Use of different kinds of persulfate activation with iron for the remediation of a PAH-contaminated soil
Autor: | Fernando Pardo, Marina C. Peluffo, Aurora Santos, Arturo Romero |
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Jazyk: | angličtina |
Rok vydání: | 2016 |
Předmět: |
Environmental Engineering
02 engineering and technology 010501 environmental sciences 01 natural sciences Ferrous chemistry.chemical_compound medicine Environmental Chemistry Organic chemistry SOIL REMEDIATION Sodium dodecyl sulfate Waste Management and Disposal 0105 earth and related environmental sciences Anthracene Zerovalent iron ACTIVATED PERSULFATE Otras Ciencias Químicas ZEROVALENT IRON NANOPARTICLES Ciencias Químicas Phenanthrene 021001 nanoscience & nanotechnology Persulfate Pollution SURFACTANT PAHS chemistry Ferric Pyrene 0210 nano-technology CIENCIAS NATURALES Y EXACTAS Nuclear chemistry medicine.drug |
Popis: | Contamination of soils by persistent pollutants is considered an important matter of increasing concern. In this work, activated persulfate (PS) was applied for the remediation of a soil contaminated with polycyclic aromatic hydrocarbons (PAHs), such as anthracene (ANT), phenanthrene (PHE), pyrene (PYR) and benzo[a]pyrene (BaP). PS activation was performed by different ways; where ferric, ferrous sulfate salts (1–5 mmol·L− 1) and nanoparticles of zerovalent iron (nZVI) were used as activators. Moreover, in order to improve the oxidation rate of contaminants in the aqueous phase, the addition of sodium dodecyl sulfate (SDS), as anionic surfactant, was tested. On the other hand, it was also studied the role of humic acids (HA), as reducing agent or surfactant, on PAHs conversion. Removal efficiencies near 100% were achieved for ANT and BaP in all the runs carried out. Nevertheless, remarkable differences on removal efficiencies were observed for the different techniques applied in case of PHE and PYR. In this sense, the highest conversions of PHE (80%) and PYR (near 100%) were achieved when nZVI was used as activator. Similar results were obtained when activation was carried out either with Fe2 + or Fe3 +. This can be explained by the presence of quinone type compounds, as 9,10-anthraquinone (ATQ), that can promote the reduction of Fe3 + into Fe2 +, permitting PS radicals to be generated. On the other hand, the addition of HA did not produce an improvement of the process while surfactant addition slightly increases the PAHs removal. Furthermore, a kinetic model was developed, describing the behavior of persulfate consumption, and contaminants removal under first order kinetics. Fil: Peluffo, Marina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas. Universidad Nacional de La Plata. Facultad de Ciencias Exactas. Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas; Argentina Fil: Pardo, F.. Universidad Complutense de Madrid; España Fil: Santos, A.. Universidad Complutense de Madrid; España Fil: Romero, A.. Universidad Complutense de Madrid; España |
Databáze: | OpenAIRE |
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