title: Removal of polycyclic aromatic hydrocarbons (PAHs) from inorganic clay mineral: Bentonite.
abstract: There has been limited study of the removal of polycyclic aromatic hydrocarbons (PAHs) from inorganic clay minerals. Determining the amount of PAH removal is important in predicting their environmental fate. This study was carried out to the degradation and evaporation of PAHs from bentonite, which is an inorganic clay mineral. UV apparatus was designed specifically for the experiments. The impacts of temperature, UV, titanium dioxide (TiO2), and diethylamine (DEA) on PAH removal were determined. After 24 h, 75 and 44 % of ∑12 PAH in the bentonite were removed with and without UV rays, respectively. DEA was more effective as a photocatalyst than TiO2 during UV application. The ∑12 PAH removal ratio reached 88 % with the addition of DEA to the bentonite. It was concluded that PAHs were photodegraded at high ratios when the bentonite samples were exposed to UV radiation in the presence of a photocatalyst. At the end of all the PAH removal applications, higher evaporation ratios were obtained for 3-ring compounds than for heavier ones. More than 60 % of the amount of ∑12 PAH evaporated consisted of 3-ring compounds.
authors.affiliation: Department of Environmental Engineering, Faculty of Engineering, Uludag University, 16059, Nilüfer, Bursa, Turkey. geker@uludag.edu.tr.
authors.forename: Gizem
authors.initials: G
authors.lastname: Karaca
authors.affiliation: Department of Environmental Engineering, Faculty of Engineering, Uludag University, 16059, Nilüfer, Bursa, Turkey. baskaya@uludag.edu.tr.
authors.forename: Hüseyin S
authors.initials: HS
authors.lastname: Baskaya
authors.affiliation: Department of Environmental Engineering, Faculty of Engineering, Uludag University, 16059, Nilüfer, Bursa, Turkey. tasdemir@uludag.edu.tr.
authors.forename: Yücel
authors.initials: Y
authors.lastname: Tasdemir
mesh_terms: D000538:Aluminum Silicates / Q000737:chemistry; D001546:Bentonite / Q000737:chemistry*; D000077215:Clay; D010782:Photolysis; D011084:Polycyclic Aromatic Hydrocarbons / Q000302:isolation & purification*; D013696:Temperature; D014025:Titanium; D014466:Ultraviolet Rays
chemical_list: D000538:Aluminum Silicates; D011084:Polycyclic Aromatic Hydrocarbons; D001546:Bentonite; C009495:titanium dioxide; D014025:Titanium; D000077215:Clay
keywords: Diethylamine; Evaporation; Photodegradation; TiO2; UV