Adsorption of ofloxacin and norfloxacin on carbon nanotubes: hydrophobicity- and structure-controlled process

Journal of Hazardous Materials
Hongbo PengBaoshan Xing

Abstract

Adsorption of antibiotics on solid particles is a key process controlling their fate in the subsurface. This study compared the adsorption of ofloxacin and norfloxacin (NOR) on carbon nanotubes (CNTs) to evaluate the role of structural and hydrophobic properties in regulating their adsorption. A significant relationship was observed between single-point adsorption coefficients (K(d)) and specific surface area (highly hydrophobic), but not between K(d)s and oxygen content. This result suggested that site-specific adsorption was not important but hydrophobic effect may have an important contribution to OFL and NOR adsorption on CNTs. However, normalizing the adsorption coefficients by OFL and NOR solubilities enlarged their adsorption difference indicating that hydrophobicity was not the only factor controlling the difference between OFL and NOR adsorption on CNTs. Their chemical structures show that both chemicals could interact with CNTs through an electron-donor-acceptor mechanism. This mechanism was correlated with the different adsorption of OFL and NOR on functionalized CNTs (namely hydroxylized, carboxylized, and graphitized CNTs). This study revealed that OFL and NOR adsorption was controlled by their both structural- and...Continue Reading

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Citations

Jan 15, 2013·Journal of Hazardous Materials·Sudipta RakshitRupali Datta
Mar 25, 2014·The Science of the Total Environment·Jin-Gang YuXiao-Qing Chen
Dec 3, 2014·Water Research·Onur Guven Apul, Tanju Karanfil
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Mar 20, 2021·The Science of the Total Environment·Huang ZhangDi Zhang
May 1, 2021·Molecules : a Journal of Synthetic Chemistry and Natural Product Chemistry·Marwa El-AzazyHagar Morsy
Apr 29, 2021·Environmental Science and Pollution Research International·Ankita OjhaPardeep Singh

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