Sorption of aromatic hydrocarbons onto montmorillonite as affected by norfloxacin

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• 作者：Zhiguo Pei^a ; ^{peizg@rcees.ac.cn} ; Jingjing Kong^b ; Xiao-quan Shan^a ; Bei Wen^a
• 关键词：Sorption ; Norfloxacin ; Aromatic hydrocarbons ; Montmorillonite ; 1H NMR
• 刊名：Journal of Hazardous Materials
• 出版年：2012
• 出版时间：15 February, 2012
• 年：2012
• 卷：203-204
• 期：Complete
• 页码：137-144
• 全文大小：510 K

文摘

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-¦Ð 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 ¦Ð-donor strength of three PAHs. The enhanced sorption of PAHs by Nor was primarily attributed to ¦Ð-¦Ð interaction between ¦Ð-electron-depleted quinoline ring of Nor and ¦Ð-electron-rich PAHs. Compared with cation (Nor⁺) and anion (Nor^{?/sup>), zwitterion (Nor¡À) of Nor increased PHEN and PYR sorption more pronounced due to additional cation-¦Ð interaction between the sorbed Nor¡À and PAHs. 1H NMR spectrum provided direct evidence for ¦Ð-¦Ð and cation-¦Ð complexation between PAHs and Nor+ in solution by ring-current-induced upfield chemical shifts of amino group and methylene group of Nor+.}