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RISS 인기검색어
- 검색키워드
- 저자 : M.A. Martın-Lara (검색결과 3 건)
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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.
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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.
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Copper biosorption by pine cone shell and thermal decomposition study of the exhausted biosorbent
G. Blazquez,M.A. Martın-Lara,E. Dionisio-Ruiz,G. Tenorio,M. Calero 한국공업화학회 2012 Journal of Industrial and Engineering Chemistry Vol.18 No.5
Pine cone shell (PCS), a vegetable solid waste has been used as effective and efficient biosorbent for the removal of Cu(II) from aqueous solutions. The biosorbent was characterized by elemental analysis,potentiometric titrations, surface area and pore size distribution and FTIR analyses. Batch adsorption experiments were carried out as a function of solution pH, particle size, biosorbent dosage, contact time,and initial metal ion concentration. Then, equilibrium isotherms and kinetic data parameters were evaluated. Equilibrium data agreed well with Langmuir isotherm model. The biosorption capacities of PCS for Cu(II) were determined at 25 8C with the Langmuir model as 6.81 mg/g. The kinetics data fitted well into the pseudo-second-order model with correlation coefficient greater than 0.99. Also, dynamic biosorption studies were carried out using a packed-bed column and the main column parameters were determined. Pine cone shell was shown to be a promising biosorbent for Cu(II) removal from aqueous solutions. Finally, the pyrolysis characteristics of native PCS and Cu-loaded PCS were investigated by thermogravimetric analysis (TGA) in order to study the possible recycling of PCS after its use as biosorbent of copper.
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