• Sorption and Desorption Kinetics of Naphthalene and Phenanthrene on Black Carbon in Sediment
  • Oh, Sang-Hwa;Wu, Qi;Song, Dong-Ik;Shin, Won-Sik;
  • Department of Environmental Engineering, Kyungpook National University;Department of Environmental Engineering, Kyungpook National University;Department of Chemical Engineering, Kyungpook National University;Department of Environmental Engineering, Kyungpook National University;
  • 퇴적물내 Black Carbon에 대한 Naphthalene과 Phenanthrene의 수착 및 탈착동력학
  • 오상화;;송동익;신원식;
  • 경북대학교 환경공학과;경북대학교 환경공학과;경북대학교 화학공학과;경북대학교 환경공학과;
Abstract
Black carbon (BC), a kind of high surface area carbonaceous material (HSACM), was isolated from Andong lake sediment. Sorption and desorption kinetics of naphthalene (Naph) and phenanthrene (Phen) in organic carbon (OC) and BC in the Andong lake sediment were investigated. Several kinetic models such as one-site mass transfer model (OSMTM), two-compartment first-order kinetic model (TCFOKM), and a newly proposed modified two-compartment first-order kinetic model (MTCFOKM) were used to describe the sorption and desorption kinetics. The MTCFOKM was the best fitting model. The MTCFOKM for sorption kinetics showed that i) the sorbed amounts of PAHs onto BC were higher than those onto OC, consistent with BET surface area; ii) the equilibration time for sorption onto BC was longer than those onto OC due to smaller size of micropore ($11.67{\AA}$) of BC than OC ($38.18{\AA}$); iii) initial sorption velocity of BC was higher than OC; and iv) the slow sorption velocity in BC caused the later equilibrium time than OC even though the fast sorption velocity was early completed in both BC and OC. The MTCFOKM also described the desorption of PAHs from the OC and BC well. After desorption, the remaining fractions of PAHs in BC were higher than those in OC due to stronger PAHs-BC binding. The remaining fractions increased with aging for both BC and OC.

Keywords: Black carbon;Sorption/Desorption Kinetics;Naphthalene;Phenanthrene;Organic carbon;

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