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Öğe ASSESSMENT OF ORANGE PULP DERIVED ACTIVATED CARBON AS AN ECO-FRIENDLY ADSORBENT IN REACTIVE BLUE 49 REMOVAL(Parlar Scientific Publications (P S P), 2022) Gunes, Sinem; Angin, Dilek; Ates, Asude; Tan, Burcu; Selengil, Ugur; Demirel, HulyaIn this study, activated carbon derived from orange (Citrus sinensis L.) pulp was used to remove Reactive Blue 49 from aqueous solutions. Activated carbon was produced by chemical activation method at an activation temperature 500 degrees C with a 3:1 impregnation ratio (ZnCl2 : orange pulp). The effects of various adsorption parameters (solution pH, activated carbon dosage, initial dye concentration, solution temperature, and contact time) on the dye removal were investigated. The maximum dye adsorption capacity (78.74 mg/g) was achieved at pH 2, with 0.4 g of adsorbent, an initial dye concentration of 100 mg/L, and a solution temperature of 45 degrees C. The equilibrium data were well defined by the Langmuir isotherm model, and the kinetic data exhibited the best fit with the pseudo-second-order model. Thermodynamic parameters indicated that the dye adsorption was endothermic and spontaneous.Öğe Boron removal from wastewater by direct contact membrane distillation system using two-level factorial design(Taylor and Francis Ltd., 2023) Tan, Burcu; Yıldız, Semanur; Angin, Dilek; Bektaş, Tijen Ennil; Selengil, UgurNumerous industries use boron and its compounds in various applications. In this study, the removal of boron from an aqueous solution by direct contact membrane distillation (DCMD) system. A 23 full factorial experimental design was implemented to determine the optimum values and the degree of importance of the parameters. The experiments were performed at low and high levels of temperature, initial pH, and feed boron concentration. Design variables were evaluated in terms of individual, binary, and triple effects. At the 95% confidence level, the temperature–initial pH interaction was found as the most significant factor. The maximum boron removal efficiency can be achieved either at a low level of temperature (30 °C) and pH (4.0), or a high level of temperature (50°C) and pH (11) combinations at 20 mg/L boron concentration with desirability of 0.957.Öğe Effect of activated carbon produced from biochar on removal of 2, 4-dichlorophenoxy acetic acid from aqueous solutions(National Institute of Science Communication and Information Resources, 2021) Angin, Dilek; Güneş, Sinem; Ateş, Asude; Selengil, Uğur; Altıntığ, Esra; Tan, Burcu; Demirel, HülyaThe toxicity of pesticides and their degradation products is making these chemical substances a potential hazard by contaminating our environment. Therefore, the removal of pesticides from water is one of the major environmental concerns these days. 2,4-Dichlorophenoxy acetic acid (2,4-D) belonging to the herbicide group, which is among the numerous pesticides used today, is widely used to control weeds due to its low cost and good selectivity. In order to offer an alternative to this environmental problem, the effect of activated carbon obtained by chemical activation from pyrolysis biochar on 2,4-dichlorophenoxy acetic acid removal from aqueous solutions has been investigated. The adsorption mechanism is explained by analyzing the effect of adsorption parameters. It is determined that the equilibrium data are suitable for Langmuir isotherm model among the applied isotherm models and the monolayer adsorption capacity is 344.83 mg g-1 at 318 K. The adsorption kinetics data of 2,4-D on activated carbon is better defined by the pseudo-second-order model. Thermodynamic calculations reveal that the adsorption process is spontaneous and endothermic. The activated carbon obtained from biochar has been observed to have a high adsorption capacity compared to adsorbent materials obtained from many other raw materials for the removal of 2,4-Dichlorophenoxy acetic acid.Öğe PRODUCTION AND CHARACTERIZATION OF ACTIVATED CARBON PREPARED FROM ORANGE PULP AND UTILIZATION FOR THE REMOVAL OF PHOSPHATE IONS(Parlar Scientific Publications (P S P), 2018) Bektas, T. Ennil; Angin, Dilek; Gunes, SinemIn this study, the use of activated carbon prepared from orange (Citrus sinensis L.) pulp by chemical activation has been investigated as an ideal alternative to the current expensive methods of removing phosphate ions. The effects of initial pH, initial concentration, contact time, temperature and other ions on adsorption were studied. The surface area and micropore volume of the obtained activated carbon were 1779.48 m(2) g(-1) and 1.1 cm(3) g(-2), respectively. The results indicated that the adsorption of phosphate ions followed a pseudo-second-order kinetic model and fitted the Langmuir and Temkin isotherm models better than other isotherm models. The maximum adsorption capacity obtained from Langmuir equation was 4.61 mg g(-1). The calculated thermodynamic parameters were showed that the adsorption of phosphate ions onto activated carbon was feasible, spontaneous and exothermic at 298-318 K. The results suggest that the activated carbon prepared from orange pulp has potential in remediation of phosphate ions contaminated waters.Öğe Reduction dye in paint and construction chemicals wastewater by using microwave radiation method(Parlar Scientific Publications, 2021) Bektaş, Tijen Ennil; Angin, DilekIn this study, a novel process, microwave (MW) radiation, was used for the removal of dye from wastewater of paint and construction chemicals producing factory in Turkey. This process was the combination of MW irradiation, MW adsorbent (as catalyst), coagulant and oxidant. The activated carbon prepared from olive-waste cake by chemical activation was investigated as an MW adsorbent. Aluminum sulfate and hydrogen peroxide were used as coagulant and oxidant, respectively. The effects of radiation time, adsorbent dosage, coagulant and oxidant on the dye removal were investigated. The surface area and micropore volume of activated carbon was 1418 m(2)/g and 0.197 cm(3)/g, respectively. The presence of hydrogen peroxide showed no effect on dye removal. It has been demonstrated that the color can be effectively removed from wastewater by using activated carbon and aluminum sulphate in combination with microwave radiation. Experiments were also performed for the use of only coagulant (aluminum sulphate) and it was observed that the dye was well removed from the wastewater when the amount of coagulant was more than 0.1 g / 100 mL. Results suggest that the activated carbon obtained from olive-waste cake has potential in remediation of dye contaminated waters.
