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M.A. Martın-Lara,G. Blazquez,A. Ronda,I.L. Rodrıguez,M. Calero 한국공업화학회 2012 Journal of Industrial and Engineering Chemistry Vol.18 No.3
Biosorption of Pb2+ from aqueous solutions and desorption of Pb2+ from acid-treated olive stone were studied. Equilibrium screening tests of lead desorption established a solution of 0.3 M hydrochloric acid as the most appropriate eluting agent. Fixed-bed biosorption and desorption recovery curves for Pb2+were obtained for multiple consecutive biosorption–desorption cycles and the biosorption properties of the biomass for Pb2+ were compared after each cycle to evaluate the stability of the biomass. The biosorbent retained most of its original uptake capacity over fourteen cycles of use. Life factor calculation revealed that biosorbent bed would be completely exhausted after 71.3 cycles.
Study of kinetics in the biosorption of lead onto native and chemically treated olive stone
G. Blazquez,M. Calero,A. Ronda,G. Tenorio,M.A. Martın-Lara 한국공업화학회 2014 Journal of Industrial and Engineering Chemistry Vol.20 No.5
In this research, olive stone was used as precursor for the development of new biosorbents for lead ions. Chemical treatments were analyzed in terms of their effects on physical–chemical properties and kinetics of lead removal. A kinetic study of the biosorption of lead ions by olive stone was analyzed according to six different kinetic models (pseudo first, pseudo second, pseudo n-order, Elovich, solid diffusion and double exponential models). 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 42.62 10 6 to 508.3 10 6 m min 1 and the internal mass transfer coefficient (ki) from 3.76 10 6 to 73.4 10 6 m min 1. On the other hand, the analysis of experimental data showed that chemical treatments of the biomass led to increase biosorption capacity of the native biomass.
Sensitivity and optimisation procedures for truss structures under large displacement
Bothma, A.S.,Ronda, J.,Kleiber, M. Techno-Press 1999 Structural Engineering and Mechanics, An Int'l Jou Vol.7 No.1
The work presented here focuses on the development of suitable discretised formulations, for large-displacement shape and non-shape design sensitivity analysis (DSA), which enable the straightforward incorporation of structural optimisation into established finite element analysis (FEA) codes. For the generalised displacement-based functional the design sensitivity vector has been expressed in terms of displacement sensitivity. The Total Lagrangian formulation is utilised for modelling of large deformation of truss structures. The variational formulation of the sensitivity analysis procedure is discretised by using "pseudo" - finite elements, Results are presented for the sensitivity analysis and optimisation of standard truss structures. For the purposes of this work, the analysis and optimisation procedures outlined below are incorporated into the FEA code ABAQUS.