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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.
Evaluation and comparison of the biosorption process of copper ions onto olive stone and pine bark
G. Blazquez,M.A. Martin-Lara,E. Dionisio-Ruiz,G. Tenorio,M. Calero 한국공업화학회 2011 Journal of Industrial and Engineering Chemistry Vol.17 No.6
Olive stone (OS) and pine bark (PB) were used as effective biosorbents for the removal of Cu(II) from aqueous solutions. The biosorbents were 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 pH, particle size, biosorbent dosage, contact time and initial copper concentration. Equilibrium data agreed well with Langmuir isotherm. The kinetics data fitted well into the pseudosecond-order model with correlation coefficient greater than 0.99. Finally, dynamic biosorption studies were carried out using a packed bed column and the main column parameters were determined.
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.
Luis A. Trujillo-Cayado,M. Carmen Alfaro,Jenifer Santos,Nuria Calero,José Muñoz 한국공업화학회 2018 Journal of Industrial and Engineering Chemistry Vol.66 No.-
This contribution deals with the development of emulsions formulated using thyme essential oil and a new biomass-derived surfactant. In addition, this work extends our knowledge concerning the factors that can influence stability and droplet size distributions of microfluidized emulsions, such as the geometry of the rotor–stator used and the homogenization rate in the primary homogenization. Stable thyme oil-in-water emulsions (30 wt%) containing submicron droplets were formed. Interestingly, laser diffraction results reveal that mean droplet sizes are mainly controlled by homogenization rates and polydispersity by the rotor–stator geometry used in the first step of homogenization. In addition, higher droplet sizes for pre-emulsions seem to be a key factor in order to reduce both the degree of recoalescence and the size of the droplets in the second homogenization step. Furthermore, higher droplet sizes in the pre-emulsion favour higher physical stability of the final emulsions. Finally, this research highlights the importance of controlling primary homogenization conditions for the physical stability of microfluidized emulsions that contain natural ingredients.
Development of eco-friendly emulsions produced by microfluidization technique
J. Santos,L.A. Trujillo-Cayado,M.C. Alfaro,J. Mun˜oz,N. Calero 한국공업화학회 2016 Journal of Industrial and Engineering Chemistry Vol.36 No.-
Green solvents have recently attracted much attention due to the necessity of replacing traditionalsolvents. In this work, a mixture of eco-friendly solvents and a green surfactant have been utilized inemulsions with a potential use for agrochemicals. Results obtained show that the Microfluidizer1 wascapable of producing very fine nanoemulsions (D3,2 = 280 nm).This contribution has demonstrated thesignificant role of the rheology to understand the destabilization processes which occur in emulsionswith very similar DSD. Thus, we found the optimum homogenization pressure was 1034 bar (15,000 psi)on account of the lack of creaming and of low coalescence.