Faculty of Environmental Science & Engineering, Kunming University of Science & Technology, Kunming 650093, China.
Environ Pollut. 2011 Oct;159(10):2616-21. doi: 10.1016/j.envpol.2011.05.036. Epub 2011 Jun 25.
The environmental risks of antibiotics have attracted lots of research attention, but their environmental behavior is not clear yet. Functionalized carbon nanotubes (CNTs) were used as model adsorbents and sulfamethoxazole (SMX) was used as a model antibiotic to investigate the effect of both cations (Ca(2+), Cs(+)) and anions (phosphate) on antibiotics adsorption. Various mechanisms (such as electrostatic interaction, hydrophobic interaction, π-π and hydrogen bonds) play roles in SMX adsorption. Cations and anions could "wedge into" these mechanisms and thus alter SMX adsorption. This study emphasized that both increased and decreased SMX adsorption could be observed with the addition of cations/anions, depending on environmental conditions (such as pH in this current study). The net effect is the balance between the increased and decreased effects. The contribution of different mechanisms to the overall antibiotic adsorption on solid particles should be identified to accurately predict the apparent effect by cations and anions.
抗生素的环境风险引起了广泛的研究关注，但它们的环境行为尚不清楚。本研究采用功能化碳纳米管（CNTs）作为模型吸附剂，以磺胺甲恶唑（SMX）作为模型抗生素，考察了阳离子（Ca(2+)、Cs(+)）和阴离子（磷酸盐）对抗生素吸附的影响。各种机制（如静电相互作用、疏水相互作用、π-π 相互作用和氢键）在 SMX 吸附中起作用。阳离子和阴离子可以“插入”这些机制，从而改变 SMX 的吸附。本研究强调，随着阳离子/阴离子的添加，SMX 的吸附可能会增加或减少，具体取决于环境条件（如本研究中的 pH 值）。净效应是增加和减少效应之间的平衡。为了准确预测阳离子和阴离子的表观效应，应确定不同机制对固体颗粒上抗生素总吸附的贡献。
