Polycyclic aromatic hydrocarbons (PAils), a group of ubiquitous persistent toxic substances possessing carcinogenic, mutagenic and immunotoxic properties, have become an issue of increasing concern in recent decades. PAHs are mainly originated from incomplete combustion of fossil fuel and biomass. PAHs tend to be strongly adsorbed to soil and are difficult to dissipate owing to their high octonal-water partition coefficients. Due to its high storage capacity, soil is considered as a major environm...