期刊
SCIENCE OF THE TOTAL ENVIRONMENT
卷 427, 期 -, 页码 247-252出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.scitotenv.2012.03.039
关键词
Cation-pi interaction; Cation bridging; Complexation; Heavy metals; Hydrogen bond
资金
- National Scientific Foundation of China [40973081, 40803034]
- Future Talents Program of Yunnan Province
- Scientific Research Foundation for the Returned Overseas Chinese Scholars (State Education Ministry)
- Recruitment Program of High-Qualified Scholars in Yunnan [2010CI109]
Because of their various functional groups, antibiotics may complex with heavy metals and thus the environmental behaviors of both antibiotics and heavy metals may be altered. Noticing the experimental flaws of the previous studies, this study used Cu2+ and sulfamethoxazole (SMX) as model sorbates and carbon nanotubes (CNTs) as model sorbents to investigate the coadsorption of Cu and SMX. Combining the results of binary interaction experiments, we concluded that Cu and SMX preferentially occupy different types of CNT sorption sites at pHs 1.0 and 3.5, showing no apparent sorption change with the presence of coadsorbates. However, at pH 6.5, ternary complexes of Cu-SMX-CNTs and SMX-Cu-CNTs may be formed depending on Cu2+ concentrations. XPS data provided further support for the adsorption of both Cu and SMX on CNTs. These results indicated that the environmental behavior of antibiotics should be evaluated with careful consideration of the rule of metal ions. (C) 2012 Elsevier B.V. All rights reserved.
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