Spectroscopic study of sorption of nitrogen heterocyclic compounds on phyllosilicates

被引:26
作者
Chattopadhyay, S
Traina, SJ
机构
[1] Ohio State Univ, Sch Nat Resources, Columbus, OH 43210 USA
[2] Ohio State Univ, Environm Sci Grad Program, Columbus, OH 43210 USA
关键词
D O I
10.1021/la980607h
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
The present study focused on understanding the sorption characteristics of acridine (AcN) and acridine-9-carboxylic acid (AcNCOOH), two typical nitrogen heterocyclic compounds (NHCs), on well-characterized phyllosilicates (hectorite, saponite, and muscovite). Results presented in this article show that the degree of sorption of NHCs on phyllosilicates was dependent on the nature of the participating sorbates and sorbents. Sorption of the selected NHCs was pH-dependent, with maximum sorption occurring at low pH conditions, especially at pH < pK(a) of the NHC. Though sorption of the cationic forms of the NHCs on clays was preferred, neutral, zwitterionic, and anionic species of NHCs also sorbed on the clay surfaces. Spectroscopic studies have shown that sorbed NHC molecules formed clusters on clay surfaces, which acted as templates for molecular aggregation. Finally, we have also found that the day surfaces promoted protonation of neutral AcN molecules at low sorbate concentrations.
引用
收藏
页码:1634 / 1639
页数:6
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