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    Removal of methyl blue (MB) from aqueous solution using strontium aluminoborate (SrAl2B2O7): synthesis, characterization and adsorption studies
    (Taylor & Francis Inc, 2024) Bayram, Okan; Gode, Fethiye; Pekgozlu, Ilhan
    Today, increasing dyes pollution is of great importance for life. Leaving the dyes used in industries such as textiles without being discharged pollutes other water sources. In order to prevent this, different methods are used in the literature. In this study, SrAl2B2O7, a borate metal, was used to remove methyl blue (MB), an anionic dye, by batch adsorption method. Strontium aluminoborate (SrAl2B2O7) was prepared using a solution combustion method at 950 degrees C for 4 h in air. The prepared adsorbent was characterized by X-ray diffraction (XRD) and Fourier transform infrared spectroscopy (FT-IR). The particle morphology of the adsorbent was investigated using scanning electron microscope (SEM). By using N-2 adsorption-desorption, the Brunnauer, Emmet, and Teller (BET) specific surface area was found to be 1.9578 m(2) g(-1). The surface charge of the dye-adsorbed SrAl2B2O7 was determined based on zeta-potential measurements. Langmuir (R-2=0.9897), Freundlich (R-2=0.985), Dubinin & Radushkevic (R-2=0.976), Scatchard (R-2=0.881), Temkin & Pyzhev (R-2=0.978) isotherms were calculated in the study. SrAl2B2O7 showed good adsorption performance for methyl blue (MB) with maximum adsorption capacities of 29.069 mg g(-1) (Langmuir). Adsorption processes were also studied in detail. Thermodynamic and kinetic models; pseudo-first-order (R-2=0.415), pseudo-second-order (R-2=0.999), Elovich (R-2=0.968) showed that adsorption using SrAl2B2O7 in MB removal is endothermic and pseudo-second order.
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    Use of Sr2Mg(BO3)2 in Congo red removal from aqueous solutions: Synthesis, adsorption, isotherm, kinetic study
    (Taylor & Francis Inc, 2023) Bayram, Okan; Moral, Emel; Pekgozlu, Ilhan; Gode, Fethiye
    Sr2Mg(BO3)(2) was prepared by a solution combustion method at 900 degrees C for 6 hour in air. The prepared adsorbent was characterized by X-Ray Diffraction (XRD). The XRD pattern of Sr2Mg(BO3)(2) is in agreement with the ICDD File No: 01-076-9795. The particle morphology of the adsorbent was investigated by scanning electron microscope (SEM). The average size of particles is about 3-10 mu m. The Congo red dye was removed from aqueous solution using Sr2Mg(BO3)(2). The effect of time, initial concentration, pH, temperature and dosage on adsorption were investigated. The Freundlich model fitted according to equilibrium data and maximum adsorption capacity is 886.952 mg/g. According to theories of pseudo-second-order kinetics, the removal procedure involves chemical adsorption. According to the thermodynamic data, negative Delta G values indicated that adsorption of Sr2Mg(BO3)(2) occurred spontaneously and negative Delta H values, the adsorption process was exothermic. Sr2Mg(BO3)(2) is a useable material for Congo red dye removal.