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Article

Humic Acid Extracts Leading to the Photochemical Bromination of Phenol in Aqueous Bromide Solutions: Influences of Aromatic Components, Polarity and Photochemical Activity

1
College of Environmental Science and Engineering, Dalian Maritime University, Dalian 116026, China
2
School of Science, Dalian Maritime University, Dalian 116026, China
*
Author to whom correspondence should be addressed.
Academic Editor: Vincenzo Piccialli
Molecules 2021, 26(3), 608; https://doi.org/10.3390/molecules26030608
Received: 28 December 2020 / Revised: 14 January 2021 / Accepted: 19 January 2021 / Published: 25 January 2021
Dissolved organic matter (DOM) is considered to play an important role in the abiotic transformation of organobromine compounds in marine environment, for it produces reactive intermediates photochemically and is recognized as a significant source of reactive halogen species in seawater. However, due to the complex composition of DOM, the relationship between the natural properties of DOM and its ability to produce organobromine compounds is less understood. Here, humic acid (HA) was extracted and fractionated based on the polarity and hydrophobicity using silica gel, and the influences of different fractions (FA, FB and FC) on the photochemical bromination of phenol was investigated. The structural properties of HA fractions were characterized by UV-vis absorption, Fourier transform infrared spectroscopy and fluorescence spectroscopy, and the photochemical reactivity of HA fractions was assessed by probing triplet dissolved organic matter (3DOM*), singlet oxygen (1O2) and hydroxyl radical (OH). The influences of HA fractions on the photo-bromination of phenol were investigated in aqueous bromide solutions under simulated solar light irradiation. FA and FB with more aromatic and polar contents enhanced the photo-bromination of phenol more than the weaker polar and aromatic FC. This could be attributed to the different composition and chemical properties of the three HAs’ fractions and their production ability of OH and 3DOM*. Separating and investigating the components with different chemical properties in DOM is of great significance for the assessment of their environmental impacts on the geochemical cycle of organic halogen. View Full-Text
Keywords: dissolved organic matter; fractionation; photochemical activity; bromination dissolved organic matter; fractionation; photochemical activity; bromination
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MDPI and ACS Style

Liu, H.; Pu, Y.; Qiu, X.; Li, Z.; Sun, B.; Zhu, X.; Liu, K. Humic Acid Extracts Leading to the Photochemical Bromination of Phenol in Aqueous Bromide Solutions: Influences of Aromatic Components, Polarity and Photochemical Activity. Molecules 2021, 26, 608. https://doi.org/10.3390/molecules26030608

AMA Style

Liu H, Pu Y, Qiu X, Li Z, Sun B, Zhu X, Liu K. Humic Acid Extracts Leading to the Photochemical Bromination of Phenol in Aqueous Bromide Solutions: Influences of Aromatic Components, Polarity and Photochemical Activity. Molecules. 2021; 26(3):608. https://doi.org/10.3390/molecules26030608

Chicago/Turabian Style

Liu, Hui, Yingying Pu, Xiaojun Qiu, Zhi Li, Bing Sun, Xiaomei Zhu, and Kaiying Liu. 2021. "Humic Acid Extracts Leading to the Photochemical Bromination of Phenol in Aqueous Bromide Solutions: Influences of Aromatic Components, Polarity and Photochemical Activity" Molecules 26, no. 3: 608. https://doi.org/10.3390/molecules26030608

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