Preparation of ortho-symmetric double (OSD) Z-scheme SnO2\CdSe/Bi2O3 sonocatalyst by ultrasonic-assisted isoelectric point method for effective degradation of organic pollutants

In this work, an ortho-symmetric double (OSD) Z-scheme SnO2\CdSe/Bi2O3 sonocatalyst is skillfully designed and synthesized via ultrasonic-assisted isoelectric point method and then the sonocatalytic activity is studied under ultrasonic irradiation in the degradation of organic contaminants. The effects of ultrasonic irradiation time, sonocatalyst dosage, initial Rhodamine B concentration, organic dye kind and used times are investigated systemically. The formation of (OH)-O-center dot and h(+) are confirmed by using t-BuOH and oxalate, respectively. The Rhodamine B can completely be degraded under given experimental conditions such as 10 mg/L Rhodamine B solution, 1.00 OSD Z-scheme SnO2\CdSe/Bi2O3 dosage and 150 min ultrasonic process. The formation of mainly intermediate products is studied by Liquid Chromatography-Mass Spectrometry. Moreover, the sonocatalytic reaction mechanism caused by OSD Z-scheme SnO2\CdSe/Bi2O3 is presented. (C) 2019 The Korean Society of Industrial and Engineering Chemistry. Published by Elsevier B.V. All rights reserved.