title: Degradation of m-xylene solution using ultrasonic irradiation.
abstract: This study is to apply ultrasound to remove m-xylene, a volatile compound from aqueous solutions which causes environmental damage. High frequency ultrasound was used to investigate the effect of different operational parameters, such as m-xylene initial concentration, ultrasonic frequency and ultrasonic power. The degradation rate of m-xylene was increased with decreasing initial concentration of m-xylene and increasing frequency and power. Optimal conditions include 26.07 mg/L, 806.3 kHz and 70±1 W, in which MnO(2), Cu(2+), Fe(2+), and H(2)O(2) had little or no effect on the degradation. Moreover, the effect of radical scavengers such as Na(2)CO(3) and t-butyl was not obvious, which indicates that direct pyrolysis inside the collapsing bubbles has an important role in m-xylene ultrasonic removal. In addition, the degradation of m-xylene was observed to behave under pseudo-first-order kinetics with different experimental conditions tested in the present work.
authors.affiliation: College of Construction and Environment Engineering, Shenzhen Polytechnic, Shenzhen, Guangdong Province, China. xiewp@szpt.edu.cn
authors.forename: Weiping
authors.initials: W
authors.lastname: Xie
authors.forename: Yan
authors.initials: Y
authors.lastname: Qin
authors.forename: Dingmin
authors.initials: D
authors.lastname: Liang
authors.forename: Dan
authors.initials: D
authors.lastname: Song
authors.forename: Dewen
authors.initials: D
authors.lastname: He
mesh_terms: D011829:Radiation Dosage; D012996:Solutions; D013010:Sonication / Q000379:methods*; D014874:Water Pollutants, Chemical / Q000737:chemistry* / Q000302:isolation & purification* / Q000528:radiation effects; D018508:Water Purification / Q000379:methods*; D014992:Xylenes / Q000737:chemistry* / Q000302:isolation & purification* / Q000528:radiation effects
chemical_list: D012996:Solutions; D014874:Water Pollutants, Chemical; D014992:Xylenes