Empa - Swiss Federal Laboratories for Materials Science and Technology, CH-9014 St. Gallen, Switzerland; Agroscope, Institute for Sustainability Sciences ISS, CH-8046 Zurich, Switzerland.
Agroscope, Institute for Sustainability Sciences ISS, CH-8046 Zurich, Switzerland.
Environ Pollut. 2014 Sep;192:147-53. doi: 10.1016/j.envpol.2014.05.018. Epub 2014 Jun 18.
Carbon nanotubes (CNT) are strong sorbents for organic micropollutants, but changing environmental conditions may alter the distribution and bioavailability of the sorbed substances. Therefore, we investigated the effect of green algae (Chlorella vulgaris) on sorption of a model pollutant (diuron, synonyms: 3-(3,4-Dichlorophenyl)-1,1-dimethylurea, DCMU) to CNT (multi-walled purified, industrial grade, pristine, and oxidized; reference material: Diesel soot). In absence of algae, diuron sorption to CNT was fast, strong, and nonlinear (Freundlich coefficients: 10(5.79)-10(6.24) μg/kgCNT·(μg/L)(-n) and 0.62-0.70 for KF and n, respectively). Adding algae to equilibrated diuron-CNT mixtures led to 15-20% (median) diuron re-dissolution. The relatively high amorphous carbon content slowed down ad-/desorption to/from the high energy sorption sites for both industrial grade CNT and soot. The results suggest that diuron binds readily, but - particularly in presence of algae - partially reversibly to CNT, which is of relevance for environmental exposure and risk assessment.
碳纳米管 (CNT) 是有机微量污染物的强吸附剂，但环境条件的变化可能会改变吸附物质的分布和生物利用度。因此，我们研究了绿藻 (Chlorella vulgaris) 对模型污染物 (敌草隆，同义词：3-(3,4-二氯苯基)-1,1-二甲基脲，DCMU) 吸附到 CNT (多壁纯化、工业级、原始和氧化；参考物质：柴油烟尘) 的影响。在没有藻类的情况下，敌草隆对 CNT 的吸附速度快、强度高且呈非线性 (Freundlich 系数：10(5.79)-10(6.24) μg/kgCNT·(μg/L)(-n) 和 0.62-0.70 用于 KF 和 n)。将藻类添加到平衡的敌草隆-CNT 混合物中会导致 15-20%（中位数）的敌草隆重新溶解。相对较高的无定形碳含量减缓了工业级 CNT 和烟尘的高能吸附位的吸附/解吸速度。结果表明，敌草隆易于与 CNT 结合，但 - 特别是在藻类存在的情况下 - 部分可逆地与 CNT 结合，这对于环境暴露和风险评估具有重要意义。
