Journal
ENVIRONMENTAL POLLUTION
Volume 159, Issue 10, Pages 2616-2621Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.envpol.2011.05.036
Keywords
Calcium; Cesium; Electrostatic interaction; Hydrophobic effect; Phosphate
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Funding
- National Scientific Foundation of China [50878101, 40973081, 40803034]
- Scientific Research Foundation for the Returned Overseas Chinese Scholars (State Education Ministry)
- Research Grant for Future Talents of Yunnan Province
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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 (Ca2+, Cs+) and anions (phosphate) on antibiotics adsorption. Various mechanisms (such as electrostatic interaction, hydrophobic interaction, pi-pi 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. (C) 2011 Elsevier Ltd. All rights reserved.
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