Removal of polycyclic aromatic hydrocarbons (PAHs) from groundwater by heterogeneous photocatalysis under natural sunlight

Vela, Nuria; Martínez-Menchón, Marina; Navarro, Ginés; Pérez-Lucas, Gabriel; Navarro, Simón

doi:10.1016/j.jphotochem.2012.02.003

Cited by 95 publications

(42 citation statements)

References 34 publications

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“…It is clear from the graph (Fig 4) that the percentage degradation of all PAHs by ZnO with the addition of Na 2 S 2 O 8 is higher than the one for ZnO alone. These results agreed with and is supported by Vela et al [10], who reported that the addition of an electron acceptor, such as inorganic peroxide (S 2 O 8 2− ) to a semiconductor suspension usually enhances the photo degradation rate of organic pollutants, since these substances capture the photo generated electrons more efficiently than dissolved oxygen, leading to a reduction of the electron-hole recombination. Na 2 S 2 O 8 traps the photo generated electron and reduces the probability of recombination with the positive hole.…”

Section: B Photo Catalytic Degradation Of Pahssupporting

confidence: 87%

“…Although the results support the effectiveness of the process in the photo degradation of PAHs ,very few studies on the photo catalytic degradation of PAHs using ZnO as a catalyst have been published [10]. It can be seen from the results (Fig 4) that ZnO as a photo catalyst alone showed less degradation performance as compared to the case in which oxidants are added.…”

Section: B Photo Catalytic Degradation Of Pahsmentioning

confidence: 75%

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Synthesis and Characterization of ZnO Nanoparticle and Application in the Photodegradation of Organic Pollutants in Effluents from Coal Power Station

2016

International Conference on Advances in Science, Engineering, Technology and Natural Resources (ICASETNR-16) Nov. 24-25, 2016 P

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Abstract-Water is an important part of biological life and can be contaminated with organic pollutants in effluent from refineries and coal power stations. The Polycyclic aromatic hydrocarbons (PAH|'s) are the organic contaminants of interest in this study. These PAH's can be harmful to the aquatic environment as well as humans due to their toxicity, mutagenicity, carcinogenicity. Zinc oxide is a promising photo catalyst for photo catalytic degradation and the addition of oxidants were proposed to enhance the photo catalytic performance as well. In this study, ZnO was synthesized and then characterized by X-ray powder diffraction, Scanning electron microscopy and energy dispersive spectroscopy spectrum. The XRD of the sample revealed the presence of required phase. The presence of Zn and O in the EDS results also confirmed the purity of the prepared sample.The Zno is well crystallized and its diffraction peaks are in good agreement with the hexagonal wurtzite crystal phase of Zno. The photo catalytic degradation of the PAH's were done in a lightproof chamber with a 92, 4% stimulation of sunlight. The results revealed that the photo catalytic degradation of PAHS was most effective when using the catalyst (ZnO) in combination with oxidants than when using the catalyst alone.

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Section: B Photo Catalytic Degradation Of Pahssupporting

confidence: 87%

Section: B Photo Catalytic Degradation Of Pahsmentioning

confidence: 75%

Synthesis and Characterization of ZnO Nanoparticle and Application in the Photodegradation of Organic Pollutants in Effluents from Coal Power Station

2016

International Conference on Advances in Science, Engineering, Technology and Natural Resources (ICASETNR-16) Nov. 24-25, 2016 P

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“…One treatment employed H 2 O 2 and Na 2 S 2 O 8 which, either alone or in the presence of trace metals, will produce the reactive hydroxide and sulfate radical species (House 1962;Venny et al 2012). We also report here the results of exposure of biochar to sunlight alone (direct photooxidation of PAHs occurs in a laboratory setting (Sabate et al 2001)) and in combination with the photocatalyst ZnO and Na 2 S 2 O 8 (acting as an electron acceptor to enhance oxidizing agent production (Vela et al 2012)). Concentration changes of 18 PAHs (the 16 Environmental Protection Agency (EPA)-defined PAHs plus 1-and 2-methyl naphthalene) in the biochars were monitored.…”

Section: Introductionmentioning

confidence: 96%

The influence of sunlight and oxidative treatment on measured PAH concentrations in biochar

Khalid

Klarup

2015

Environ Sci Pollut Res

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The concentration changes of 18 different polycyclic aromatic hydrocarbons (PAHs) in two different biochars were assessed after (1) chemical oxidative treatment with a solution of H2O2 and Na2S2O8, (2) exposure to sunlight with intermittent wetting, and (3) exposure to sunlight with intermittent wetting after mixing in ZnO and Na2S2O8. Chemical oxidative treatment of biochars derived from gasified wood biochar and a gasified wood/Arundo donax mixture led to decreases in six-ring PAHs, but overall significant increases in measured PAH concentration sums for both biochars (from 225 ± 7 to 312 ± 18 μg g(-1) for wood-derived and 165 ± 3 to 244 ± 7 μg g(-1) for mixture-derived). Sunlight exposure of the mixture-derived biochar led to increases in some three- and four-ring PAHs, but overall decreases in summed PAH concentrations (165 ± 3 to 60 ± 1 μg g(-1) with wetting only and 165 ± 3 to 41 ± 4 μg g(-1) when Na2S2O8 and ZnO were included). The mass losses in the sunlight-exposed samples primarily were due to losses of low molar mass (two-ring) PAHs, though high molar mass (five- and six-ring) PAH concentrations also decreased. This result implies sun and rain exposure to biochar, prior to agricultural application, will help reduce potential PAH soil contamination from the biochar.

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“…Likewise, UV treatment did not show any significant reductions in the Flr concentration at any of the time intervals, except after 2 h, compared to that for the control (Figure 1b). Comparatively, the lesser PAH degradation under UV treatment could be attributed to the relatively short exposure time of 2 h. Generally, an exposure time of several days is required for effective Pyr photodegradation [30], which is the main limitation of photolysis. However, we obtained a higher percentage of PAH photodegradation than that in other studies [30,31], which may be due to the large soil particle size (1.5 mm) [31] and reduced soil thickness (1 mm) [32].…”

Section: Pah Degradationmentioning

confidence: 99%

Oxidative Photodegradation of Pyrene and Fluoranthene by Fe-Based and Zn-Based Fenton Reagents

et al. 2017

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Abstract:Increased industrialization has introduced a lot of hazardous materials into ecosystems. Polycyclic aromatic hydrocarbons (PAHs) are among the most toxic and persistent organic pollutants emanating from petrochemical industrial areas. Remediation of PAHs-contaminated soil has been a particularly big challenge. Photochemical oxidation-reduction processes have gained attention because of their high efficiency and robustness for PAH removal from contaminated soils. In this study, the efficacy of Fe-based and Zn-based Fenton reagents for remediating soil contaminated with pyrene (Pyr) and fluoranthene (Flr) is evaluated. UV treatment (2-h exposure) at 254 nm resulted in 21.6 and 28.5% degradations of Pyr and Flr, respectively. The Zn-based Fenton reagent performed better than the Fe-based reagent by degrading 99.9% of Pyr. The Fe-based Fenton reagent (under UV light) resulted in 97.1-99.7% and 95.1-98.9% Pyr and Flr degradations, respectively, in 0.5-2 h. Notably, the temperature increase during UV irradiation facilitated the enhanced degradation of Pyr and Flr, as observed from negative correlations (r = (−)0.902-0.961 and p = 0.039-0.098) between the temperature and PAH concentrations. The newly tested Zn-based Fenton reagent was equally effective as the Fe-based Fenton reagent in degrading Pyr and Flr in soil. Hence, it can be used as a new alternative reagent to remediate PAH-polluted soils.

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Removal of polycyclic aromatic hydrocarbons (PAHs) from groundwater by heterogeneous photocatalysis under natural sunlight

Cited by 95 publications

References 34 publications

Synthesis and Characterization of ZnO Nanoparticle and Application in the Photodegradation of Organic Pollutants in Effluents from Coal Power Station

Synthesis and Characterization of ZnO Nanoparticle and Application in the Photodegradation of Organic Pollutants in Effluents from Coal Power Station

The influence of sunlight and oxidative treatment on measured PAH concentrations in biochar

Oxidative Photodegradation of Pyrene and Fluoranthene by Fe-Based and Zn-Based Fenton Reagents

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