Abstract
SBA-15 materials as-synthesized and impregnated with Ag nanoparticles were applied to perform adsorptive desulfurization of real diesel fuel. High-angle annular dark-field scanning transmission electron microscopy and field-emission scanning electron microscopy coupled with energy-dispersive X-ray spectroscopy (HAADF-STEM-EDX and FESEM-EDX) and X-ray photoelectron spectroscopy (XPS) results confirmed that there is uniform distribution of Ag nanodomains on the surface and in the channels of a 2AgSBA-15 (2% Ag) sample. The interaction between sulfur compounds and adsorbent mainly occurred via π-complexation mechanisms, as observed via XPS and equilibrium data. The kinetic results for 2AgSBA-15 were better fitted to the pseudo-second-order model (R2 > 0.9999), indicating that the determining step of the adsorptive process is chemisorption, whereas the equilibrium results were better fitted to the Langmuir model (R2 > 0.9994), thus indicating that the adsorption occurs on the adsorbent surface monolayer with significant adsorption capacity (qm = 20.30 mgS/g), approximately two times greater than that observed for pure SBA-15. The mean desulfurization reached by the adsorbents was up to 86.8% for six recycling steps.
Highlights
In recent years, research on the development of ordered mesoporous materials has been increasingly focused on their application in catalysis and mitigation of environmental pollutants, mainly by adsorption [1,2]
Higher adsorption was obtained for 8AgSBA-15 (8% Ag); it was not significant in comparison to the adsorbent impregnated with 2% Ag
Characterization results were elucidated for the SBA-15 material, confirming the synthesis success
Summary
Research on the development of ordered mesoporous materials has been increasingly focused on their application in catalysis and mitigation of environmental pollutants, mainly by adsorption [1,2]. Some remarkable features such as highly ordered and uniform porous structure, large pore volume, high thermal stability, and the easy obtainment and modification have attracted the interest of many researchers to microporous and mesoporous silica-based materials, such as zeolites [3], SBA-15 [4], KIT-6 [5], MSU-S [6], and MCM-41 [7]. Incorporating metal nanoparticles is the key to enhancing the adsorption of several contaminants [9]
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