Remediation and cytotoxicity study of polycyclic aromatic hydrocarbon-contaminated marine sediments using synthesized iron oxide–carbon composite

Remediation and cytotoxicity study of polycyclic aromatic hydrocarbon-contaminated marine... The study developed a new and cost-effective method for the remediation of marine sediments contaminated with polycyclic aromatic hydrocarbons (PAHs). Iron oxide (Fe3O4) nanoparticles were synthesized as the active component, supported on carbon black (CB), to form a composite catalyst (Fe3O4–CB) by using a wet chemical method. The oxidation of 16 PAH contaminants present in marine sediments significantly activated sodium persulfate (Na2S2O8) to form sulfate free radicals (SO4 −·); this was investigated in a slurry system. In addition, in vitro cytotoxic activity and oxidative stress studies were performed. The synthesized composite catalysts (Fe3O4–CB) were characterized using X-ray diffraction, Fourier transform infrared spectroscopy, a superconducting quantum interference device magnetometry, and environmental scanning electron microscopy. The efficiency of PAH removal was 39–63% for unactivated persulfate (PS) from an initial dose of 1.7 × 10−7–1.7 × 10−2 M. The removal of PAHs was evaluated using Fe3O4/PS, CB/PS, and Fe3O4/PS and found to be 75, 64, and 86%, respectively, at a temperature of 303 K, PS concentration of 1.7 × 10−5 M, and pH of 6.0. An MTT assay was used to assess the cytotoxicity of the composite catalyst at five concentrations (25, 50, 100, 200, and 400 μg/mL) on human hepatoma carcinoma (HepG2) cells for 24 h. This revealed a dose-dependent decrease in cell viability. A dichlorofluorescein diacetate assay was performed to evaluate the generation of reactive oxygen species, which principally originated from the ferrous ions of the composite catalyst. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Environmental Science and Pollution Research Springer Journals

Remediation and cytotoxicity study of polycyclic aromatic hydrocarbon-contaminated marine sediments using synthesized iron oxide–carbon composite

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Publisher
Springer Berlin Heidelberg
Copyright
Copyright © 2017 by Springer-Verlag Berlin Heidelberg
Subject
Environment; Environment, general; Environmental Chemistry; Ecotoxicology; Environmental Health; Atmospheric Protection/Air Quality Control/Air Pollution; Waste Water Technology / Water Pollution Control / Water Management / Aquatic Pollution
ISSN
0944-1344
eISSN
1614-7499
D.O.I.
10.1007/s11356-017-9354-1
Publisher site
See Article on Publisher Site

Abstract

The study developed a new and cost-effective method for the remediation of marine sediments contaminated with polycyclic aromatic hydrocarbons (PAHs). Iron oxide (Fe3O4) nanoparticles were synthesized as the active component, supported on carbon black (CB), to form a composite catalyst (Fe3O4–CB) by using a wet chemical method. The oxidation of 16 PAH contaminants present in marine sediments significantly activated sodium persulfate (Na2S2O8) to form sulfate free radicals (SO4 −·); this was investigated in a slurry system. In addition, in vitro cytotoxic activity and oxidative stress studies were performed. The synthesized composite catalysts (Fe3O4–CB) were characterized using X-ray diffraction, Fourier transform infrared spectroscopy, a superconducting quantum interference device magnetometry, and environmental scanning electron microscopy. The efficiency of PAH removal was 39–63% for unactivated persulfate (PS) from an initial dose of 1.7 × 10−7–1.7 × 10−2 M. The removal of PAHs was evaluated using Fe3O4/PS, CB/PS, and Fe3O4/PS and found to be 75, 64, and 86%, respectively, at a temperature of 303 K, PS concentration of 1.7 × 10−5 M, and pH of 6.0. An MTT assay was used to assess the cytotoxicity of the composite catalyst at five concentrations (25, 50, 100, 200, and 400 μg/mL) on human hepatoma carcinoma (HepG2) cells for 24 h. This revealed a dose-dependent decrease in cell viability. A dichlorofluorescein diacetate assay was performed to evaluate the generation of reactive oxygen species, which principally originated from the ferrous ions of the composite catalyst.

Journal

Environmental Science and Pollution ResearchSpringer Journals

Published: Jun 6, 2017

References

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