title: The kinetics and mechanism of ultrasonic degradation of p-nitrophenol in aqueous solution with CCl4 enhancement.
abstract: The ultrasonic degradation of p-nitrophenol (p-NP) in aqueous solution with CCl4 enhancement was studied. The effects of operating parameters such as CCl4 dosage, ultrasonic power, media temperature, the initial concentration of p-NP and initial pH value of the aqueous solution on the degradation of p-NP were investigated, and the enhancement mechanism of CCl4 for p-NP sonolysis was also discussed. The results showed that the sonochemical degradation of p-NP was obviously enhanced by adding CCl4. It attributed to the increase ·OH radicals concentration in the presence of CCl4 as a hydrogen atom scavenger, and the formation of some oxidizing agents such as free chlorine and chlorine-containing radicals. The degradation of p-NP follows a pseudo-first-order kinetics. The degradation rate of p-NP increased with decreasing the temperature, the initial pH value of the solution and decreasing the initial concentration of p-NP. It was also found that p-NP can be mineralized in this process.
authors: School of Chemistry and Chemical Engineering, University of Jinan, Jinan 250022, China. xkwang@sdili.edu.cn
authors: Xikui
authors: X
authors: Wang
authors: Yuechang
authors: Y
authors: Wei
authors: Jingang
authors: J
authors: Wang
authors: Weilin
authors: W
authors: Guo
authors: Chen
authors: C
authors: Wang
mesh_terms: D002251:Carbon Tetrachloride / Q000737:chemistry*; D006863:Hydrogen-Ion Concentration; D007700:Kinetics; D009596:Nitrophenols / Q000737:chemistry*; D012996:Solutions; D013696:Temperature; D014465:Ultrasonics; D014867:Water / Q000737:chemistry
chemical_list: D009596:Nitrophenols; D012996:Solutions; D014867:Water; D002251:Carbon Tetrachloride; C024836:4-nitrophenol