorption of Basic Blue 69 from aqueous solution onto natural clay has been studied using an agitated batch adsorber. The branched-pore kinetic model (BPKM). based on external mass transfer, macropore diffusion and micropore diffusion, has been used to predict the performance of a batch adsorber. A computer program has been developed to generate theoretical concentration-time curves and these results adjusted to experimental concentration-time curves by a ‘best fit’ approach. A sensitivity analysis has been performed to study the effect of the main mass-transfer parameters, K s , D s , K b and f, on the shape of the concentration decay curves. The variables of initial dye concentration and natural clay mass have been successfully correlated using constant values of the mass-transfer parameters K s , D s , K b and f. The K s value is (3.7 ± 0.1) × 10 −3 cm/s, the D s value is (2.6 ± 0.1) × 10 −8 cm 2 /s. the K b value is (1.7 ± 0.1) × 10 −7 cm/s and finally the f value is 0.56 ± 0.01. The micropore diffusion terms enable the concentration decay curves to be predicted accurately for a longer period of time than in previous models.