Browsing by Author "Boncukcuoglu, Recep"

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Adsorption of Methyl Violet Dye a Textile Industry Effluent Onto Montmorillonite-Batch Study
(Taylor & Francis inc, 2014) Aladag, Erdinc; Fil, Baybars Ali; Boncukcuoglu, Recep; Sozudogru, Onur; Yilmaz, Alper Erdem
In this study, methyl violet (MV) dye adsorption from synthetically prepared solutions onto montmorillonite was investigated. Experimental parameters were selected as stirring speed, adsorbent dosage, initial dyestuff concentration, initial solution pH, ionic strength, and temperature. It was determined that adsorption rate increased with increased stirring speed, initial dye concentration, solution pH, ionic strength, and temperature, but decreased with increased adsorbent dosage. The experimental data were analyzed by Langmuir, Freundlich, Temkin, and Dubinin-Radushkevich isotherms, and it was found that the isotherm data were reasonably correlated by Langmuir isotherm. Maximum adsorption capacity of montmorillonite for MV dye was calculated as 230.04 mg g(-1). Pseudo-first-order, pseudo-second-order, Elovich, and intraparticle particle diffusion models were used to fit the experimental data. Pseudo-second-order rate equation provided realistic description of adsorption kinetics. Thermodynamic parameters were calculated as 62.14 kJ mol(-1), 59.55 kJ mol(-1), 51.98 kJ mol(-1), and 0.0242 kJ mol(-1) K-1 for Ea, Delta H*, Delta G*, and Delta S* at 293 K, respectively. The value of the calculated parameters indicated that the physical adsorption of MV on the clay was dominant and the adsorption process was also endothermic. The positive values of Delta S degrees suggest the increased randomness. The positive Delta G degrees value indicated the un-spontaneous nature of the adsorption model.
Adsorptive Removal of Cationic (By2) Dye From Aqueous Solutions Onto Turkish Clay: Isotherm, Kinetic, and Thermodynamic Analysis
(Taylor & Francis inc, 2016) Sozudogru, Onur; Fil, Baybars Ali; Boncukcuoglu, Recep; Aladag, Erdinc; Kul, Sinan
The removal of Basic Yellow 2 (BY2), a cationic dye, from aqueous solution by using montmorillonite as adsorbent was studied in batch experiments. The effect of pH, agitation speed, adsorbent dosage, initial dye concentration ionic strength, and temperature on the removal of BY2 was also investigated. Langmuir, Freundlich, Temkin, and Dubinin-Radushkevich isotherms were applied to fit the adsorption data of BY2 dye. Equilibrium data were well described by the typical Langmuir adsorption isotherm. The maximum monolayer adsorption capacity was calculated as 434.196 mg g(-1) from the Langmuir isotherm model. The adsorption data was fitted to both the pseudo-first-order, pseudo-second-order, Elovich, and intraparticle kinetic models, and the calculated values of the amount adsorbed at equilibrium (q(e)) by pseudo-second-order equations were found to be in good agreement with the experimental values. The thermodynamic factors were also evaluated. The entropy change (Delta S*) was negative, suggesting that the adsorption process decreases in entropy and enthalpy change (Delta H*) was positive which indicates endothermic nature. The positive Delta G* value confirms the un-spontaneity of the process. In addition, a semiempirical model was calculated from kinetic data.
Investigation of the Treatment of Olive Mill Wastewater by Electrooxidation
(Springer int Publ Ag, 2022) Kul, Sinan; Boncukcuoglu, Recep; Torun, Fatma Ekmekyapar; Recber, Zuleyha; Sozudogru, Onur; Aladag, Erdinc
The electrooxidation process, one of the advanced oxidation processes, is one of the effective treatment processes used in treating various industrial wastewaters. This study investigated the treatment of olive mill wastewater using the electrooxidation process. This study includes the effects of different experimental parameters on chemical oxygen demand and total phenol removal efficiencies in olive mill wastewater. Ti/IrO2/RuO2 mesh plates as anode material and Ti mesh plates as cathode material were used in the study. The effects of stirring rate, dilution factor, pH, type of support electrolyte, the concentration of support electrolyte, and current density on chemical oxygen demand and total phenol removal efficiencies were examined in the experiments using a batch reactor. The study found that the chemical oxygen demand and total phenol removal rates were 96.93% and 100% under optimum conditions, respectively. According to the treatment data obtained, it can be said that olive mill wastewater can be treated by the electrooxidation method and can be proposed as a pretreatment system before entering biological treatment.