Alfa- Bismuth(III)oxide catalyzed Biginelli reactions using experimentally designed optimized condition

α-Bi۲O۳ was synthesized via a hydrothermal method at ۱۸۰ °C for ۱۲ h in ۱ (S۱) and ۲ (S۲) M KOH aqueous solutions, using Bi(NO۳)۳•۵H۲O as raw material. The synthesized material was characterized by X-ray powder diffraction (XRPD) technique. The XRPD results indicated that by using ۱M KOH aqueous solution, α-Bi۲O۳ was obtained with small fractions of β-Bi۲O۳, while ۲M KOH solution resulted in pure α-Bi۲O۳. The α-Bi۲O۳ was crystallized in a monoclinic crystal structure with space group of P۲۱/c. The size and morphologies of the synthesized material was studied by field emission scanning electron microscope (FESEM). The FESEM images showed that the obtained material had multigonal structures in micron dimensions. The synthesized material was tested as catalyst in Biginelli reactions and excellent performance was achieved in the optimized conditions. Experimental design was used to obtain optimized reaction conditions. Also the optical properties of the obtained material were studied by ultraviolet visible (UV-Vis) diffuse reflectance spectrum (DRS).

Keywords:

Bi۲O۳ , Hydrothermal method , Experimental Design , Biginelli