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Sorption of aromatic hydrocarbons onto montmorillonite as affected by norfloxacin
- Source :
- Journal of Hazardous Materials. :137-144
- Publication Year :
- 2012
- Publisher :
- Elsevier BV, 2012.
-
Abstract
- Effect of norfloxacin (Nor) on the sorption of 1,3-dinitrobenzene (1,3-DNB), and PAHs (naphthalene (NAPH), phenanthrene (PHEN) and pyrene (PYR)) to K(+)-montmorillonite was studied. Nor suppressed 1,3-DNB sorption due to their competition for the same sorption sites. 1,3-DNB was sorbed on K(+)-montmorillonite surface via cation-polar interaction and n-π electron donor-acceptor interaction. Nor also was sorbed on these sites through cation exchange, cation bridging and/or surface complexation. Nor increased three PAHs sorption on montmorillonite and the enhanced magnitude was positively correlated with the π-donor strength of three PAHs. The enhanced sorption of PAHs by Nor was primarily attributed to π-π interaction between π-electron-depleted quinoline ring of Nor and π-electron-rich PAHs. Compared with cation (Nor(+)) and anion (Nor(-)), zwitterion (Nor(±)) of Nor increased PHEN and PYR sorption more pronounced due to additional cation-π interaction between the sorbed Nor(±) and PAHs. (1)H NMR spectrum provided direct evidence for π-π and cation-π complexation between PAHs and Nor(+) in solution by ring-current-induced upfield chemical shifts of amino group and methylene group of Nor(+).
- Subjects :
- Magnetic Resonance Spectroscopy
Environmental Engineering
Health, Toxicology and Mutagenesis
Inorganic chemistry
Quinoline
Sorption
Hydrogen-Ion Concentration
Phenanthrene
Pollution
Hydrocarbons
Anti-Bacterial Agents
chemistry.chemical_compound
Montmorillonite
Solubility
chemistry
Zwitterion
Spectroscopy, Fourier Transform Infrared
Bentonite
Environmental Chemistry
Pyrene
Adsorption
Methylene
Waste Management and Disposal
Norfloxacin
Naphthalene
Subjects
Details
- ISSN :
- 03043894
- Database :
- OpenAIRE
- Journal :
- Journal of Hazardous Materials
- Accession number :
- edsair.doi.dedup.....ea96f6c3949e02231bb10d96e44918c5