International Journal of Coal Geology , 87 2 , Methane and carbon dioxide sorption on a set of coals from India. International Journal of Coal Geology , 85 , Peach , Christopher J. A new experimental method to determine the CO2 sorption capacity of coal. Energy Procedia , 4 , Physisorption in Porous Materials.
Gauden , Artur P. The Journal of Physical Chemistry C , 11 , High-pressure sorption isotherms and sorption kinetics of CH4 and CO2 on coals. Fuel , 89 3 , Mazzotti , Ronny Pini , G. Storti , L. Helium-volume dynamics of Upper Freeport coal powder and lumps. International Journal of Coal Geology , 77 , Causes and consequences of errors in determining sorption capacity of coals for carbon dioxide at high pressure.
Enhanced coalbed methane recovery. The Journal of Supercritical Fluids , 47 3 , Astashov , A. Belyi , A. Quasi-equilibrium swelling and structural parameters of coals.
Fuel , 87 , Dutta , S. Harpalani , B. Modeling of CO2 sorption on coal. Langmuir , 24 15 , International Journal of Coal Geology , 74 , Swelling of Australian coals in supercritical CO2. International Journal of Coal Geology , 74 1 , Temperature dependence of sorption of gases by coals and charcoals. International Journal of Coal Geology , 73 , International Journal of Coal Geology , 73 2 , Swelling-induced volumetric strains internal to a stressed coal associated with CO2 sorption.
International Journal of Coal Geology , 72 , Goodman , A. Busch , R. Bustin , L. Chikatamarla , S. Day , G. Duffy , J. Fitzgerald , K. Gasem , Y. Gensterblum , C. Hartman , C. Jing , B. Krooss , S. Mohammed , T. Pratt , R. Robinson , V. Romanov , R. Sakurovs , K. Schroeder , C. Saghafi , M. Faiz , D. CO2 storage and gas diffusivity properties of coals from Sydney Basin, Australia.
International Journal of Coal Geology , 70 , Measurement and interpretation of supercritical CO2 sorption on various coals. International Journal of Coal Geology , 69 4 , Tenney , C. Molecular simulation of carbon dioxide adsorption in chemically and structurally heterogeneous porous carbons. Environmental Progress , 25 4 , Romanov , Y. Introduction to food biochemistry and technology. Fennema O. Food Chemistry. Water sorption isotherms of starch powders.
Part 2: Thermodynamic characteristics. J Food Eng. Arslan N, Togrul H. Modelling of water sorption isotherms of macaroni stored in a chamber under controlled humidity and thermodynamic approach.
Moisture sorption characteristics of chickpea f lour. Sorption isotherm of Chenopodium ambrosioides leaves at three temperatures. Effect of temperature and initial moisture content on sorption isotherms of banana dried by tunnel drier. Int J Food Sci Tech. Sorption isotherm and state diagram of grapefruit as a tool to improve product processing and stability.
Mujumdar AS Ed. Advances in Drying, Vol. Fortes M, Okos MR. Drying theories: Their bases and limitations as applied to foods and grains; p. Water sorption by proteins: Milk and whey proteins. Crit Rev Food Sci Nutr. Mohsenin NN. Physical properties of plant and animal materials. Water Activity: Inf luences on Food Quality. Van den Berg C, Bruin S. Water activity and its estimation in food systems: theoretical aspects; p.
Moisture sorption isotherms of two varieties of millet. Food Bioprod Process. On a theory of Van der Waals adsorption of gases. J Am Chem Soc. Blahovec J, Yanniotis S. Modified classification of sorption isotherms. Models for sorption isotherms for foods: A review. Dry Technol. Water vapor sorption isotherms and the caking of food powders. Food Chem. Chirife J, Iglesias H. Equations for fitting water sorption isotherms of foods: Part 1 - a review. The measurement of the sorption isotherm of water in paint films.
Chem Eng Process. Adsorption of gases in multimolecular layers. Sorption isotherms and moisture sorption hysteresis of intermediate moisture content banana. McKenna BM Ed. Engineering and Foods, Vol. New York, United States: Elsevier applied science publishers; Van den Berg C. Description of water activity of foods for engineering purposes by means of the G.
Sorption isotherms data and mathematical models for pear bartlett Pyrus sp. Evaluation of drying parameters and desorption isotherms of garden mint leaves Mentha crispa L. Timmermann EO. Zung JP. Levine H, Slade L Eds. Water Relations in Foods. Food-water relations: Progress and integration, comments and thoughts; p. The fitting of various models to water sorption isotherms of tea stored in a chamber under controlled temperature and humidity.
Models of desorption isotherms of yam Dioscorea rotundata. Sorption isotherms of potato slices dried and texturized by controlled sudden decompression. Water sorption isotherms and glass transition temperature of spray dried tomato pulp.
Kaymak-Ertekin F, Gedik A. Sorption isotherms and isosteric heat of sorption for grapes, apricots, apples and potatoes. Lebensm Wiss Technol. Mathematical modelling of moisture sorption isotherms and determination of isosteric heat of blueberry variety O'Neil.
Oswin CR. The kinetics of package life. J Soc Chem Ind Dec; 65 12 : Mathematical models for optimization of flexible film packaging of foods for storage. T ASAE ; Adsorption isotherms of the dry cashew Apple. Mathematical models for adjustment of desorption isotherms of banana variety silver. Desorption and isosteric heat of mango pulp. Moisture sorption isotherms and thermodynamic properties of apple Fuji and garlic.
Moisture sorption isotherm characteristics of food products: A review. Rahman MS Ed. Food Properties Handbook. Boca Raton, Fl. Water Activity Measurement Methods of Foods; p. Togrul H, Arslan N. In fact, the activation treatment with CO 2 gives rise to the development of porosity through the opening of new micropores together with the deepening and enlargement of the existing ones see Table 1. The mechanism of uptake of MB on activated carbons can be grouped into nonelectrostatic and electrostatic interactions.
According to the TPD results the activated carbons have basic character. Additionally, the pH pzc value of all samples exceeds 7. Indeed the activated carbons are positively charged and MB is a basic dye, dissolved in water it is positively charged. The results obtained by the application of the two-parameter model, Langmuir and Freundlich equations are presented in Table 3.
From this table, the correlation coefficients for Freundlich isotherm are significantly high than that of Langmuir isotherm for samples C16, C28 and C A good fit of this equation reflects heterogeneous surface.
However, adsorption of MB on activated carbon C37 agrees with Langmuir model. The analysis by considering the two parameters Q L and K F which are measures of adsorption capacity, it can be seen that there is a significant increase in the Langmuir monolayer capacity with increasing degree of activation, which is consistent with the increase of the pore volume and surface area of those samples as can be seen in Table 1.
To further explore the effect of the porous structure in the adsorption of MB, Fig. There is in, both cases, an increase in the amount adsorbed with the pore volume. The adsorption capacity for MB is an increasing function of the extent of activation, this shows that the microporosity, the surface area and mesoporosity, are the factors defining the adsorption capacity for MB in this study.
Similar results have been reported for adsorption of MB on activated carbons Altenor et al. According to the values of R L , all the systems show favorable adsorption of MB, i. The low values of R L indicate high and favorable adsorption of MB onto activated carbons.
Amount adsorbed of methylene blue as a function of a micropore volume V o, obtained from the N 2 adsorption at 77 K and b volume of mesopores V mes. In relation to the Freundlich equation, it can be seen from Eq. On the other hand, it is noteworthy that each K F is significantly lower than the corresponding value of Q L. It should therefore be evident that K F is not a measure of the total adsorption capacity but that it should be considered, a comparative measure of the adsorption under specified conditions.
This is in great agreement with the findings regarding to R L values Belala et al. The three-parameter model, R—P and Sips equations have also been applied to evaluate the fit by isotherm for the adsorption of Mb by Fig. The calculated isotherm parameters and their corresponding coefficient of determination, R 2 , values are shown in Table 4.
The higher R 2 values for the three-parameter isotherms suggest the applicability of these models to represent the equilibrium sorption of MB by activated carbon of date pits.
There is good agreement between corresponding values of Q s and Q L for C37 and C64 samples, while the corresponding values of Q L for C16 and C28 are lower, probably because these samples do not obey Langmuir isotherm. It is believed that adsorption capacity obtained from the Sips equation could be more realistic than that from the Langmuir equation.
Thus, for each parameter, the values show an increase with increasing pore volume and surface area of activated carbons. However, the parameter n F appears to be more useful for characterizing the adsorption affinity. The isotherm data can well be fitted with four adsorption isotherm models by nonlinear regression.
The applicability of Freundlich, Langmuir, Redlich—Peterson and Sips equations can produce consistent results, even though the parameter values are not exactly the same.
The three-parameter equations Redlich—Peterson and Sips provide better fitting than the two-parameter equations Freundlich and Langmuir , which is due to the fact that these equations contains three parameters. According to the results obtained, activated carbon issued from date stones could be employed as effective adsorbents and could be considered as an alternative to adsorbents for the removal of color. Bioresour Technol — Article Google Scholar.
J Hazard Mater — Desalination — J Anal Appl Pyrolysis — Langmuir — Alden Press, Oxford, pp 9— Google Scholar. Carbon — Freundlich HMF Over the adsorption in solution. Z Phys Chem 57A— J Hazard Mater Haghseresth F, Lu GQ Adsorption characteristics of phenolic compounds onto coal-reject-derived adsorbents.
Energy Fuels — J Chem Eng Data — Langmuir I The constitution and fundamental properties of solids and liquids. J Am Chem Soc — Dyes and Pigments — Colloid and Interf Sc — J Phys Chem
0コメント