首页 | 本学科首页   官方微博 | 高级检索  
     


Predicting points of zero charge of oxides and hydroxides
Authors:Roe Hoan Yoon   Talat Salman  Gabrielle Donnay
Affiliation:1. Ore Processing Laboratory, Canada Center for Mineral and Energy Technology, Ottawa, Ontario, Canada;2. Department of Mining and Metallurgical Engineering McGill University, Montreal, Quebec H3A 2A7, Canada;3. Department of Geological Sciences, McGill University, Montreal, Quebec H3A 2A7, Canada
Abstract:Pauling's electrostatic valence principle has been applied to describe the surface-charging mechanism of oxides in an aqueous environment. This approach has led to the development of an equation with which one can predict the points of zero charge (PZC) of oxides and hydroxides from crystallographic data. The equation proposed in the present work is an improved version of Parks' PZC equation. The improvements are the following: (i) The equation does not incorporate correction terms to take the cation coordination numbers into account; (ii) the PZC of a complex oxide can be predicted directly from crystallographic data instead of from “assumed” PZCs of its component oxides; and (iii) one can use the mean metal-oxygen bond distance of a crystal instead of the ionic radii tabulated by Parks, which are not consistent with the up-to-date values.
Keywords:To whom correspondence should be addressed.
本文献已被 ScienceDirect 等数据库收录!
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号