Adsorption of phenanthrene by stevensite and sepiolite

Abstract

Polycyclic aromatic hydrocarbons are increasingly widespread pollutants introduced into the environment via oil spillage and incomplete anthropogenic combustion of fossil fuels. In this work, the capacity of stevensite and sepiolite to adsorb phenanthrene (PHE) has been evaluated experimentally by batch testing. Both clay minerals are distributed widely in the Madrid Basin, are of low cost and can be applied with minimal environmental impact. In the context of few previous studies, adsorption isotherms have been developed to understand the adsorption mechanisms and were fitted to the Freundlich and linear models with virtually the same results. Although stevensite showed greater adsorption capacity than sepiolite, the isotherms were constructed for equilibrium concentrations up to 0.8–1.0 mg/L due to the low solubility of PHE in water. When compared to other adsorbents the ability of stevensite to retain PAHs should be examined further in order to add and complement novel functions in reactive barriers.

Comparative adsorption of tetracyclines on biochars and stevensite: Looking for the most effective adsorbent

“…(Spain) with the commercial name of Minclear N100. Table 2 summarizes the most important characteristics of stevensite (Mohd Amin et al, 2016;González-Santamaría et al, 2017). Two commercial biochars supplied by Piroeco Bioenergy SL (Spain) were tested.…”

Impact of a tire fire accident on soil pollution and the use of clay minerals as natural geo-indicators

“…The existence of noncharged interlaminar surface sites induce them to form hydrophobic bonds with organic pollutants. Much recent research has studied the capability of natural clay minerals to trap PAHs such as phenanthrene (Phe) and pyrene (Pyr), (e.g., González-Santamaría et al 2017;Cobas et al 2014).…”

Thermal degradation kinetics of sepiolite

“…The effects of heating, acid leaching and various chemical treatments on the crystal structure and properties of sepiolite have been discussed qualitatively (Serna et al , 1975; Yebra-Rodriquez et al , 2003; Yılmaz et al , 2013, Fitaroni et al , 2019). Sepiolite has been used widely in many processes, such as adsorption, catalysis, bleaching of edible oils, clarification of fruit juices, preparation of polymer nanocomposites and pharmaceutical applications (Galan, 1996; Murray, 1999; Saneeri et al , 2015, González-Santamaria, 2017; Mirzaaghaei et al , 2017; Al-Ani et al , 2018; Tian et al , 2019).…”