Analysis of the kinetics of lead biosorption using native and chemically treated olive tree pruning

•Olive tree pruning was used as precursor for the development of new biosorbents for lead ions removal.•A description of kinetics of lead biosorption onto these new biosorbents was presented.•Kinetic data were successfully described with pseudo-nth order and double exponential models.•Lead biosorpti...

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Bibliographic Details
Published in:Ecological engineering 2013-09, Vol.58, p.278-285
Main Authors: Ronda, A., Martín-Lara, M.A., Calero, M., Blázquez, G.
Format: Article
Language:English
Subjects:
Animal, plant and microbial ecology
Applied ecology
Biological and medical sciences
Biomass
biosorbents
Biosorption
Diffusion
Double exponential model
Environment and sustainable development
Fundamental and applied biological sciences. Psychology
General aspects. Techniques
ions
Kinetics
Lead
Mass transfer
Mathematical models
Methods and techniques (sampling, tagging, trapping, modelling...)
Olea
Olive tree pruning
Olives
Pruning
Raw materials
Trees
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Summary:•Olive tree pruning was used as precursor for the development of new biosorbents for lead ions removal.•A description of kinetics of lead biosorption onto these new biosorbents was presented.•Kinetic data were successfully described with pseudo-nth order and double exponential models.•Lead biosorption properties of olive tree pruning were improved with treatments. In this research, new biosorbents of olive tree biomass were obtained by acid and basic treatment of the raw material at 50°C and 1M of chemical agent concentration. A kinetic study of the biosorption of lead ions by olive tree pruning was analyzed according to six different kinetic models. The pseudo first, pseudo second, pseudo n-order, Elovich, solid diffusion and double exponential models were employed to study the kinetics. The biosorption kinetic data were successfully described with pseudo-nth order and double exponential models for all biosorbents. The double exponential model allowed estimating the values of external and internal mass transfer coefficients. The values of external mass transfer coefficient (ke) ranged from 16.2×10−6 to 1066×10−6mmin−1 and the internal mass transfer coefficient (ki) from 9×10−6 to 69.88×10−6mmin−1. On the other hand, the analysis of experimental data showed that chemical treatments of the biomass led to increase biosorption capacity of the raw biomass.
ISSN:0925-8574
1872-6992
DOI:10.1016/j.ecoleng.2013.07.013