Synthesis of V_2O_5 Powders by EDTA Assistance Ultrasound Sol-gel Process

摘要

V_2O_5 powders were successfully synthesized by the EDTA assistanced ultrasound sol-gel process using NH_4VO_3 and EDTA, NH_3H_2O as raw materials. EDTA was firstly used in synthesis of V_2O_5. The synthesized activation energy and the influence of pH values and the calcination temperatures on the phases and microstructures of powders were particularly investigated. The precursor powders and the V_2O_5 powders were characterized by X-ray diffraction (XRD), fourier transform inelectron microscopy (FT-IR), scanning electron microscopy (SEM) and differential scanning calorimetry-thermal gravimetric (DSC-TG). Results show that the obtained products exhibit good crystallization under the conditions of pH=4, calcination temperature 400-500 °C and calcination time 0.5 h during the synthesizing process. The as-prepared V_2O_5 powders show preferred growth orientation along (001) plane at the pH=4. The synthesized activation energy will decrease by ultrasonic irradiation.