首页|New insight into environmental photochemistry of PAHs induced by dissolved organic matters: A model of naphthalene in seawater

New insight into environmental photochemistry of PAHs induced by dissolved organic matters: A model of naphthalene in seawater

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  • NSTL
  • Elsevier
The photochemical behavior of a model PAH, naphthalene, was investigated under simulated sunlight ir-radiation with different dissolved organic matter (DOM) in seawater. The results revealed that naphthalene was prone to direct photolysis (Phi(d) = 1.34 x 10(-3)) and could be degraded by (DOM)-D-3*/O-1(2)-induced reactions with fulvic acid (FA) and humic acid (HA) at low concentrations. However, the DOM at a high level dramatically decreased the k(obs) due to the higher light attenuation and radical competition effect. The presence of FA resulted in lower (DOM)-D-3*/O-1(2) generation and quantum yield compared with HA, but it achieved higher degradation kinetics due to the higher reactivity between (3)FA* and naphthalene and their lower binding effect. The naphthalene degradation in natural water with different depths and DOM were modeled based on the experimental results, which revealed the important role of indirect photolysis initiated by inorganic constituents. Moreover, several degradation intermediates were identified by GC-MS and three possible pathways were proposed. The Quantitative Structure Activity Relationships (QSAR) evaluation revealed that some intermediates are more toxic than original naphthalene. This study offers further insights into the photochemical behavior of PAHs, which will facilitate our understanding of the persistence and ecological risks of organic contaminants in natural waters. (C) 2022 Institution of Chemical Engineers. Published by Elsevier Ltd. All rights reserved.

Polycyclic aromatic hydrocarbonsPhotochemical degradationReactive speciesModelingPOLYCYCLIC AROMATIC-HYDROCARBONSHUMIC SUBSTANCESPHOTOCATALYTIC DEGRADATIONSINGLET OXYGENQUANTUM YIELDSVISIBLE-LIGHTTRIPLET-STATECRUDE-OILWATERPHOTODEGRADATION

Fan, Jialu、Sun, Xianbo、Liu, Yongdi、Zhao, Dongye、Hao, Xiaodi、Liu, Wen、Cai, Zhengqing

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East China Univ Sci & Technol

Auburn Univ

Beijing Univ Civil Engn & Architecture

Peking Univ

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2022

10.1016/j.psep.2022.03.017

Transactions of The Institution of Chemical Engineers

Transactions of The Institution of Chemical Engineers

ISSN：0957-5820
年,卷(期)：2022.161
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