title: Sonochemical degradation of methyl orange in the presence of Bi2WO6: Effect of operating parameters and the generated reactive oxygen species.
abstract: The Bi2WO6 was prepared by the hydrothermal method and its sonocatalytic activity was studied in the degradation of methyl orange (MO) solutions. The effects of catalytic activity of Bi2WO6 on dye were inspected by the change in absorbance of dye with UV-vis spectrometer. The influences of operational parameters such as the addition amount of Bi2WO6, pH, the initial concentration of dyes, ultrasonic power and irradiation time on the degradation ratio were investigated. In addition, the obtained results indicated that the kinetics of sonochemical reactions of MO were consistent with the pseudo first-order kinetics and Bi2WO6 had excellent reusability and stability during the sonochemical degradation processes. The generation and kinds of reactive oxygen species (ROS) and their influence on the sonochemical degradation of MO were determined by the methods of oxidation-extraction spectrophotometry and ROS scavengers. The results indicate that the degradation of MO in the presence of Bi2WO6 under ultrasonic irradiation is related to the generation of ROS, in which both singlet molecular oxygen ((1)O2) and hydroxyl radical (OH) play important roles in the sonochemical degradation of MO. These experimental results provide a sound foundation for the further development of Bi2WO6 as a sonocatalyst in wastewater treatment.
authors.affiliation: College of Applied Chemistry, Shenyang University of Chemical Technology, Shenyang 110142, China.
authors.forename: Ling-Ling
authors.initials: LL
authors.lastname: He
authors.affiliation: College of Applied Chemistry, Shenyang University of Chemical Technology, Shenyang 110142, China.
authors.forename: Xian-Ping
authors.initials: XP
authors.lastname: Liu
authors.affiliation: College of Applied Chemistry, Shenyang University of Chemical Technology, Shenyang 110142, China.
authors.forename: Yong-Xia
authors.initials: YX
authors.lastname: Wang
authors.affiliation: College of Applied Chemistry, Shenyang University of Chemical Technology, Shenyang 110142, China.
authors.forename: Zhi-Xin
authors.initials: ZX
authors.lastname: Wang
authors.affiliation: College of Applied Chemistry, Shenyang University of Chemical Technology, Shenyang 110142, China.
authors.forename: Yan-Jie
authors.initials: YJ
authors.lastname: Yang
authors.affiliation: College of Applied Chemistry, Shenyang University of Chemical Technology, Shenyang 110142, China.
authors.forename: Yan-Ping
authors.initials: YP
authors.lastname: Gao
authors.affiliation: College of Pharmacy, Liaoning University, Shenyang 110036, China. Electronic address: liubinzehao@163.com.
authors.forename: Bin
authors.initials: B
authors.lastname: Liu
authors.affiliation: College of Pharmacy, Liaoning University, Shenyang 110036, China. Electronic address: xin_wang@lnu.edu.cn.
authors.forename: Xin
authors.initials: X
authors.lastname: Wang
keywords: Bi(2)WO(6); Methyl orange; Reactive oxygen species; Sonochemical degradation; Ultrasonic irradiation