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    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, Hulya
    In 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.
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    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, Ugur
    Numerous 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.