title: Adsorption of sulfamethoxazole on functionalized carbon nanotubes as affected by cations and anions.
abstract: 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.
authors.affiliation: Faculty of Environmental Science & Engineering, Kunming University of Science & Technology, Kunming 650093, China.
authors.forename: Di
authors.initials: D
authors.lastname: Zhang
authors.forename: Bo
authors.initials: B
authors.lastname: Pan
authors.forename: Min
authors.initials: M
authors.lastname: Wu
authors.forename: Bin
authors.initials: B
authors.lastname: Wang
authors.forename: Huang
authors.initials: H
authors.lastname: Zhang
authors.forename: Hongbo
authors.initials: H
authors.lastname: Peng
authors.forename: Di
authors.initials: D
authors.lastname: Wu
authors.forename: Ping
authors.initials: P
authors.lastname: Ning
mesh_terms: D000327:Adsorption; D000838:Anions / Q000737:chemistry; D002412:Cations / Q000737:chemistry; D004785:Environmental Pollutants / Q000737:chemistry*; D052918:Environmental Restoration and Remediation / Q000379:methods*; D037742:Nanotubes, Carbon / Q000737:chemistry*; D010710:Phosphates / Q000737:chemistry; D013420:Sulfamethoxazole / Q000737:chemistry*
chemical_list: D000838:Anions; D002412:Cations; D004785:Environmental Pollutants; D037742:Nanotubes, Carbon; D010710:Phosphates; D013420:Sulfamethoxazole