Electron-accepting potential of solvents determines photolysis rates of polycyclic aromatic hydrocarbons: Experimental and density functional theory study

Shao, Junfeng; Chen, Jingwen; Xie, Qing; Wang, Ying; Li, Xuehua; Hao, Ce

doi:10.1016/j.jhazmat.2010.02.075

Cited by 17 publications

(12 citation statements)

References 37 publications

(47 reference statements)

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“…This trend was consistent with the previously reported effect of solvent polarity on PAH photodegradation [25,30,32]. There are three main initial pathways of PAH photodegradation: through radical cation (PAH + ), singlet oxygen ( 1 O 2 ) and hydroxyl radical (OH ) [37] as follows:…”

Section: Direct Photodegradation Of Pah and Phenolic Compoundssupporting

confidence: 91%

“…Fasnacht and Bolugh [29] found that quantum yields of some PAH photodegradation increased with increasing O 2 concentration. However, much higher photodegradation rate constants were observed in methanol than in hexane-even though O 2 usually has higher solubility in hexane than in methanol [30]. An earlier study observed minor or inconsistent effects of O 2 concentration upon the photodegradation of PAHs in dilute solutions [31].…”

Section: Introductionmentioning

confidence: 91%

“…The radical can be readily oxidized in aerated water to give hydroxyl-substituted PAH intermediates and quinones [26,38]. Both polarizability (p*) and electron-accepting (x) potential of the solvent molecules have been employed to interpret the photolysis rates of PAHs in the different solvents by Shao et al [30].…”

Section: Direct Photodegradation Of Pah and Phenolic Compoundsmentioning

confidence: 99%

“…An earlier study observed minor or inconsistent effects of O 2 concentration upon the photodegradation of PAHs in dilute solutions [31]. The electron-accepting potential of the solvent molecules has been proposed as the primary influence on the photodegradation rate constants of PAHs [30]. Librando et al [32] found that photodegradation rates in the polar media were faster than those in the nonpolar media and quantum yields were found to increase with increasing polarity of the medium.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Effect of phenolic compounds on photodegradation of anthracene and benzo[a]anthracene in media of different polarity

Schwab

Yang

et al. 2015

Journal of Photochemistry and Photobiology A: Chemistry

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Section: Direct Photodegradation Of Pah and Phenolic Compoundssupporting

confidence: 91%

Section: Introductionmentioning

confidence: 91%

Section: Direct Photodegradation Of Pah and Phenolic Compoundsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Effect of phenolic compounds on photodegradation of anthracene and benzo[a]anthracene in media of different polarity

Schwab

Yang

et al. 2015

Journal of Photochemistry and Photobiology A: Chemistry

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“…As a good hydroxyl radical scavenger, methanol could mask the possible photodegradation route induced by the hydroxyl radicals (Shao et al 2010;Calisto et al 2011).…”

Section: Resultsmentioning

confidence: 99%

Photochemical degradation of PAHs in estuarine surface water: effects of DOM, salinity, and suspended particulate matter

Shang

Chen

Shen

et al. 2015

Environ Sci Pollut Res

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The photodegradation of several polycyclic aromatic hydrocarbons (PAHs) including phenanthrene, benzo(a)pyrene, and benzo(e)pyrene was studied under different estuarine conditions to elucidate the effects of dissolved organic matter (DOM), salinity, and suspended particles on PAH photodegradation in the estuarine surface water. Besides the competitive light absorption effect, DOM can accelerate the photodegradation of small PAHs such as phenanthrene by enhancing the formation of reactive intermediates and inhibit the photodegradation of large PAHs such as benzo[a]pyrene (BaP) and benzo[e]pyrene (BeP) by binding the PAH molecules. High salinity would accelerate the photodegradation of PAHs; however, the magnitude and direction of the salt effect are complicated in the presence of DOM due to the "salting-out" effect on the binding of PAHs with DOM. Suspended particulate matter in the estuary provides an alternative solid-phase photodegradation pathway for PAHs, which proceeds faster than the aqueous phase. Particulates apparently exert different effects on the photodegradation of phenanthrene (Phe) and BaP as a result of the combined effects of light absorption, particulate organic matter, PAH surface sorption, and concentration dilution in the presence of suspended particulate matter.

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Photochemical behavior of fenpropathrin and λ-cyhalothrin in solution

Liu

et al. 2013

Environ Sci Pollut Res

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The photodegradation processes of fenpropathrin and λ-cyhalothrin were studied in hexane, methanol/water (1:1, v/v), and acetone in both ultraviolet light and simulated sunlight. Intermediates in the photodegradation process were identified using gas chromatography/mass spectrometry (GC/MS), and the analysis of intermediates was used to speculate on possible photodegradation pathways. The photodegradation processes of fenpropathrin and λ-cyhalothrin followed pseudo first-order kinetics. The photodegradation rates varied according to the solvent in decreasing order: hexane>methanol/water (1:1, v/v)>acetone. The effects of substances coexisting in the environment on the photodegradation of pyrethroids were also investigated in the research. Acetone, humic acid, and riboflavin increased photodegradation rates while L-ascorbic acid slowed the process. This study provides a theoretical basis for the removal of pyrethroid pollution from the natural environment.

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Electron-accepting potential of solvents determines photolysis rates of polycyclic aromatic hydrocarbons: Experimental and density functional theory study

Cited by 17 publications

References 37 publications

Effect of phenolic compounds on photodegradation of anthracene and benzo[a]anthracene in media of different polarity

Effect of phenolic compounds on photodegradation of anthracene and benzo[a]anthracene in media of different polarity

Photochemical degradation of PAHs in estuarine surface water: effects of DOM, salinity, and suspended particulate matter

Photochemical behavior of fenpropathrin and λ-cyhalothrin in solution

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