Department of Environmental Science, Zhejiang University, Hangzhou, Tianmushan Street 148, Zhejiang 310028, China.
Environ Pollut. 2011 Feb;159(2):550-6. doi: 10.1016/j.envpol.2010.10.010. Epub 2010 Nov 10.
A biomass-generated soot was sequentially treated by HCl-HF solution, organic solvent, and oxidative acid to remove ash, extractable native organic matter (EOM), and amorphous carbon. The compositional heterogeneity and nano-structure of the untreated and treated soot samples were characterized by elemental analysis, thermal gravimetric analysis, BET-N(2) surface area, and electron microscopic analysis. Sorption properties of polar and nonpolar organic pollutants onto the soot samples were compared, and individual contributions of adsorption and absorption were quantified. The sorption isotherms for raw sample were practically linear, while were nonlinear for the pretreated-soot. The removal of EOM enhanced adsorption and reduced absorption, indicating that EOM served as a partitioning phase and simultaneously masked the adsorptive sites. By drastic-oxidation, the outer amorphous carbon and the inner disordered core of the soot particles were completely removed, and a fullerene-like nanoporous structure (aromatic shell) was created, which promoted additional π-π interaction between phenanthrene and the soot.
生物质生成的烟尘依次用 HCl-HF 溶液、有机溶剂和氧化酸处理，以去除灰分、可提取天然有机质（EOM）和无定形碳。采用元素分析、热重分析、BET-N2表面积和电子显微镜分析对未处理和处理后的烟尘样品的组成异质性和纳米结构进行了表征。比较了极性和非极性有机污染物在烟尘样品上的吸附性能，并量化了吸附和吸收的单独贡献。原始样品的吸附等温线实际上是线性的，而预处理烟尘的吸附等温线是非线性的。EOM 的去除增强了吸附，减少了吸收，表明 EOM 作为分配相同时掩盖了吸附位。通过剧烈氧化，烟尘颗粒的外层无定形碳和内层无序核被完全去除，形成了类富勒烯的纳米多孔结构（芳香壳），促进了菲与烟尘之间的额外 π-π 相互作用。
