| Abstract: α-Bi2O3 was synthesized by microwave method using Bi(NO3)3·5H2O and glycol as raw materials. The formation mechanism was also discussed. The morphology of the products was regulated by changing temperature, pH value, reaction time, and the reagent concentrations. The products were characterized by FTIR, XRD, SEM, and nitrogen adsorption. The results show that pure α-Bi2O3 is synthesized at 120 ℃ in acidic solution. When the concentration of Bi3+ is 0.01 mol·L-1, the product is with sheet-like structure. Increasing Bi3+ concentration to 0.05 mol·L-1, flower-like α-Bi2O3 nanoparticles are formed. As the concentration of Bi3+ is further increased, the particles of the product look like porous hydrangea. When the pH value is increased to 4.5 and 6.5, the morphology changes to petal-like and floriated structures. Nitrogen adsorption results show that the nanoparticles with porous flower-like structure are with large specific surface area and absorption capacity. The optimal experimental condition for flower-like product is that the concentration of Bi(NO3)3·5H2O is 0.05 mol·L-1, the temperature is 120 ℃ and the pH value of the solution is 3. |
