Surface Chemistry of Mesoporous Materials: Effect of Nanopore Confinement

机译：介孔材料的表面化学：纳米孔限制的影响

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Acid-base titration and metal sorption experiments were performed on both mesoporous alumina and alumina particles under various ionic strengths. It has been demonstrated that surface chemistry and ion sorption within nanopores can be significantly modified by a nano-scale space confinement. As the pore size is reduced to a few nanometers, the difference between surface acidity constants (ΔpK = pK_2 ― pK_1) decreases, giving rise to a higher surface charge density on a nanopore surface than that on an unconfined solid-solution interface. The change in surface acidity constants results in a shift of ion sorption edges and enhances ion sorption on that nanopore surfaces.

机译：在各种离子强度下，对中孔氧化铝和氧化铝颗粒均进行了酸碱滴定和金属吸附实验。已经证明纳米孔内的表面化学和离子吸附可以通过纳米尺度的空间限制而显着地改变。随着孔径减小到几纳米，表面酸度常数之间的差异（ΔpK= pK_2 ― pK_1）减小，从而导致纳米孔表面的表面电荷密度高于无侧限固溶体界面的表面电荷密度。表面酸度常数的变化导致离子吸附边缘的偏移，并增强了该纳米孔表面上的离子吸附。

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来源
《Structure-Property Relationships of Oxide Surfaces and Interfaces II》|2002年|p.121-125|共5页
会议地点 Boston MA(US);Boston MA(US)
作者
Yifeng Wang; Charles Bryan; Huifang Xu; Huizhen Gao;
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作者单位

Sandia National Laboratories, Carlsbad, New Mexico 88220;

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原文格式 PDF
正文语种 eng
中图分类化学;
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Surface Chemistry of Mesoporous Materials: Effect of Nanopore Confinement

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