کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5747031 | 1618802 | 2017 | 9 صفحه PDF | دانلود رایگان |
- The aim was to characterize the ozone reaction with phenanthrene adsorbed in two types of soils.
- Physicochemical properties of soils affected ozone transfer and degradation of phenanthrene.
- Soil porosity and pore volume modifies contaminant adsorption and variation of crystal sizes.
- Ozonation is an attractive method to degrade phenanthrene in soil without (80%) and with OM (70%).
- The partial identification of intermediates and final accumulated products was developed.
The aim of this study was to characterize the ozone reaction with phenanthrene adsorbed in two types of soils (sand and agricultural). The effect of soil physicochemical properties (texture, bulk density, particle density, porosity, elemental composition, permeability, surface area and pore volume) on the phenanthrene decomposition was evaluated. Commercial sand has a uniform morphology (spherical) with a particle size range between 0.178 and 0.150Â mm in diameter, regular elemental composition SiO2, specific density of 1701.38Â kg/m3, a true density of 2492.50Â kg/m3, with an effective porosity of 31%. On the other hand, the agricultural soil had heterogeneous morphology, particle size between 0.1779 and 0.05Â mm in diameter, elemental composition was montmorrillonite silicon oxide, apparent density of 999.52Â kg/m3, a true density of 2673.55Â kg/m3, surface area of 34.92Â m2/g and porosity of 57%. The percentage of phenanthrene decomposition in the sand was 79% after 2Â h of treatment. On the other hand, the phenanthrene degradation in the agricultural soil was 95% during the same reaction time. The pore volume of soil limited the crystal size of phenanthrene and increased the contact surface with ozone confirming the direct impact of physicochemical properties of soils on the decomposition kinetics of phenanthrene. In the case of agricultural soil, the effect of organic matter on phenanthrene decomposition efficiency was also investigated. A faster decomposition of initial contaminant and byproducts formed in ozonation was obtained in natural agricultural soil compared to the sand. The partial identification of intermediates and final accumulated products produced by phenanthrene decomposition in ozonation was developed. Among others, phenanthroquinone, hydroquinone, phenanthrol, catechol as well as phthalic, diphenic, maleic and oxalic acids were identified.
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Journal: Chemosphere - Volume 169, February 2017, Pages 53-61