Photocatalytic degradation of chlorpyrifos in aqueous suspensions using nanocrystals of ZnO and TiO2

Kanmoni, V. Gnana Glory; Daniel, Sheeba; Raj, G. Allen Gnana

doi:10.1007/s11144-012-0433-5

Cited by 38 publications

(22 citation statements)

References 22 publications

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“…The authors suggest treatment under natural solar conditions will give better results as compared to UV treatment. Similar photocatalytic degradation of chlorpyrifos in aqueous suspensions under solar light using nanocrystals of ZnO has also been demonstrated (Kanmoni et al 2012). However, many investigators reported the ability of TiO 2 to exhibit a better photocatalytic activity on the degradation of chlorpyrifos than that of ZnO under same photocatalytic reaction conditions (Kanmoni et al 2012;Fadaei and Kargar 2013).…”

Section: Physical and Chemical Remediation Strategiessupporting

confidence: 53%

Chlorpyrifos: pollution and remediation

2015

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The widespread use of pesticides in modern agriculture is of increasing concern due to environmental contamination and subsequent biodiversity loss. Chlorpyrifos is a toxic organophosphate pesticide. Repeated applications of chlorpyrifos modify the soil microbial community structure and pose potential health risks to the other nontargets. Chlorpyrifos has been reported as the second most commonly detected pesticide in food and water. Extensive use of chlorpyrifos in agriculture and persistence in the environment have raised public concern and demand for safe technologies to overcome the pollution and toxicity problems. Here, we review pollution and toxicity issues associated with chlorpyrifos use and discuss strategies to solve pesticide contamination. Chlorpyrifos, previously shown to be resistant to enhanced degradation, has now been proved to undergo enhanced microbe-mediated decay. Here, special emphasis is given to degradation methods such as ozonation, Fenton treatment, photodegradation, and advanced oxidation processes along with microbial degradation. Finally, we focus on degradation process at enzyme and molecular levels which will enable us to elucidate the exact degradative pathway involved in biodegradation.

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Section: Physical and Chemical Remediation Strategiessupporting

confidence: 53%

Chlorpyrifos: pollution and remediation

2015

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“…This speculation is consistent with the obtained TOF mass spectra. Some discrepancies may exist between the degradation products of chlorpyrifos in this study and those in wastewater and in aqueous suspensions [3], which may be due to the different degradation conditions such as light, catalyst, and electrolysis.…”

Section: Heterogeneous Reaction Productsmentioning

confidence: 71%

“…It is widely applied in agriculture [1][2][3][4], animal houses [5], and in the control of household pests, such as subterranean termites [2,6,7]. Chlorpyrifos inhibits acetylcholinesterase activity and protein synthesis and affects the functions of cells, axons, and brain [7].…”

Section: Chlorpyrifosmentioning

confidence: 99%

“…In a word, chlorpyrifos oxon and TCP are two primary transformation products of chlorpyrifos, which are derived from the oxidation of the P S double bond into the P O bond and hydrolysis at the P O bond adjacent to the benzene ring, respectively. Although many researches have been conducted on the degradation of chlorpyrifos by photolysis [3,20], hydrolysis [10], and microorganisms [21], most of them have focused on the transformations of chlorpyrifos in soil and water. Chlorpyrifos can exist in both gas and particle phases in the ambient atmosphere because of its semivolatile nature (1.8 × 10 −5 mm Hg at 25 • C) [22][23][24][25].…”

Section: Chlorpyrifosmentioning

confidence: 99%

“…The tropospheric lifetime of particle-phase chlorpyrifos at lower tropospheric concentration of NO 3 radicals at night (5 × 10 8 molecules cm −3 ) [45] is estimated to be 9.8 min ( = 1/(k p chl ) eff [NO 3 ]). However, the lifetime of atmospheric chlorpyrifos particles may be much longer than 9.8 min.…”

Section: Effective Rate Constantmentioning

confidence: 99%

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Heterogeneous reaction of particulate chlorpyrifos with NO 3 radicals: Products, pathways, and kinetics

Zhang

Yang

et al. 2014

Chemical Physics Letters

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a b s t r a c tChlorpyrifos is a typical chlorinated organophosphorus pesticide. The heterogeneous reaction of chlorpyrifos particles with NO 3 radicals was investigated using a vacuum ultraviolet photoionization aerosol time-of-flight mass spectrometer (VUV-ATOFMS) and a real-time atmospheric gas analysis mass spectrometer. Chlorpyrifos oxon, 3,5,6-trichloro-2-pyridinol, O,O-diethyl O-hydrogen phosphorothioate, O,O-diethyl ester thiophosphoric acid, diethyl hydrogen phosphate and a phosphinyl disulfide compound were identified as the main degradation products. The heterogeneous reaction pathways were proposed and their kinetic processes were investigated via a mixed-phase relative rate method. The observed effective rate constant is 3.4 ± 0.2 × 10 −12 cm 3 molecule −1 s −1 .

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