Preparation of Er 3+ :Y 3 Al 5 O 12 /WO 3 -KNbO 3 composite and application in treatment of methamphetamine under ultrasonic irradiation.

Er3+ :Y3 Al5 O12 /WO3 -KNbO3 composite powder as an effective sonocatalyst was prepared via collosol-gelling-hydrothermal and high-temperature calcination methods. The textures of materials were observed by X-ray diffractometer (XRD), scanning electron microscopy (SEM) and X-ray photoelectron spectroscopy (XPS). In order to estimate the sonocatalytic activity of Er3+ :Y3 Al5 O12 /WO3 -KNbO3 composite powder, the sonocatalytic degradation of methamphetamine (MAPA) was performed. Furthermore, the influences of mass ratio of WO3 and KNbO3 , ultrasonic irradiation time, catalyst addition amount, initial methamphetamine (MAPA) concentration and used times on the sonocatalytic degradation of methamphetamine (MAPA) caused by Er3+ :Y3 Al5 O12 /WO3 -KNbO3 composite powder were investigated by using gas chromatography. Under optimal conditions of 1.00g/L Er3+ :Y3 Al5 O12 /WO3 -KNbO3 addition amount and 10.00mg/L methamphetamine (MAPA) initial concentration, 68% of methamphetamine (MAPA) could be removed after 150min ultrasonic irradiation. The experimental results showed that the Er3+ :Y3 Al5 O12 /WO3 -KNbO3 as sonocatalyst displayed an excellent sonocatalytic activity in degradation of methamphetamine (MAPA) under ultrasonic irradiation.