Akademik Veri Yönetim Sistemi
Separation Science and Technology (Philadelphia), cilt.60, sa.11, ss.1406-1420, 2025 (SCI-Expanded, Scopus)
This study investigates the adsorption of methyl blue (MB) onto sodium aluminum borate (Na2Al2B2O7) from aqueous solutions. Na2Al2B2O7 was synthesized by a solution combustion technique at 850 ℃ for 6 hours in air. The phase study of the adsorbent was conducted utilizing powder X-ray diffraction (XRD). The bond structure and morphological formation of Na2Al2B2O7 were examined by using FT-IR and SEM, respectively. The morphological characteristics of the adsorbent particles were examined using a scanning electron microscope (SEM), revealing that the particles generally exhibit sizes ranging between 1 and 5 micrometers. The effects of parameters such as initial methyl blue concentration, temperature, contact time, adsorbent dose and pH on the adsorbed methyl blue were tested. In adsorption experiments performed with an initial methyl blue concentration of 500 mg/L, a contact time of 60 minutes and an adsorbent dose of 0.1 g, the maximum adsorption capacity was calculated as 98.990% at pH 2. It was observed that the process was more suitable for the Langmuir adsorption model (qmax = 2000 mg/g). The data were evaluated in terms of thermodynamics and kinetics. It was determined to have negative Gibbs free energy change (ΔG), negative adsorption entropy (ΔS) and positive adsorption enthalpy (ΔH). It was concluded that the adsorption process follows the pseudo-second-order kinetic model.