Adsorption of asphaltenes from toluene on typical soils of Lublin region

Abstract

Adsorption of asphaltenes on soils is one of the important problems, though largely underestimated, in environment protection of Lublin region. Asphaltene adsorption properties affect the way the contamination spreads in soil. Analysis of this phenomenon may help in localisation and elimination of oil spills. The asphaltenes studied were obtained from local drills (Ś widnik near Lublin, Poland). In our previous paper, we investigated adsorption of asphaltenes from toluene on rock components (quartz, dolomite, calcite, kaolin as well as pure iron and titanium oxides). In order to simulate the natural oil spill conditions, we used toluene as solvent and typical soils from Lublin region as adsorbents (black earth, peat soil, lessive soil, brown soil, sandy podsolised soil, pararendzina soil). Main physicochemical properties of these soils were reported. Moreover, basic adsorption properties (nitrogen adsorption, adsorption of surfactants from water solutions, acidity, etc.) of several soil fraction were studied. We decided to use only certain mineral fractions with highest adsorption capacity, as other fractions have limited impact on total adsorption. Adsorption on soil fraction gives also some insight into relative importance of various soil components on summary soil properties. The results of adsorption measurements are described in terms of physical adsorption on heterogeneous solids. # 2002 Published by Elsevier Science B.V.

Effect of surface acidity and basicity of aluminas on asphaltene adsorption and oxidation

“…Langmuir-type isotherms indicating that asphaltene molecules form monolayer coverage on the solid surface were observed in most solid surfaces [5,[24][25][26]. Multilayer adsorption isotherms have been reported as well [4,24,[27][28][29]. Multilayer behavior was attributed to the aggregate formation and precipitation of asphaltenes in the bulk due to asphaltene association and further formation of hemimicelles.…”

Asphaltene adsorption on quartz sand in the presence of pre-adsorbed water

“…Asphaltenes adsorb at solid surfaces [1], essentially to produce monolayers of nanoaggregates, the latter comprising stacks of 6 asphaltene molecules, according to the Yen-Mullins aggregation model [26]; further aggregation of nanoaggregates to form clusters at sufficiently high concentrations leads to thicker adsorbed layers [27,28]. According to Adams' comprehensive review on asphaltene adsorption, by assuming 3 nm asphaltene (nano)aggregates with a density of 1200 kg/m 3 , the maximum surface coverage for an asphaltene monolayer is calculated to be 3.6 mg/m 2 [1].…”

Adsorption-desorption of n–C7 asphaltenes over micro- and nanoparticles of silica and its impact on wettability alteration

“…Several experimental studies on asphaltene adsorption on solid surfaces have been reported in the literature (Adams, 2014;González and Moreira, 1991;Marczewski and Szymula, 2002;Marlow, Sresty, Hughes, & Mahajan, 1987;Pernyeszi and Dékány, 2001;Pernyeszi, Patzko, Berkesi, & Dékány, 1998Szymula and Marczewski, 2002) to understand the influence of the asphaltene chemical structure and composition (Dudášová, Flåten, Sjöblom, & Øye, 2009;Dudášová, Simon, Hemmingsen, & Sjöblom, 2008), the solvent or precipitant used (Dubey and Waxman, 1991;Nassar, 2010), the surface chemistry (Dudášová et al, 2009;Franco, Montoya, Nassar, Pereira-Almao, & Cortés, 2013b. Nassar, 2010Nassar, Hassan, & Pereira-Almao, 2011a.…”