Photolysis of polycyclic aromatic hydrocarbons (PAHs) on Fe3+-montmorillonite surface under visible light: Degradation kinetics, mechanism, and toxicity assessments
| Autor: | Fu Wang, Hanzhong Jia, Gulimire Nulaji, Hongwei Gao, Song Zhao, Chuanyi Wang |
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| Rok vydání: | 2017 |
| Předmět: |
Anthracene
Environmental Engineering Health Toxicology and Mutagenesis Radical Photodissociation Kinetics Reactive intermediate Public Health Environmental and Occupational Health 02 engineering and technology General Medicine General Chemistry 010501 environmental sciences Phenanthrene 021001 nanoscience & nanotechnology Photochemistry 01 natural sciences Pollution chemistry.chemical_compound chemistry polycyclic compounds Environmental Chemistry Pyrene 0210 nano-technology Photodegradation 0105 earth and related environmental sciences |
| Zdroj: | Chemosphere. 184:1346-1354 |
| ISSN: | 0045-6535 |
| DOI: | 10.1016/j.chemosphere.2017.06.106 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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