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    Adsorption of Acid Violet 17 onto Acid-Activated Pistachio Shell: Isotherm, Kinetic and Thermodynamic Studies
    (Slovensko Kemijsko Drustvo, 2020) Senturk, Ilknur; Alzein, Mazen
    The pistachio shell was modified using different chemical agents and utilized as an adsorbent for the adsorption of AV 17 dye in an aqueous solution. Maximum removal of 93.04% was obtained for pistachio shell activated with 10 NH2SO4 . The physicochemical properties of activated pistachio shell were characterized by pH(pzc), FTIR, BET, and SEM-EDX analysis. The results showed that the AV 17 adsorption capacity was positively correlated to the BET surface area. The best fit of kinetic data to pseudo-second-order kinetic was determined. The adsorption follows both the Langmuir and Temkin isotherms. The Langmuir adsorption capacity was determined to be 26.455 mg/g at the initial dye concentration of 160 mg/L. The endothermic nature of adsorption was confirmed by the acquired thermodynamic data. Maximum desorption of 97.33% was achieved in 0.2 M NaOH for AAPS in the first cycle. This is very important for the economic use of the adsorbent. The findings demonstrate that activated pistachio shell may be a good alternative for color removal from industrial effluents.
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    Adsorptive removal of basic blue 41 using pistachio shell adsorbent-Performance in batch and column system
    (Elsevier, 2020) Senturk, Ilknur; Alzein, Mazen
    In present study, pistachio shell was used as an adsorbent to remove Basic blue 41 dye (BB 41) from textile wastewater effluents with a batch and a continuous system. The structure and characteristics of the pistachio shell were determined by pH pzc , FTIR spectroscopy, BET surface area and SEM-EDX analysis. A batch system was used to investigate the effects of dye concentration, pH, quantity and particle size of adsorbent, reaction dura- tion, temperature and ion strength on dye removal performance were investigated. The error analysis methods were employed to get adsorption kinetics and the best -fitting isotherm models for adsorption of BB 41 dye. The results of modeling studies proved that Langmuir isotherms and pseudo -second -order kinetics the best repre- sented adsorption kinetics and isotherm data. Present findings revealed that BB 41 removal was a feasible, spontaneous and endothermic process. Decreasing removal (%) rates were with increasing NaCl and SDS con- centrations. After three cycles, regeneration efficiency was calculated as 65.39%. Continuous mode of operation was used for optimization of process parameters such as initial pollutant concentration, effluent flow rate and bed height. In continuous system, maximum adsorption capacity was identified as 41.77 mg/g. The Adams- Bohart, Thomas and Yoon-Nelson models were used to find of the best fitting model for experimental data of continuous mode of operation. Pistachio shell had yielded quite high adsorption of dye, thus it was also conduced that pistachio shell could effectively and reliably be utilized in treatment of wastewater effluents of textile in- dustry containing Basic blue 41 textile dye.
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    Biosorption of phenol from aqueous solutions by the Aspergillus niger biomass: comparison of linear and non-linear regression analysis
    (TAYLOR & FRANCIS INC, 2016) Senturk, Ilknur; Buyukgungor, Hanife; Geyikci, Feza
    In this study, the removal characteristics of phenol from aqueous solution by the live Aspergillus niger were investigated under various operating variables like contact time, initial phenol concentration, biomass dosage, and temperature. The biosorption of phenol reached equilibrium in 48h. The maximum loading capacity of the sorbent was also found to be 30.0mg/g for live A. niger at an initial phenol concentration of 550mg/L. Kinetic evaluation of experimental data showed that the biosorption of phenol on A. niger conformed closely to the intra particle diffusion model. Langmuir and Freundlich models were applied to describe the biosorption isotherms. Akaike's information criterion (AIC) values were calculated for Langmuir (6.54) and Freundlich (12.45) isotherms, respectively. Having a smaller AIC value suggests that Langmuir isotherm is more likely to be a better fit. Thermodynamic parameters such as standard Gibbs free energy (G degrees), standard enthalpy (H degrees), and standard entropy (S degrees) were obtained by applying the Van't Hoff equation. The thermodynamics parameters indicated that the biosorption was spontaneous and endothermic. This research showed that fungal biosorption has a potential to be used in the removal of phenol from wastewaters.
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    Effective adsorption of Congo red by eco-friendly granite-modified magnetic chitosan nanocomposite (G@Fe3O4@CS)
    (Springer Heidelberg, 2023) Senturk, Ilknur
    Congo red (CR) is one of the most common dyes that require special attention due to its harmfulness and high persistence in the aquatic environment. This study aimed to remove carcinogenic CR from water using a Granite/Iron oxide/Chitosan (G@Fe3O4@CS) nanocomposite. The G@Fe3O4@CS nanocomposite was synthesized using the coprecipitation method. The synthesized nanocomposite was characterized using SEM, EDX, FTIR, and XRD methods. The effects of various parameters, namely solution pH, adsorbent dosage, initial concentration of CR, experiment duration, temperature, co-existing anions, and reusability of NCs, were also investigated. The highest removal for 100 mg/L CR, with a removal effectiveness of 93.78%, was recorded at 60 C-degrees. Thermodynamics, isotherms, and kinetics were investigated for adsorption mechanisms. The study demonstrated that all sorption processes were better suited to the pseudo-second-order equation (R-2 = 0.999) and the Langmuir equation (R-2 = 0.9909 with q(max) = 63.69 mg/g at 288 K). The nature of the process is spontaneous, endothermic, and characterized by increased randomness, as indicated by thermodynamic properties. Desorption studies showed that G@Fe3O4@CS can remove 86.22% of Congo red; under the same conditions, the removal rate was 76.82% and 47.62% after three and five adsorption cycles, respectively. The simple and eco-friendly manufacturing process, effective adsorption procedure, rapid magnetic separation, and all experimental results indicated that G@Fe3O4@CS could be a potential adsorbent for the adsorptive removal of wastewater containing CR dye.
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    Highly efficient removal from aqueous solution by adsorption of Maxilon Red GRL dye using activated pine sawdust
    (Korean Institute Chemical Engineers, 2020) Senturk, Ilknur; Yildiz, Muhammed Reha
    Pine sawdust, to which sulfuric acid was applied (APSD), was utilized as an inexpensive adsorbent to perform the batch adsorptive removal from a synthetic dye solution of Maxilon Red GRL (MR GRL). The activated adsorbent was characterized by the points of zero charge, FTIR, N-2 adsorption-desorption, SEM, and SEM-EDX analyses. According to the removal results, the highest efficiency of the dye adsorption was reached at 180min. MR GRL removal of 99.35% was achieved using APSD under the optimum conditions (pH=5.7-6.0, temperature=298 K, dye concentration= 250mg/L, and adsorbent dosage=8 g/L). The Langmuir isotherm represents the best explanation model for the experimental data, which has the highest adsorption capacity of 312.5mg/g at 318 K. The compatibility of adsorption with the Langmuir isotherm showed that adsorption was reversible and physical. The other results obtained confirmed this situation. The kinetic research demonstrated that the sorption process was realized in accordance with the pseudo-second-order kinetic model. The thermodynamic parameters revealed that the MR GRL adsorption occurred spontaneously and was exothermic. The findings of the present research confirm that acid-activated pine sawdust may be utilized to remove MR GRL dye from aqueous solutions as a low-cost and efficient adsorbent.
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    Use of magnetic nanoparticle loaded functionalized multi-walled carbon nanotubes for effective removal of Maxilon red GRL from aqueous solutions
    (Springer, 2025) Senturk, Ilknur; Cakmak, Nese Keklikcioglu
    In this study, acid-functionalized multi-walled carbon nanotubes (MWCNTs-COOH) were synthesized by subjecting them to acid treatment and subsequently incorporating magnetite (Fe3O4) nanoparticles onto their surface (MWCNTs-COOH/Fe3O4) through co-precipitating Fe2+ and Fe3+ in the MWCNTs-COOH colloidal suspension. These were then subjected to comprehensive characterization using X-ray diffraction (XRD), scanning electron microscopy (SEM), energy-dispersive X-ray analysis (EDX), dynamic light scattering (DLS), Fourier transform infrared spectroscopy (FTIR), Brunauer-Emmett-Teller surface area analysis (BET), and Vibrating sample magnetometer (VSM). The adsorption efficiency of the synthesized MWCNTs-COOH/Fe3O4 nanocomposite for the removal of Maxilon Red GRL dye (MR GRL) from aqueous solutions was examined under various conditions, including initial MR GRL concentration (50-250 mg/L), solution pH (2-12), adsorbent dose (0.1-1.0 g/L), and temperature (25-55 degrees C). Results indicated that the MWCNTs-COOH/Fe3O4 nanocomposites displayed strong adsorption capabilities for MR GRL in aqueous solutions, and the adsorption process adhered to the Langmuir isotherm model. Kinetic adsorption data were well-fitted to the pseudo-second-order model. At the natural pH of 5.8 and a temperature of 25 degrees C, the adsorption capacity and removal percentage were determined as 188.68 mg/g and 97%, respectively. The adsorption of MR GRL onto MWCNTs-COOH/Fe3O4 was endothermic and spontaneous, according to thermodynamic characteristics. These findings indicate the potential of the newly synthesized adsorbent in advancing water purification through effective adsorptive separation. [GRAPHICS]