Olu-Owolabi B.I., Diagboya P.N., Adebowale K.O.
Evaluation of pyrene sorption-desorption on tropical soils
Journal of Environmental Management
Department of Chemistry, University of Ibadan, Ibadan, Nigeria; National Center for Nanoscience and Technology, Beijing 100190, China
Olu-Owolabi, B.I., Department of Chemistry, University of Ibadan, Ibadan, Nigeria; Diagboya, P.N., Department of Chemistry, University of Ibadan, Ibadan, Nigeria, National Center for Nanoscience and Technology, Beijing 100190, China; Adebowale, K.O., Department of Chemistry, University of Ibadan, Ibadan, Nigeria
Sorption-desorption processes control soil-pollutant interactions. These processes determine the extent of pyrene transport in soils. Understanding sorption characteristics of pyrene is necessary in ascertaining its fate in soil. Laboratory batch experiments were conducted to study the sorptions-desorption of pyrene on eight soils from varying tropical agro-ecological zones (AEZs). The results showed that pyrene sorptions equilibria were attained within 720min. Solution pH had a reciprocal effect on pyrene sorptions. Sorption was exothermic and increased with pyrene concentration in solution. The quantities of pyrene sorbed by each soil as well as the hysteresis were proportional to the percentage organic matter, and to some degree, the clay mineralogy. Sorption isotherms showed distributed reactivity involving several linear and non-linear isotherms. The present investigation showed that pyrene is likely to be more available to biota and reach the aquifer faster in low organic matter soils than those with relatively higher organic matter and more so in warmer climes. © 2014 Elsevier Ltd.
Agro-ecological zone; Pyrene; Sorption; Tropical soils
aluminum oxide; aluminum silicate; calcium carbonate; ferric hydroxide; ferric oxide; montmorillonite; organic matter; pyrene; soil organic matter; clay; pyrene; pyrene derivative; soil; soil pollutant; experimental study; organic matter; phase equilibrium; pollution control; pyrene; reaction kinetics; soil pollution; sorption; tropical soil; adsorption; article; controlled study; desorption; diffusion; isotherm; mineralogy; particle size; physical chemistry; physical phenomena; soil; soil acidity; soil property; sorption; surface soil; thermodynamics; chemical model; chemistry; kinetics; Nigeria; soil; soil pollutant; tropic climate; Adsorption; Aluminum Silicates; Kinetics; Models, Chemical; Nigeria; Pyrenes; Soil; Soil Pollutants; Thermodynamics; Tropical Climate