Rodriguez J, García A, Poznyak T, Chairez I
Superior School of Chemical Engineering, Instituto Politécnico Nacional (ESIQIE-IPN), México, D. F, Mexico.
Tecnológico de Estudios Superiores de Monterrey, Campus Guadalajara, Guadalajara, Jalisco, Mexico.
Chemosphere. 2017 Feb;169:53-61. doi: 10.1016/j.chemosphere.2016.10.141. Epub 2016 Nov 14.
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 0.150 mm in diameter, regular elemental composition SiO, specific density of 1701.38 kg/m, a true density of 2492.50 kg/m, with an effective porosity of 31%. On the other hand, the agricultural soil had heterogeneous morphology, particle size between 0.1779 and 0.05 mm in diameter, elemental composition was montmorrillonite silicon oxide, apparent density of 999.52 kg/m, a true density of 2673.55 kg/m, surface area of 34.92 m/g and porosity of 57%. The percentage of phenanthrene decomposition in the sand was 79% after 2 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.
本研究的目的是表征臭氧与吸附在两种类型土壤（沙子和农业土壤）中的菲的反应。评估了土壤理化性质（质地、容重、颗粒密度、孔隙率、元素组成、渗透率、表面积和孔隙体积）对菲分解的影响。商业沙子具有均匀的形态（球形），粒径范围在直径0.178至0.150毫米之间，元素组成规则为SiO，比重为1701.38千克/立方米，真密度为2492.50千克/立方米，有效孔隙率为31%。另一方面，农业土壤形态不均匀，粒径在直径0.1779至0.05毫米之间，元素组成为蒙脱石氧化硅，表观密度为999.52千克/立方米，真密度为2673.55千克/立方米，表面积为34.92平方米/克，孔隙率为57%。处理2小时后，沙子中菲的分解率为79%。另一方面，在相同反应时间内，农业土壤中菲的降解率为95%。土壤的孔隙体积限制了菲的晶体大小，并增加了与臭氧的接触面积，证实了土壤理化性质对菲分解动力学的直接影响。在农业土壤的情况下，还研究了有机质对菲分解效率的影响。与沙子相比，在天然农业土壤中，臭氧氧化过程中初始污染物和副产物的分解更快。对菲在臭氧氧化过程中分解产生的中间体和最终积累产物进行了部分鉴定。其中，鉴定出了菲醌、对苯二酚、菲酚、儿茶酚以及邻苯二甲酸、联苯二酸、马来酸和草酸。
