Effects of dissolved organic matter on photochemicaltransformation of organic micropollutants in natural waters

Guo, Zhongyu; Chen, Jingwen; Zhang, Siyu; Chen, Xi; Wang, Jieqiong; Cui, Feifei

doi:10.1360/tb-2020-0791

Cited by 3 publications

(3 citation statements)

References 53 publications

(66 reference statements)

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“…FBA, HAP, DMBA, DMOP, and DMP were all able to promote the formation of 1 O 2 , which was inconsistent with the phenomenon observed for a steady-state concentration of 3 DOM*. The possible reason was that the 3 DOM* measured by TMP was the high-energy state 3 DOM* ( E > 2.7 eV), while 3 DOM* in the low-energy state ( E < 2.7 eV) can also generate 1 O 2 through energy transfer (the energy required is about 94 kJ/mol). , The results of the β-carotene probe experiment (Figure B) showed that the steady-state concentration of 1 O 2 in the hydrophobic region had little difference after the addition of different model compounds, but the average concentration (10 –12 mol/L) was more than 1 order of magnitude higher than that in the hydrophilic region (10 –14 to 10 –13 mol/L).…”

Section: Resultsmentioning

confidence: 66%

“…O 2 through energy transfer (the energy required is about 94 kJ/mol). 40,41 The results of the β-carotene probe experiment (Figure 5B) showed that the steady-state concentration of 1 O 2 in the hydrophobic region had little difference after the addition of different model compounds, but the average concentration (10 −12 mol/L) was more than 1 order of magnitude higher than that in the hydrophilic region (10 −14 to 10 −13 mol/L).…”

Section: Effect Of Different Dom Model Compounds Onmentioning

confidence: 99%

“…The experimental and calculated ultraviolet−visible absorption spectra of the model compounds and PCB-209 showed good consistency (Figure S2), indicating that the calculations of excited-state energy were reliable. Because 3 DOM* in the high energy state (E T1 > 2.7 eV) 40 could have a high redox capacity 41 and be quenched by TMP, the k TMP of DMBA, DMOP, and DMP were higher. The presence of HQ caused only a slight increase in k TMP , probably because, in the system containing HQ, the photoreaction generated some dark-colored products, which exerted a certain light-shielding effect.…”

Section: Effect Of Different Dom Model Compounds Onmentioning

confidence: 99%

See 2 more Smart Citations

Effect of Dissolved Organic Matter on the Photodegradation of Decachlorobiphenyl (PCB-209) in Heterogeneous Systems: Experimental Analysis and Excited-State Theory Calculations

Xu,

Wei,

Zhang

et al. 2024

Environ. Sci. Technol.

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Dissolved organic matter (DOM) can affect the transformation of pollutants through photosensitization, but most current research focuses on hydrophilic pollutants, making it such that less attention is paid to hydrophobic pollutants. In this paper, the effect and action mechanism of coexisting DOM on the photodegradation of decachlorobiphenyl (PCB-209) on suspended particles collected from the Yellow River were systematically investigated in a heterogeneous system using DOM standards and model compounds. Through molecular probe experiments, mass spectrometry analysis and theoretical calculations, we found that the excited triplet state of DOM ( 3 DOM*) could excite PCB-209 to undergo dechlorination reaction. Due to the different modes of electron transition, the presence of carbonyl groups decreased the energy of 3 DOM*, whereas the electron-donating groups made the energy of 3 DOM* higher. DOM containing phenolic hydroxyl groups led to a higher steady-state concentration of • OH, and DOM containing phenyl ketone structures had a stronger ability to produce • O 2 − . Compared with aqueous • OH, • O 2 − produced from hydrophobic microregions could react more readily with PCB-209. This study deepens the understanding of the role of different functional groups of DOM in the photosensitized transformation of hydrophobic compounds.

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Section: Resultsmentioning

confidence: 66%

Section: Effect Of Different Dom Model Compounds Onmentioning

confidence: 99%