Desorption of polycyclic aromatic hydrocarbons from aged and unaged charcoals with and without modification of humic acids

作者：Zhou, Zunlong; Sun, Hongwen^*; Zhang, Wen

来源：Environmental Pollution, 2010, 158(5): 1916-1921.

DOI：10.1016/j.envpol.2009.10.035

• Desorption
• Charcoal
• PAHs
• Aging

Desorption of pyrene and phenanthrene, from two charcoals and humic acid preloaded charcoals were studied. Desorption occurred obviously in two fractions, with rapid and slow desorption rate constant ranging from 0.18 to 0.71 d(-1), and from 63 x 10(-5) to 7.4 x 10(-3) d(-1), respectively. Both the kinetics and percentage extent of desorption were influenced greatly by the properties of chemical and charcoal. Generally, slower and less desorption is related to larger chemical at lower level, and occurred from charcoal with greater aromaticity and polarity. Both rapid and slow desorption rates of pyrene decreased after the two charcoals were preloaded with humic acids. This demonstrates that the size and surface property of charcoal micropores exhibit great influence on the combination state of sorbed chemicals. Aging caused a greater reduction in desorption of phenanthrene compared to pyrene, which supports the mechanism of the transferring of chemical molecules from fast-desorbing sites to slowly-desorbing sites during aging.

• 出版日期2010-5
• 单位浙江工业大学; 南开大学