Photocatalytic degradation of polycyclic aromatic hydrocarbons on soil surfaces using TiO2 under UV light

Zhang, Lihong; Li, Peijun; Gong, Zongqiang; Li, Xuemei

doi:10.1016/j.jhazmat.2008.01.119

Cited by 225 publications

(103 citation statements)

References 39 publications

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“…Consequently, by adhesion to aggregating and settling TiO2NP, B(a)P could partly be removed from the water column and hence become less bioavailable. Furthermore, since TiO2NP can produce hydroxyl radicals in water and has been shown to enhance the degradation of several PAHs, including B(a)P, it is possible that TiO2NP caused an oxidative breakdown of B(a)P (Ireland et al, 1995;Zhang et al, 2008). However, it should be noted that a TiO2NP catalyzed degradation of B(a)P was not assessed in the present study, and further investigations on those processes are needed.…”

Section: Discussionmentioning

confidence: 86%

The impact of TiO2 nanoparticles on uptake and toxicity of benzo(a)pyrene in the blue mussel (Mytilus edulis)

Farkas

Bergum

Nilsen

et al. 2015

Science of The Total Environment

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Nanoparticles are emerging contaminants of concern. Knowledge on their environmental impacts is scarce, especially on their interactive effects with other contaminants. In this study we investigated effects of titanium dioxide nanoparticles (TiO2NP) on the blue mussel (Mytilus edulis) and determined their influence on the bioavailability and toxicity of benzo(a)pyrene (B(a)P), a carcinogenic polyaromatic hydrocarbon (PAH). Blue mussels were exposed to either TiO2NP (0.2 and 2.0 mg L -1 ) or B(a)P (20 µg L -1 ) and to the respective combinations of these two compounds. Aqueous contaminant concentrations, the uptake of Ti and B(a)P into mussel soft tissue, effects on oxidative stress and chromosomal damage were analyzed. The uncoated TiO2NP agglomerated rapidly in the seawater. The presence of TiO2NP significantly reduced the bioavailability of B(a)P, shown by lowered B(a)P concentrations in exposure tanks and in mussel tissue. The activities of antioxidant enzymes superoxide dismutase (SOD), catalase (CAT) and glutathione peroxidase (GPx) were impacted by the various exposures regimes, indicating oxidative stress in the contaminant exposure groups. While SOD activity was increased only in the 0.2TiO2NP exposure group, CAT activity was enhanced in both combined exposure groups.The GPx activity was increased only in the groups exposed to the two single compounds. In hemocytes, increased chromosomal damage was detected in mussels exposed to the single compounds, which was further increased after exposure to the combination of compounds. In this study we show that the presence of TiO2NP in the exposure system reduced B(a)P uptake in blue mussels. However, since most biomarker responses did not decrease despite lower B(a)P uptake in combined exposures, the results suggest that TiO2NP can act as additional stressor, or potentially alters B(a)P toxicity by activation.

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Section: Discussionmentioning

confidence: 86%

The impact of TiO2 nanoparticles on uptake and toxicity of benzo(a)pyrene in the blue mussel (Mytilus edulis)

Farkas

Bergum

Nilsen

et al. 2015

Science of The Total Environment

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“…Zhang et al [51]conducted a comprehensive study of the photocatalytic degradation of phenanthrene, pyrene and benzo(a)pyrene on soil surfaces using titanium dioxide (TiO2) under UV light. Compared to the absence of catalyst, the addition of TiO2 as catalyst revealed that TiO2 accelerated the photodegradation process of all three PAHs, with benzo(a)pyrene being degraded the fastest.…”

Section: Photocatalytic Degradationmentioning

confidence: 99%

Remediation of Contaminated Sites

Dadrasnia¹,

Shahsavari²,

Emenike³

2013

Hydrocarbon

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“…The US Environmental Protection Agency has signed PAHs as priority among pollutants because of their mutagenic and carcinogenic effects (3). Different remediation methods including solvent extraction, phytoremediation, chemical remediation, photo catalytic remediation, electrochemical remediation, thermal destruction and bioremediation, are investigated for remediation of soils contaminated with hydrocarbons (4)(5)(6)(7)(8)(9)(10)(11). Bioremediation has gained more attention among other methods because of less environmental hazards, as well as economic and practical aspects.…”

Section: Introductionmentioning

confidence: 99%

Bioremediation of Pyrene-Contaminated Soils Using Biosurfactant

Jorfi

Rezaee

Jaafarzadeh

et al. 2014

Jentashapir J Health Res

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Background: Polycyclic aromatic hydrocarbons (PAHs) are persistence organic chemicals with proved carcinogenic and mutagenic hazards. These compounds are usually adsorbed in soils in vicinity of oil and gas industries. Bioremediation of PAHs contaminated soils is difficult due to hydrophobic nature of PAHs. Objectives: The main purpose of the current study was to determine the pyrene removal efficiency in synthetically contaminated soil, using biosurfactant. Materials and Methods: Four pure bacterial strains capable of pyrene degradation were isolated from contaminated soils via enrichment techniques. The soil samples were spiked with an initial pyrene concentration of 500 mg/kg and subjected to bioremediation using a mixed culture comprised of previously isolated strains, in addition to application of biosurfactant during 63 days. Results: The pyrene removal efficiency in samples containing biosurfactant, without biosurfactant and controls, were 86.4%, 59.8% and 14%, respectively, after 63 days. The difference of pyrene removal efficiency between the biosurfactant-containing samples and the ones without it was significant (P < 0.05). Conclusions: Application of rhamnolipid biosurfactant produced by Pseudomonas aeruginosa significantly improved pyrene removal in contaminated soils.

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Photocatalytic degradation of polycyclic aromatic hydrocarbons on soil surfaces using TiO2 under UV light

Cited by 225 publications

References 39 publications

The impact of TiO2 nanoparticles on uptake and toxicity of benzo(a)pyrene in the blue mussel (Mytilus edulis)

The impact of TiO2 nanoparticles on uptake and toxicity of benzo(a)pyrene in the blue mussel (Mytilus edulis)

Remediation of Contaminated Sites

Bioremediation of Pyrene-Contaminated Soils Using Biosurfactant

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