TY - JOUR
T1 - Adsorption behavior and mechanism of chloramphenicols, sulfonamides, and non-antibiotic pharmaceuticals on multi-walled carbon nanotubes
AU - Zhao, Heng
AU - Liu, Xue
AU - Cao, Zhen
AU - Zhan, Yi
AU - Shi, Xiaodong
AU - Yang, Yi
AU - Zhou, Junliang
AU - Xu, Jiang
N1 - Publisher Copyright:
© 2016 Elsevier B.V.
PY - 2016/6/5
Y1 - 2016/6/5
N2 - The adsorption behavior of different emerging contaminants (3 chloramphenicols, 7 sulfonamides, and 3 non-antibiotic pharmaceuticals) on five types of multi-walled carbon nanotubes (MWCNTs), and the underlying factors were studied. Adsorption equilibriums were reached within 12 h for all compounds, and well fitted by the Freundlich isotherm model. The adsorption affinity of pharmaceuticals was positively related to the specific surface area of MWCNTs. The solution pH was an important parameter of pharmaceutical adsorption on MWCNTs, due to its impacts on the chemical speciation of pharmaceuticals and the surface electrical property of MWCNTs. The adsorption of ionizable pharmaceuticals decreased in varying degrees with the increased ionic strength. MWCNT-10 was found to be the strongest adsorbent in this study, and the Freundlich constant (KF) values were 353–2814 mmol1−n Ln/kg, 571–618 mmol1−n Ln/kg, and 317–1522 mmol1−n Ln/kg for sulfonamides, chloramphenicols, and non-antibiotic pharmaceuticals, respectively. The different adsorption affinity of sulfonamides might contribute to the different hydrophobic of heterocyclic substituents, while chloramphenicols adsorption was affected by the charge distribution in aromatic rings via substituent effects.
AB - The adsorption behavior of different emerging contaminants (3 chloramphenicols, 7 sulfonamides, and 3 non-antibiotic pharmaceuticals) on five types of multi-walled carbon nanotubes (MWCNTs), and the underlying factors were studied. Adsorption equilibriums were reached within 12 h for all compounds, and well fitted by the Freundlich isotherm model. The adsorption affinity of pharmaceuticals was positively related to the specific surface area of MWCNTs. The solution pH was an important parameter of pharmaceutical adsorption on MWCNTs, due to its impacts on the chemical speciation of pharmaceuticals and the surface electrical property of MWCNTs. The adsorption of ionizable pharmaceuticals decreased in varying degrees with the increased ionic strength. MWCNT-10 was found to be the strongest adsorbent in this study, and the Freundlich constant (KF) values were 353–2814 mmol1−n Ln/kg, 571–618 mmol1−n Ln/kg, and 317–1522 mmol1−n Ln/kg for sulfonamides, chloramphenicols, and non-antibiotic pharmaceuticals, respectively. The different adsorption affinity of sulfonamides might contribute to the different hydrophobic of heterocyclic substituents, while chloramphenicols adsorption was affected by the charge distribution in aromatic rings via substituent effects.
KW - Adsorption
KW - Carbon nanotubes
KW - Emerging pharmaceuticals
KW - Isotherm
KW - Mechanism
UR - https://www.scopus.com/pages/publications/84978514864
U2 - 10.1016/j.jhazmat.2016.02.045
DO - 10.1016/j.jhazmat.2016.02.045
M3 - 文章
C2 - 26937870
AN - SCOPUS:84978514864
SN - 0304-3894
VL - 310
SP - 235
EP - 245
JO - Journal of Hazardous Materials
JF - Journal of Hazardous Materials
ER -