MOE Key Laboratory of Pollution Processes and Environmental Criteria, College of Environmental Science and Engineering, Nankai University, Tianjin 300071, PR China.
Environ Pollut. 2010 May;158(5):1916-21. doi: 10.1016/j.envpol.2009.10.035. Epub 2009 Nov 26.
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 6.3 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.
研究了两种活性炭和负载腐殖酸的活性炭中芘和菲的解吸情况。解吸明显发生在两个分数中，快速和慢速解吸速率常数分别在 0.18 到 0.71 d（-1）和 6.3×10（-5）到 7.4×10（-3）d（-1）范围内。动力学和解吸的百分比程度都受到化学物质和活性炭性质的很大影响。一般来说，较慢和较少的解吸与较低水平的较大化学物质有关，并且发生在芳香度和极性较大的活性炭上。两种活性炭负载腐殖酸后，芘的快速和慢速解吸速率均降低。这表明活性炭微孔的大小和表面性质对吸附化学物质的结合状态有很大影响。老化导致菲的解吸比芘的解吸减少得更多，这支持了在老化过程中化学分子从快速解吸位点转移到慢速解吸位点的机制。
