Sonolytic degradation of parathion and the formation of byproducts

Juan Juan Yao, Nai Yun Gao, Yang Deng, Yan Ma, Hai Jun Li, Bin Xu, Lei Li

Research output: Contribution to journalArticleResearchpeer-review

9 Citations (Scopus)

Abstract

Ultrasonic degradation of parathion has been investigated in this study. At a neutral condition, 99.7% of 2.9 μM parathion could be decomposed within 30 min under 600 kHz ultrasonic irradiation at ultrasonic intensity of 0.69 W/cm2. The degradation rate increased proportionally with the increasing ultrasonic intensity from 0.10 to 0.69 W/cm2. The parathion degradation was enhanced in the presence of dissolved oxygen due to formation of more {radical dot}OH, but was inhibited in the presence of nitrogen gas owning to the free radical scavenging effect in vapor phase within the cavitational bubbles. CO32 -, HCO3-, and Cl- exhibited the inhibiting effects on parathion degradation, and their inhibition degrees followed the order of CO32 - >HCO3- > Cl-. But Br- had a promoting effect on parathion degradation, and the effect increased with the increasing Br- level. Moreover, both the hydrophobic and hydrophilic natural organic matters (NOM) could slow the parathion degradation, but the inhibiting effect caused by hydrophobic component was greater, especially the strongly hydrophobic NOM. The three reaction pathways of parathion sonolysis were proposed, including formation of paraoxon, formation of 4-nitrophenol, and unknown species products. The kinetics tests showed that anyone of these pathways could not be overlooked, and the fractions of the parathion decomposed in the three pathways were 28.19%, 32.92% and 38.89%, respectively. In addition, 66.61% of paraoxon produced was degraded into 4-nitrophenol. Finally, kinetics models were established to adequately predict the concentrations of parathion, paraoxon and 4-nitrophenol as a function of time.

Original languageEnglish
Pages (from-to)802-809
Number of pages8
JournalUltrasonics Sonochemistry
Volume17
Issue number5
DOIs
StatePublished - 1 Jan 2010

Fingerprint

Parathion
Byproducts
degradation
Degradation
ultrasonics
Ultrasonics
Paraoxon
Biological materials
organic matter
kinetics
Kinetics
Scavenging
scavenging
free radical
Dissolved oxygen
Free radicals
free radicals
bubble
dissolved oxygen
irradiation

Keywords

  • 4-Nitrophenol
  • Kinetics model
  • Paraoxon
  • Parathion
  • Ultrasonic irradiation

Cite this

Yao, Juan Juan ; Gao, Nai Yun ; Deng, Yang ; Ma, Yan ; Li, Hai Jun ; Xu, Bin ; Li, Lei. / Sonolytic degradation of parathion and the formation of byproducts. In: Ultrasonics Sonochemistry. 2010 ; Vol. 17, No. 5. pp. 802-809.
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abstract = "Ultrasonic degradation of parathion has been investigated in this study. At a neutral condition, 99.7{\%} of 2.9 μM parathion could be decomposed within 30 min under 600 kHz ultrasonic irradiation at ultrasonic intensity of 0.69 W/cm2. The degradation rate increased proportionally with the increasing ultrasonic intensity from 0.10 to 0.69 W/cm2. The parathion degradation was enhanced in the presence of dissolved oxygen due to formation of more {radical dot}OH, but was inhibited in the presence of nitrogen gas owning to the free radical scavenging effect in vapor phase within the cavitational bubbles. CO32 -, HCO3-, and Cl- exhibited the inhibiting effects on parathion degradation, and their inhibition degrees followed the order of CO32 - >HCO3- > Cl-. But Br- had a promoting effect on parathion degradation, and the effect increased with the increasing Br- level. Moreover, both the hydrophobic and hydrophilic natural organic matters (NOM) could slow the parathion degradation, but the inhibiting effect caused by hydrophobic component was greater, especially the strongly hydrophobic NOM. The three reaction pathways of parathion sonolysis were proposed, including formation of paraoxon, formation of 4-nitrophenol, and unknown species products. The kinetics tests showed that anyone of these pathways could not be overlooked, and the fractions of the parathion decomposed in the three pathways were 28.19{\%}, 32.92{\%} and 38.89{\%}, respectively. In addition, 66.61{\%} of paraoxon produced was degraded into 4-nitrophenol. Finally, kinetics models were established to adequately predict the concentrations of parathion, paraoxon and 4-nitrophenol as a function of time.",
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Sonolytic degradation of parathion and the formation of byproducts. / Yao, Juan Juan; Gao, Nai Yun; Deng, Yang; Ma, Yan; Li, Hai Jun; Xu, Bin; Li, Lei.

In: Ultrasonics Sonochemistry, Vol. 17, No. 5, 01.01.2010, p. 802-809.

Research output: Contribution to journalArticleResearchpeer-review

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T1 - Sonolytic degradation of parathion and the formation of byproducts

AU - Yao, Juan Juan

AU - Gao, Nai Yun

AU - Deng, Yang

AU - Ma, Yan

AU - Li, Hai Jun

AU - Xu, Bin

AU - Li, Lei

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N2 - Ultrasonic degradation of parathion has been investigated in this study. At a neutral condition, 99.7% of 2.9 μM parathion could be decomposed within 30 min under 600 kHz ultrasonic irradiation at ultrasonic intensity of 0.69 W/cm2. The degradation rate increased proportionally with the increasing ultrasonic intensity from 0.10 to 0.69 W/cm2. The parathion degradation was enhanced in the presence of dissolved oxygen due to formation of more {radical dot}OH, but was inhibited in the presence of nitrogen gas owning to the free radical scavenging effect in vapor phase within the cavitational bubbles. CO32 -, HCO3-, and Cl- exhibited the inhibiting effects on parathion degradation, and their inhibition degrees followed the order of CO32 - >HCO3- > Cl-. But Br- had a promoting effect on parathion degradation, and the effect increased with the increasing Br- level. Moreover, both the hydrophobic and hydrophilic natural organic matters (NOM) could slow the parathion degradation, but the inhibiting effect caused by hydrophobic component was greater, especially the strongly hydrophobic NOM. The three reaction pathways of parathion sonolysis were proposed, including formation of paraoxon, formation of 4-nitrophenol, and unknown species products. The kinetics tests showed that anyone of these pathways could not be overlooked, and the fractions of the parathion decomposed in the three pathways were 28.19%, 32.92% and 38.89%, respectively. In addition, 66.61% of paraoxon produced was degraded into 4-nitrophenol. Finally, kinetics models were established to adequately predict the concentrations of parathion, paraoxon and 4-nitrophenol as a function of time.

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