Document Type : Research Article
Author
Department of Chemistry, College of Science, University of Kerbala, Karbala, Iraq
Abstract
Santa Barbara Amorphous-15 (SBA-15) was synthesized by the microwave process with triblock polymer pluronic P123 (EO20PO70EO20) as the structure-direction agent and tetraethyl orthosilicate (TEOS) as the source of silica.Different approaches were used to characterize the SBA-15 such as Fourier transform infrared (FTIR) spectroscopy, X-ray diffraction (XRD), FESM-EDX, high resolution transmission electron microscopy (HRTEM), thermal gravimetric analysis (TGA) and nitrogen adsorption–desorption (BET) surface area analysis. In this work, we prepared SBA-15 at 100 oC for 20 min. As demonstrated by nitrogen adsorption-desorption, SBA-15 is a mesoporous material with a surface area, pore volume, and pore size (width) of 392.96 m2/g, 1.4493 nm and 9.285 cm3/g, respectively. The optimum conditions for Photodecolorization of Eosin yellow dye by (onto) the SBA-15 surface are, a temperature of 25 °C, an adsorbent dosage of 0.05 g, a dye concentration of 5 mg/L, and a contact period of 30 minutes. It was concluded that pseudo-First order kinetic models were the best appropriate for describing experimental data. Furthermore, thermodynamic function for active case in photo reaction (∆H#, ∆S# and ∆G#) were measured. Revealed that physical adsorption proceeded exothermically was not spontaneous, as evidenced by a positive Gibbs Free Energy change and a negative enthalpy change.
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