Title: Turkish Journal of Engineering and Environmental Sciences

Title: Turkish Journal of Engineering and Environmental Sciences

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? Kaya, S. and Oner, M.D. (1995), Sorption characteristics of fresh Gaziantep cheese. Turkish Journal of Engineering and Environmental Sciences, 19 (3), 263-267.

Full Text: Tur J Eng Env Sci19, 263.pdf

Abstract: Water activity of Gaziantep cheese prepared in the laboratory was determined as 0.95 by using the Proximity Equilibration Cell (PEC) method. Moisture sorption isotherms were obtained at 12, 20 and 30°C. Guggenheim-Anderson-deBoer and Halsey equations were used to evaluate the sorption data, and parameter estimation was carried out. Both equations fit to the data and gave reasonably good results, indicating that they can be used to represent Moisture Sorption Isotherms of Gaziantep cheese. The effect of temperature on sorption isotherms was investigated, and the heat of sorption was calculated as 2.02 kcal/mol at 1 g/100 g moisture content using the Clausius-Clapeyron equation.

Keywords: Isotherms, Parameter Estimation, Proximity, Sorption, Sorption Characteristics, Temperature, Water

? Sağ, Y., Açikel, Ü., Aksu, Z. and Kutsal, T. (1998), Competitive biosorption of chromium(VI), iron(III) and copper(II) ions from binary metal mixtures by R. arrhizus and C. vulgaris. Turkish Journal of Engineering and Environmental Sciences, 22 (2), 145-154.

Full Text: 1998\Tur J Eng Env Sci22, 145.pdf

Abstract: In this study, the simultaneous adsorption process of Cr(VI), Fe(III) by R. arrhizus and C. vulgaris and Cu(II) in pairs of metal mixtures were investigated and compared to single component systems. The capabilities of the fungal and the algal biomass to bind two metals simultaneously in solution are shown as a function of pH, metal combinations and levels of metal concentration. The effects of the co-presence of Cr(VI)-Fe(III) and Cr(VI)-Cu(II) ions together in aquatic solutions on the biosorption of Cr(VI). Fe(III) and Cu(II) ions were investigated in terms of initial rates of biosorption and equilibrium metal removal. Optimum pH for the biosorption of Cr(VI) and Fe(III) was determined as 2.0 whereas higher biosorptive uptake of Cu(II) was obtained at pH 4.0. Since the initial biosorption rates and equilibrium metal removal decreased with increasing concentration of the accompanying metal ion, the interactive effects of Cr(VI)-Fe(III) and Cr(VI)-Cu(II) on both microorganisms were found to be antagonistic.

Keywords: Adsorption, Biomass, Biosorption, Competitive, Copper(II), Cr(VI), Cu(II), Equilibrium, Metal, Metals, pH, Removal, Solutions

? Özer, A. and Özer, D. (1998), The removal of nickel(II) ions by Cladophora crispata in a two-staged batch reactor. Turkish Journal of Engineering and Environmental Sciences, 22 (4), 305-313.

Full Text: 1998\Tur J Eng Env Sci22, 305.pdf

Abstract: The effects of adsorption conditions on the adsorption of nickel(II) ions to inactivated Cladophora crispata, a green algae, were investigated in an agitated batch reactor. The optimum initial pH, temperature, initial metal ion concentration and microorganism concentration were found to be 5.0, 25°C, 200 mg/L and 1.00 g/L, respectively. The Freundlich and Langmuir adsorption isotherms were developed at different initial pH and temperature values. It was observed that the experimental data fitted both the Freundlich and Langmuir isotherm models. Under optimum adsorption conditions, the adsorption of nickel(II) ions to C. crispota was investigated in a two-stage batch reactor. For different ratios of algae concentration (X0) to volume water containing nickel(II) (V0), the residual nickel(II) ion concentrations at the equilibrium were calculated from models developed using the isotherm constants. Then, the experimental values were compared with the theoretical values.

Keywords: Adsorption, Adsorption Isotherms, Equilibrium, Freundlich, Freundlich and Langmuir Adsorption Isotherms, Isotherm, Isotherms, Langmuir, Langmuir Isotherm, Metal, Microorganism, Models, pH, Removal, Temperature, Water

? Akçin, G. (2001), Biosorption of heavy metals by biomass. Turkish Journal of Engineering and Environmental Sciences, 25 (3), 143-152.

Full Text: 2001\Tur J Eng Env Sci25, 143.pdf

Abstract: Wetland plants are successfully used in the biosorption of heavy metals in natural and constructed wetlands. In this study, the removal of heavy metals by water hyacinth (Eichhornia crassipes (Mart.)Solms)) were investigated. The plants were grown under control in the Turkish climate. The biosorption was dependent on factors such as metal concentration, constant temperature, pH and relative moisture. The plants were exposed to different metal concentrations of Chromium(III), Chromium(VI) and Copper(II) in the flow rate system. Water hyacinths are able to remove Chromium(III), Chromium(VI) and Copper(II) rapidly from the aqueous system by root biosorption, but Chromium(VI) in a low concentration had higher biosorption in leaves than in roots. Water hyacinth may be a good indicator because of these properties. Also in this study, regular and irregular periods of heavy metal biosorption were investigated.

Keywords: Aqueous, Biosorption, Biosorption of Heavy Metals, Chromium(VI), Copper(II), Heavy Metal, Heavy Metals, Metal, Metals, pH, Removal, System, Temperature, Water, Wetlands

? Oladoja, N., Aboluwoye, C. and Oladimeji, Y. (2008), Kinetics and isotherm studies on methylene blue adsorption onto ground palm kernel coat. Turkish Journal of Engineering and Environmental Sciences, 32 (5), 303-312.

Full Text: 2008\Tur J Eng Env Sci32, 303.pdf

Abstract: Palm kernel coat (PKC) was collected from an oil palm seed processing factory and the residual oil on the PKC was removed by saponification. The ability of the PKC to remove Methylene Blue (MB), a basic dye from waste stream, was studied by the method of continuous variation of 2 process variables: Initial MB concentration (mg/l) and PKC dosage (g/l). The amount of MB sorbed per gram of PKC (q(t) mg/g) increased with increasing initial MB concentration while a reverse trend was observed when the PKC dosage was increased. The experimental data were fitted into the following kinetic models: Lagergren pseudo-first order, the chemisorptions pseudo-second order, Elovich kinetic model, and the intraparticle diffusion model. It was observed that chemisorptions pseudo-second order kinetic model described the Sorption process with high coefficients of determination (r(2)) better than any other kinetic models. The equilibrium isotherms, for the sorption of MB oil PKC, were analyzed using 3 widely used isotherm models (Langmuir, Freundlich, and Temkin isotherm models). Error analysis, using the linear correlation coefficient’s (r(2)), showed that the Langmuir isotherm best fits the MB adsorption data on PKC. The monolayer coverage capacity of the PKC, obtained from the Langmuir isotherm studies, was 277.77 mg/g. Thermodynamics showed that the adsorption of MB on PKC was most favorable and spontaneous.

Keywords: Adsorption, Basic Dye, Capacity, Coverage, Diffusion, Dye, Elovich, Elovich Kinetic Model, Equilibrium, Freundlich, Intraparticle Diffusion, Isotherm, Isotherms, Kinetic, Kinetic Models, Kinetics, Langmuir, Langmuir Isotherm, Models, Monolayer Coverage, Pseudo Second Order, Pseudo-First Order, Pseudo-Second Order, Pseudo-Second-Order, Sorption, Temkin Isotherm, Thermodynamics

? Oladoja, N.A., Asia, I.O., Aboluwoye, C.O., Oladimeji, Y.B. and Ashogbon, A.O. (2008), Studies on the sorption of basic dye by rubber (Hevea brasiliensis) seed shell. Turkish Journal of Engineering and Environmental Sciences, 32 (3), 143-152.

Full Text: 2008\Tur J Eng Env Sci32, 143.pdf

Abstract: The present study investigated the ability of rubber seed shell (RSS) to abstract methylene blue (MB) from aqueous solution. The process of sorption of methylene blue from solution was analysed using 5 different isotherm models (Langmuir, Freundlich, Temkin, Harkins-Jura, and Halsey isotherm equations). The highest, values of r(2) were obtained when the experimental data were fitted into Freundlich and Halsey isotherm equations (0.999). The RSS/MB system was found to be affected by the sorbent dose and initial (lye solution. The kinetic data showed that the sorption capacity of RSS for the dye increased with increasing initial dye concentration, while a reverse trend was observed when the effect of sorbent dosage was, studied. Analysis of the data obtained from the different sorption studies revealed that the data fitted better to the pseudo-second order model than any other kinetic model, indicating that the sorption process will include chemisorptions of methylene blue dye on rubber seed shell.

Keywords: Abstract, Aqueous, Basic Dye, Capacity, Dye, Freundlich, Isotherm, Kinetic, Langmuir, Methylene Blue, Models, Pseudo Second Order, Pseudo-Second Order, Pseudo-Second-Order, Sorption, System