Abstract
In this study, SBA-15 mesoporous silica was synthesized, magnetized, and then functionalized with cross-linked poly(acrylic acid) (CPAA) polymer, and the resulting adsorbent (Magnetic-SBA-15/CPAA) was used to remove Acid Blue 25 from aqueous media. X-ray diffraction, field emission scanning electron microscopy, Fourier transform infrared spectroscopy, thermogravimetric analysis, Brunauer–Emmett–Teller method, and vibrating sample magnetometry were used in this study. The effective parameters on dye removal, including pH, contact time, temperature, and adsorbent dosage were investigated and optimized. The optimum condition was pH = 2, adsorbent dosage of 0.025 g, and contact time of 60 min at 25 °C. UV–vis spectrophotometer was used to determine the amount of residual dye in solution. To determine the type of adsorption isotherm, the Langmuir, Freundlich, Tempkin, and Dubinin–Radushkevich adsorption isotherm equations were used. Pseudo-first-order and pseudo-second-order models were used to determine the k...
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