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Deniz F.,Nigar Erturk Trade Vocational High School
Desalination and Water Treatment | Year: 2013

The ability of pine cone (PC) for dye removal from aqueous media was studied and Lanasol Yellow 2R (LY2R) was used as a model metal-containing dye. The effects of various parameters like pH, adsorbent dosage and size, dye concentration, temperature, contact time and ionic strength on the dye adsorption were investigated. The equilibrium data were well represented by the Langmuir isotherm model. The maximum adsorption capacity of the PC for LY2R was found as 41.15 mg g-1. The adsorption kinetics followed the pseudo-second-order model. The thermodynamic tests revealed that the adsorption was spontaneous and endothermic process. Accordingly, the PC could be employed as a promising alternative adsorbent for eliminating the dye from aqueous solutions. © 2013 Copyright Balaban Desalination Publications. Source


Deniz F.,Nigar Erturk Trade Vocational High School
Desalination and Water Treatment | Year: 2013

This study presents a systematic procedure to define optimal operational conditions for optimizing methyl orange biosorption by almond shell waste using the Taguchi method. Several biosorption experiments were conducted using the L9 orthogonal array with four factors in three levels. The optimum set of parameters was obtained as reaction time of 80 min, initial dye concentration of 100 mg L-1, pH of 3, and temperature of 20°C, considering the larger is better pattern. Analysis of variance displayed that the initial dye concentration was the dominant factor affecting the dye biosorption. Verification experiments were performed to confirm the optimized results. Further, a regression model was developed as a function of the process parameters mentioned. Finally, a single-stage batch biosorption process design was presented based on the Langmuir isotherm. Thus, the Taguchi statistical approach provided a pleasing success in specifying the optimum conditions for the dye removal process. © 2013 Balaban Desalination Publications. Source


Deniz F.,Nigar Erturk Trade Vocational High School
The Scientific World Journal | Year: 2013

The capability of Prunus amygdalus L. (almond) shell for dye removal from aqueous solutions was investigated and methyl orange was used as a model compound. The effects of operational parameters including pH, ionic strength, adsorbent concentration and mesh size, dye concentration, contact time, and temperature on the removal of dye were evaluated. The adsorption kinetics conformed to the pseudo-second-order kinetic model. The equilibrium data pointed out excellent fit to the Langmuir isotherm model with maximum monolayer adsorption capacity of 41.34 mg g-1 at 293 K. Thermodynamic analysis proved a spontaneous, favorable, and exothermic process. It can be concluded that almond shell might be a potential low-cost adsorbent for methyl orange removal from aqueous media. © 2013 Fatih Deniz. Source


The capability of walnut shell for dye removal from aqueous media was investigated and Maxilon Red GRL (MR GRL) was used as a model dye. The pseudo-second-order kinetic model showed the best correlation with the experimental data. The relationships between this kinetic model parameters and biosorption performance were evaluated. The approaching equilibrium factor (Rw) displayed that the biosorption nearly reached equilibrium and approach to equilibrium increased with higher biosorbent dosage. The equilibrium data presented an excellent fit to the Langmuir isotherm model. Thermodynamic analysis proved a spontaneous, favorable, and endothermic process. It can be concluded that walnut shell could be a potential low-cost biosorbent for the MR GRL removal from aqueous solutions. © 2013 © 2013 Balaban Desalination Publications. All rights reserved. Source


Deniz F.,Nigar Erturk Trade Vocational High School
Environmental Progress and Sustainable Energy | Year: 2014

The feasibility of walnut shell as a waste biomaterial for removing Maxilon Red GRL (MR GRL) dye from aqueous solutions was investigated in this work. The biosorption was studied as a function of pH, ionic strength, biosorbent dosage, particle size, temperature, initial dye concentration, and contact time. Nonlinear kinetic equations including the pseudo-first order, pseudo-second order, and Logistic were applied to the experimental data for describing the biosorption kinetics. The Logistic model showed the best correlation with the experimental data. Besides, intraparticle diffusion was not the sole rate-controlling factor. The Langmuir, Freundlich, Hill, and Dubinin-Radushkevich nonlinear isotherms were fitted to the equilibrium data, and the Hill model presented the best fit. Thus, this research highlights the potential of walnut shell as an effective biosorbent for the removal of MR GRL from aqueous media. © 2013 American Institute of Chemical Engineers Environ Prog, 33: 396-401, 2014 © 2013 American Institute of Chemical Engineers Environ Prog. Source

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