State Key Laboratory of Water Environment Simulation, School of Environment, Beijing Normal University, Beijing 100875, China.
State Key Laboratory of Water Environment Simulation, School of Environment, Beijing Normal University, Beijing 100875, China.
Sci Total Environ. 2014 Mar 1;473-474:308-16. doi: 10.1016/j.scitotenv.2013.12.033. Epub 2013 Dec 27.
The spatial arrangement of biochar and the exact underlying interaction mechanisms of biochar and hydrophobic organic compounds both remain largely unknown. The sorption of dibutyl phthalate (DBP) and phenanthrene (PHE) to plant- and manure-derived biochars in both single- and bi-solute systems was investigated. The significant positive relation between surface polarity and ash content suggests that minerals benefit the external distribution of polar groups on particle surfaces. PHE and DBP sorption by the biochars was regulated by their surface polarity. The PHE generally displayed a pronounced enhancement of DBP sorption, likely resulting from the formation of biochar-PHE-DBP complexes, suggesting that DBP and PHE had different sorption sites on the biochars. The enhancement of Cd(2+) (a soft Lewis acid) on DBP sorption implied that π-π interactions should not dominate DBP sorption by biochars. The influence of Cd(2+) on PHE sorption by biochars would depend on the balance between suppressive sorption by Cd(2+)PHE bonding and enhanced sorption by Cd(2+)-complexed functionalities, and the amounts of Cd(2+) adsorbed by biochars determined the relative role of increased sorption by Cd(2+) in the overall PHE sorption.
生物炭的空间排列和生物炭与疏水性有机化合物的确切潜在相互作用机制在很大程度上仍然未知。研究了植物和粪便衍生的生物炭在单一和双溶质体系中对邻苯二甲酸二丁酯（DBP）和菲（PHE）的吸附。表面极性和灰分含量之间的显著正相关表明，矿物质有利于颗粒表面极性基团的外部分布。生物炭对 PHE 和 DBP 的吸附受其表面极性调节。PHE 通常显著增强 DBP 的吸附，可能是由于生物炭-PHE-DBP 复合物的形成，这表明 DBP 和 PHE 在生物炭上具有不同的吸附位点。Cd(2+)（软路易斯酸）对 DBP 吸附的增强意味着π-π相互作用不应主导生物炭对 DBP 的吸附。Cd(2+)对生物炭中 PHE 吸附的影响取决于 Cd(2+)PHE 键合抑制吸附和 Cd(2+)-络合官能团增强吸附之间的平衡，以及生物炭吸附的 Cd(2+)的量决定了 Cd(2+)增加吸附在总 PHE 吸附中的相对作用。
