Sun Hongwen, Zhou Zunlong
Key Laboratory of Environmental Pollution Process and Standard (Nankai University), Ministry of Education, College of Environmental Science and Engineering, Nankai University, Tianjin 300071, China.
Chemosphere. 2008 May;71(11):2113-20. doi: 10.1016/j.chemosphere.2008.01.016. Epub 2008 Mar 10.
Sorption of three polycyclic aromatic hydrocarbons (PAHs, phenanthrene, anthracene and pyrene) on three charcoals and their precursor substance (sawdust) was studied. The charcoals obtained by heating at 400 degrees C for different periods were different in chemical composition and structure. Sorption characteristics were described by a Polanyi-Dubinin-Manes model combined with poly-parameter linear free energy relationships. The results revealed that though partition could not be neglected for sawdust and charcoal containing large sawdust residue, adsorption controlled the sorption of PAHs on matured charcoals, where pi-pi electron donor-acceptor (EDA) exerted as the main molecular-scale interactions. Charring elevated partition coefficients (K(oc)) of the three PAHs more than one order of magnitude, which ranged from 10(5.74) to 10(6.58) on charcoals (for PAHs at equilibrium concentration C(e)=0.005S(w)). Adsorption increased with the aromaticity of the charcoals, however, polar aromatic structure may stimulate sorption of PAHs due to the presence of pi-pi EDA interactions.
研究了三种多环芳烃（PAHs，菲、蒽和芘）在三种木炭及其前驱体物质（锯末）上的吸附情况。通过在400℃下加热不同时间获得的木炭在化学成分和结构上有所不同。吸附特性用Polanyi-Dubinin-Manes模型结合多参数线性自由能关系来描述。结果表明，虽然对于含有大量锯末残渣的锯末和木炭，分配作用不可忽视，但吸附作用控制了PAHs在成熟木炭上的吸附，其中π-π电子供体-受体（EDA）作用是主要的分子尺度相互作用。炭化使三种PAHs的分配系数（K(oc)）提高了一个多数量级，在木炭上其范围为10(5.74)至10(6.58)（对于平衡浓度C(e)=0.005S(w)时的PAHs）。吸附作用随木炭的芳香性增加而增强，然而，由于存在π-π EDA相互作用，极性芳香结构可能会促进PAHs的吸附。
