22. シュウ酸エタノール沈殿法によるPb化合物の生成に対する超音波照射の影響

抄録

Precipitation of lead oxalate compound by mixing an aqueous solution of Pb(NO_3)_2 and an ethanolic solution of oxalic acid was performed in the absence or the presence of ultrasonication at 20-60℃ with addition of 1-10% ammonia water. The crystalline phases precipitated were PbC0_2O_4 (PC) and Pb_2C_2O_4(NO_3)_2・2H_2O (PCN). The ultrasonic effect on this precipitation is to promote the formation of PCN, which phase tends to be formed at lower temperatures, at lower pH, and at longer aging time. In addition, novel aspect of ultrasonic treatment for ceramic powder processing is proposed; i.e., the weak ultrasonication which is free from cavitation or sonochemistry might be applied to design the structure of the starting solutions for precise control of the precipitation process.