Photocatalytic degradation of pesticide pyridaben in suspension of TiO2: identification of intermediates and degradation pathways

Zhu, Xinle; Feng, Xiaogang; Chen, Yuan; Cao, Xiufeng; Li, Jin‐Heng

doi:10.1016/j.molcata.2004.01.001

Cited by 32 publications

(18 citation statements)

References 36 publications

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“…Attack of the hydroxy radical at C-5 in I-1 with subsequent rearrangement, could cause C-5-N-4 bond cleavage leading to formic acid amide (7), carbonic acid amide (8) and nitrate. Further transformation of amides gave the corresponding acids, ammonia and aniline (9). None of phenyl semicarbazide, phenyl hydrazine, phenol and urea was detected in this study.…”

Section: Proposed Photocatalytic Degradation Pathwayscontrasting

confidence: 48%

“…The technology is attractive as solar energy is an inexpensive, renewable energy source and is particularly relevant for agricultural countries like Thailand where it may be necessary to treat water in the absence of a reliable electricity source. Furthermore, it can lead to complete mineralization [7][8][9], thereby eliminating potential effects associated with toxic intermediates. Although there have been reports on degradation of pesticides [8][9][10][11][12][13] in polluted waters, the efficiency of the process is heavily dependent on the chemical nature of the pesticides being treated.…”

Section: Introductionmentioning

confidence: 99%

“…Furthermore, it can lead to complete mineralization [7][8][9], thereby eliminating potential effects associated with toxic intermediates. Although there have been reports on degradation of pesticides [8][9][10][11][12][13] in polluted waters, the efficiency of the process is heavily dependent on the chemical nature of the pesticides being treated. The present work aims to study the kinetics, to identify intermediates and to propose degradation mechanism of photocatalytic degradation of triazophos using simulated solar radiation.…”

Section: Introductionmentioning

confidence: 99%

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Photocatalytic degradation of triazophos in aqueous titanium dioxide suspension: Identification of intermediates and degradation pathways

Aungpradit

Sutthivaiyakit

Martens

et al. 2007

Journal of Hazardous Materials

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Section: Proposed Photocatalytic Degradation Pathwayscontrasting

confidence: 48%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Photocatalytic degradation of triazophos in aqueous titanium dioxide suspension: Identification of intermediates and degradation pathways

Aungpradit

Sutthivaiyakit

Martens

et al. 2007

Journal of Hazardous Materials

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“…[22][23][24] Seen from Table 1, C3 and C6 atoms have the largest frontier electron densities, 0.0821 and 0.0844, and the second largest densities of 0.0340 and 0.0328 are at the C1 and C4 atoms, respectively. Thus, it can be suggested that C3 and C6 atoms should be the first positions attacked by an OH radical, and that C1 and C4 atoms are also likely to be attacked.…”

Section: Frontier Electron Density and Bdementioning

confidence: 99%

OH-initiated AOPs degradation mechanism of ibuprofen in aqueous environments

et al. 2014

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As a common pharmaceutical and personal care product, ibuprofen (IBP) is regarded as an important pollutant in aqueous environments. In this paper, the OH-initiated advanced oxidation processes (AOPs) degradation mechanism and its subsequent reaction mechanism with IBP were studied at the M06-2x/6-311++G(2d, p)//M06-2x/6-31+G(d,p) level. The frontier electron density and bond dissociation energy were analyzed. In addition, profiles of the potential energy surface were constructed, and all the possible pathways were discussed. H-atom abstraction is the most important mechanism. The dominant products were IBAP, 2-[4-(1-hydroxyisobutyl)phenyl]propionic acid, and 1-(4-isobutylphenyl)-1-ethanol, which is in good agreement with the experimental results.

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“…The Langmuir-Hinshelwood (L-H) kinetic rate model has been widely applied to photocatalytic destruction of a wide series of compounds [24,25] . The L-H equation could provide reasonable simulations to the observed degradation kinetics.…”

Section: Kinetics Study On Photocatalytic Destruction Of Mc-lrmentioning

confidence: 99%

Photocatalytic degradation of trace-level of Microcystin-LR by nano-film of titanium dioxide

Feng

Fei

et al. 2006

CHINESE SCI BULL

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Microcystins, a group of hepatotoxin produced by cyanobacteria in eutrophic freshwater, have proven unreliable to be removed by conventional treatments. In this study, the photocatalytic degradation experiments of Microcystin-LR were conducted using nano-TiO 2 thin film, prepared by solgel and dip-coating method, with low UVA intensity irradiation. Analysis results from SPE (solid-phase extraction) combined with HPLC method showed that Microcystin-LR whose initial concentration (μg/L) around that occurs naturally was easily to be removed by photocatalytic system. The degradation efficiency of toxin was influenced by the pH conditions, initial concentration and UV intensity. The maximum initial rate of photocatalytic degradation occurred at pH 4 and over 95% of 20 μg/L Microcystin-LR was decomposed within 120 min under 400 μW/cm 2 UV illumination. The kinetic equations and parameters revealed that degradation reaction of trace level MC-LR, which was depicted by LangmuirHinshelwood kinetics model, was in accordance with pseudo first order kinetics process in appearance well. Under the condition of pH=6.7, irradiation intensity=400 μW/cm 2 and initial concentration=20 μg/L, the corresponding pseudo-first-order rate constant k and half-life were determined to be 0.0157 min −1 and 44 min, respectively. During the range of 200-1000 μW/cm 2 , the degradation rate increases with incident intensity to the 0.82 power and the corresponding apparent quantum yield (Φ app ) was found to be 5.19× 10 -8 g/J approximately.

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Photocatalytic degradation of pesticide pyridaben in suspension of TiO2: identification of intermediates and degradation pathways

Cited by 32 publications

References 36 publications

Photocatalytic degradation of triazophos in aqueous titanium dioxide suspension: Identification of intermediates and degradation pathways

Photocatalytic degradation of triazophos in aqueous titanium dioxide suspension: Identification of intermediates and degradation pathways

OH-initiated AOPs degradation mechanism of ibuprofen in aqueous environments

Photocatalytic degradation of trace-level of Microcystin-LR by nano-film of titanium dioxide

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