Sabah E, Celik M S
Mineral Processing Program, Kocatepe University, Afyon, 03000, Turkey.
J Colloid Interface Sci. 2002 Jul 1;251(1):33-8. doi: 10.1006/jcis.2002.8394.
In this study, the adsorption behavior of pyridine derivatives, i.e., 2-aminopyridine and 2,2'-bipyridyl, onto sepiolite, a natural clay mineral, has been investigated by bottle adsorption and IR spectroscopic techniques. The results indicate that 2-aminopyridine and 2,2'-bipyridyl molecules adsorb onto sepiolite through hydrogen bonding of the amino groups to the water molecules in the octahedral sheet and to the surface hydroxyls (Si-OH) in the tetrahedral sheet. These findings reveal that pyridine molecules not only adsorb onto the external surface of sepiolite but are also incorporated in its channels and tunnels with adsorption taking place at corners and/or edges, depending on the position of water molecules. A structural model is proposed to account for the orientation of pyridine derivatives in the sepiolite matrix.
在本研究中，通过瓶内吸附和红外光谱技术研究了吡啶衍生物（即2-氨基吡啶和2,2'-联吡啶）在天然粘土矿物海泡石上的吸附行为。结果表明，2-氨基吡啶和2,2'-联吡啶分子通过氨基与八面体片中的水分子以及四面体片中的表面羟基（Si-OH）形成氢键吸附在海泡石上。这些发现表明，吡啶分子不仅吸附在海泡石的外表面，而且还根据水分子的位置，在其通道和隧道的角落和/或边缘发生吸附而被纳入其中。提出了一个结构模型来解释吡啶衍生物在海泡石基质中的取向。
