Enhanced adsorption of molecules on surfaces of nanocrystalline particles

被引:223
|
作者
Zhang, HZ
Penn, RL
Hamers, RJ
Banfield, JF
机构
[1] Univ Wisconsin, Dept Geol & Geophys, Madison, WI 53706 USA
[2] Univ Wisconsin, Dept Chem, Madison, WI 53706 USA
来源
JOURNAL OF PHYSICAL CHEMISTRY B | 1999年 / 103卷 / 22期
关键词
D O I
10.1021/jp984574q
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Quantitative measurements of adsorption from solution show up to a 70-fold increase in the adsorption coefficient when a variety of organic acids are adsorbed onto 6 nm compared to 16 nn nanocrystalline titania particles. A Langmuir adsorption model modified to include the dependence of interfacial tension (interfacial free energy) on particle size predicts an increase in the adsorption constant (K-ads) as the crystallite size decreases; in agreement with the experimental results. The increase in K-ads arises predominantly from the increased molar;surface free energy of the nanocrystalline particles. The rapid increase in adsorption as particle size decreases has important implications for understanding and modeling natural and experimental systems.
引用
收藏
页码:4656 / 4662
页数:7
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