earticle

영어

A high performance porous biochar described as RH-NaOH was successfully synthesized by one step pyrolysis of rice husk with alkaline activation NaOH, and was employed to eliminate polycyclic aromatic hydrocarbons (PAHs) and phthalates (PAEs) from water and sediments. Benefiting from NaOH activation, the RH-NaOH possessed a porous structure and large specific surface area (750 m2/g). Except for Chrysene (Chry), Benzo(a)pyrene, and Benzo(g,h,i)perylene, the adsorption equilibrium was attained within 60 minutes for all target contaminated compounds. These slow adsorptions are attributed to the high hydrophobicity of heavier PAHs. Adsorption isotherms and kinetic models suggest the generation of an adsorbate multilayer adsorption. Different RH-NaOH dosages were amended to sediments to reduce the remain of PAHs and PAEs in sediment. At 2 wt% of RH-NaOH amended sediment, the total of PAHs and PAEs decreased by 30 % compared to the sediment without biochar.