نوع مقاله : علمی و پژوهشی
عنوان مقاله English
نویسندگان English
In this study, MgAl₂O₄ nanopowders were synthesized using the solution combustion synthesis (SCS) method with cladophora and urea as fuels. Cladophora is a filamentous green alga characterized by relatively rapid growth, abundant biomass, and high cellulose content, making it a promising candidate for use as a biofuel. The crystal structure, microstructure, and optical properties of the products were investigated using X-ray diffraction (XRD), field-emission scanning electron microscopy (FESEM), photoluminescence (PL), and UV-Vis diffuse reflectance spectroscopy (DRS). XRD results indicated that the as-synthesized samples initially exhibited relatively low crystallinity; however, calcination significantly improved crystallinity and structural order, leading to the formation of the cubic MgAl₂O₄ crystal structure. The average particle sizes for the samples synthesized using cladophora and urea were found to be approximately 35 nm and 20 nm, respectively. Both samples demonstrated strong absorption in the ultraviolet region, peaking at a wavelength of approximately 265 nm. The energy bandgaps for the samples prepared with cladophora and urea were determined to be 5.81 eV and 6.02 eV, respectively. Furthermore, photoluminescence results revealed that upon excitation at 394.8 nm, the samples exhibited distinct emission in the yellow-orange region, with a maximum at approximately 591 nm. These results indicate that the use of cladophora as a biofuel can enable the synthesis of MgAl₂O₄ nanopowders with remarkable structural and optical properties.
کلیدواژهها English
