Adsorption of Anthracene and Pyrene from Synthetic Ground Water by Diesel and Biomass Soots

Abstract

Polycyclic aromatic hydrocarbons (PAHs) are general toxic to aquatic organisms and many of themare carcinogenic and mutagenic to human. PAHs could be transferred from soil into groundwater throughaccumulation of PAHs in benthic organism. This study investigated the adsorption of 2 compounds of PAHsthat were anthracene (C14H10) and pyrene (C16H10) in synthetic groundwater on two types of soot, rubber-woodfurnaces soot (RB) and diesel engine soot (DE). The experiments were set up at room temperature of 28°C.Characteristics of the soot, such as carbon contents, specific surface area and pore volume wereinvestigated. Adsorption isotherms models, i.e., Freundlich (Fre) and Polanyi-Dubinin-Manes (PDM) were fitwell to the experimental data. KF in Fre and Vo in PDM illustrated adsorption degree of the soot in which KF ofanthracene on RB and on DE were 0.97 and 0.74 and VO of anthracene on RB and on DE were 200.30 and187.78 cm3 mol-1, respectively. On the other hand, KF of pyrene on RB and on DE were 0.97 and 0.74 and VOof pyrene on RB and on DE were 50.07 and 44.66 cm3 mol-1, respectively. Those results have shown that RBconducted adsorption capacities larger than DE, additionally the amount of adsorption of anthracene washigher than that of pyrene in despite of any kind of soot. The parameter E in PDM model was enthalpy orenergy of adsorption which is no significant change when the same PAH adsorbed onto the difference soot.These were verified by E of anthracene on RB and DE where values were -8.84 and -8.62 kJ mol-1 and those ofpyrene on RB and DE were -7.39 and -7.45 kJ mol-1, respectively.