Photolysis of polycyclic aromatic hydrocarbons (PAHs) on Fe3+-montmorillonite surface under visible light: Degradation kinetics, mechanism, and toxicity assessments
Zhao, S (Zhao, Song); Jia, HZ (Jia, Hanzhong); Nulaji, G (Nulaji, Gulimire); Gao, HW (Gao, Hongwei); Wang, F (Wang, Fu); Wang, CY (Wang, Chuanyi)
2017
Source PublicationCHEMOSPHERE
ISSN0045-6535
Volume184Issue:10Pages:1346-1354
Abstract

Photochemical behavior of various polycyclic aromatic hydrocarbons (PAHs) on Fe3+-modified montmorillonite was explored to determine their potential kinetics, pathways, and mechanism under visible light. Depending on the type of PAH molecules, the transformation rate follows the order of benzo[a] pyrene anthracene > benzo[a]anthracene > phenanthrene. Quantum simulation results confirm the crucial role of "cation-pi" interaction between Feat and PAHs on their transformation kinetics. Primary intermediates, including quinones, ring-opening products and benzene derivatives, were identified by gas chromatography-mass spectrometer (GC-MS), and the possible photodegradation pathway of benzo [a]pyrene was proposed. Meanwhile, radical intermediates, such as reactive oxygen species (ROS) and free organic radicals, were detected by electron paramagnetic resonance (EPR) technique. The photolysis of selected PAHs, such as anthracene and benzo[a]pyrene, on clay surface firstly occurs by electron transfer from PAHs to Fe3+-montmorillonite,followed by degradation involving photo-induced ROS such as center dot OH and center dot O-2(-). To investigate the acute toxicity of photolysis products, the Microtox (R) toxicity test was performed during the photodegradation processes of various PAHs. As a result, the photo-irradiation initially induces increased toxicity by generating reactive intermediates, such as free organic radicals, and then the toxicity gradually decreases with increasing of reaction time. Overall, the present study provides useful information to understand the fate and photo-transformation of PAHs in contaminated soils.

KeywordPolycyclic Aromatic Hydrocarbons (Pahs) Montmorillonite Cation-pi Interaction Free Radical Photolysis
DOI10.1016/j.chemosphere.2017.06.106
Indexed BySCI
WOS IDWOS:000407525500149
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Document Type期刊论文
Identifierhttp://ir.xjipc.cas.cn/handle/365002/5035
Collection中国科学院特殊环境功能材料与器件重点试验室
AffiliationChinese Acad Sci, Xinjiang Tech Inst Phys & Chem, Key Lab Funct Mat & Devices Special Environm, Urumqi 830011, Peoples R China
Recommended Citation
GB/T 7714
Zhao, S ,Jia, HZ ,Nulaji, G ,et al. Photolysis of polycyclic aromatic hydrocarbons (PAHs) on Fe3+-montmorillonite surface under visible light: Degradation kinetics, mechanism, and toxicity assessments[J]. CHEMOSPHERE,2017,184(10):1346-1354.
APA Zhao, S ,Jia, HZ ,Nulaji, G ,Gao, HW ,Wang, F ,&Wang, CY .(2017).Photolysis of polycyclic aromatic hydrocarbons (PAHs) on Fe3+-montmorillonite surface under visible light: Degradation kinetics, mechanism, and toxicity assessments.CHEMOSPHERE,184(10),1346-1354.
MLA Zhao, S ,et al."Photolysis of polycyclic aromatic hydrocarbons (PAHs) on Fe3+-montmorillonite surface under visible light: Degradation kinetics, mechanism, and toxicity assessments".CHEMOSPHERE 184.10(2017):1346-1354.
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