Degradation mechanism and the toxicity assessment in TiO2 photocatalysis and photolysis of parathion

Kim, Taksoo; Kim, Jungkon; Choi, Kyungho; Stenstrom, Michael K.; Zoh, Kyung-Duk

doi:10.1016/j.chemosphere.2005.05.038

Cited by 85 publications

(37 citation statements)

References 16 publications

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“…Besides, disappearance of parent compounds does not always indicate the successful treatment, because the degraded products may be more toxic than the parent compounds. The majority of OPPs give rise to only slight inhibition of AChE by themselves, unless they undergo oxidative activation resulting with oxon formation [17,18]. Because of that reason, complete degradation of oxon derivatives of OPPs is critical for application of oxidation processes.…”

Section: Introductionmentioning

confidence: 99%

Degradation of Malathion and Parathion by Ozonation, Photolytic Ozonation, and Heterogeneous Catalytic Ozonation Processes

Bedük

Aydın

Özcan

2011

CLEAN Soil Air Water

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The oxidation of organophosphorus pesticides (OPPs), such as malathion and parathion, in aqueous solution was studied using conventional ozonation (O 3 ), photolytic ozonation (O 3 /UV, O 3 /UV/H 2 O 2 ), and heterogeneous catalytic ozonation (O 3 /TiO 2 /UV) processes. Experiments were performed in batch mode at laboratory scale and processes were compared in terms of disappearance kinetics. The best results of pesticide mineralization were obtained when TiO 2 particles in combination with ozone (O 3 ) and UV photolysis (l ¼ 254 nm) were applied. Decomposition of 99% of parent compounds were achieved in 10 min and oxon derivatives were completely removed in 30 min. The initial reaction rate increases linearly with increasing catalyst amount. Toxicity measurements of the treated solutions were carried out in order to evaluate the efficiency of the treatment methods. No detoxification was achieved for O 3 and O 3 /UV applications. Heterogeneous photocatalytic ozonation was shown to be feasible for achieving complete decomposition of OPPs and their oxon intermediates.

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Section: Introductionmentioning

confidence: 99%

Degradation of Malathion and Parathion by Ozonation, Photolytic Ozonation, and Heterogeneous Catalytic Ozonation Processes

Bedük

Aydın

Özcan

2011

CLEAN Soil Air Water

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“…Parathion is also used as a preharvest soil fumigant and foliage treatment for a wide variety of plants, both in the field and in the greenhouse [23]. Parathion is highly toxic by all routes of exposure -ingestion, skin adsorption, and inhalation, all of which have resulted in human fatalities.…”

Section: Parathionmentioning

confidence: 99%

Electrochemical Biosensors for Pollutants in the Environment

2007

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This article reviews recent advances in electrochemical biosensing and detection of environmental pollutants. Electrochemical biosensors offer precision, sensitivity, rapidity, and ease of operation for on-site environmental analysis. An electrochemical biosensor is an analytical device in which a specific biological recognition element (bioreceptor) is integrated within or intimately associated with an electrode (transducer) that converts the recognition event to a measurable electrical signal for the purpose of detecting a target compound (analyte) in solution. This approach not only provides the means for on-site analysis but also removes the time delay and sample alteration that can occur during transport to a centralized laboratory. We first address the basic principles of merging of electrochemistry and biology into a biosensing system, and then we discuss various environmental monitoring strategies involving this technology.

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“…25 Figure 3 presents the differential pulse polarograms and UV-visible spectra of methylparathion at different irradiation times.…”

Section: (A) and Absorbance Spectra (B) Ph=30 Adjusted With Hclmentioning

confidence: 99%

Electrochemical behavior of parent and photodegradation products of some selected pesticides

et al. 2008

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Recebido em 9/4/07; aceito em 15/2/08; publicado na web 31/7/08Electrochemical behavior of pesticides is extensively studied, but little attention has been given to the study of their degradation products (by-products) by electrochemical methods. However, the degradation products of pesticides can be even more toxic then the parent products and such studies should be encouraged. Therefore, the objective of this work was to evaluate the electroactivity of by-products of imazaquin, methylparathion, bentazon and atrazine, generated by UV irradiation and measured using cyclic and differential pulse voltammetry and UV-visible absorption spectrophotometry. Results have shown that several by-products exhibit electroactivity, allowing, in some cases, the simultaneous determination of both parent and degradation products.

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Degradation mechanism and the toxicity assessment in TiO2 photocatalysis and photolysis of parathion

Cited by 85 publications

References 16 publications

Degradation of Malathion and Parathion by Ozonation, Photolytic Ozonation, and Heterogeneous Catalytic Ozonation Processes

Degradation of Malathion and Parathion by Ozonation, Photolytic Ozonation, and Heterogeneous Catalytic Ozonation Processes

Electrochemical Biosensors for Pollutants in the Environment

Electrochemical behavior of parent and photodegradation products of some selected pesticides

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