Sulfate Adsorption onto and Desorption from Silicon Dioxide Films

被引：2
|
作者：
Wu, Bing [1 ]
Raghavan, Srini [1 ,2 ]
机构：
[1] Univ Arizona, Dept Chem & Environm Engn, Tucson, AZ 85721 USA
[2] Univ Arizona, Dept Mat Sci & Engn, Tucson, AZ 85721 USA
来源：
ECS JOURNAL OF SOLID STATE SCIENCE AND TECHNOLOGY | 2016年 / 5卷 / 05期
关键词：
PT(111) ELECTRODE; QUARTZ-CRYSTAL; FREQUENCY; ANIONS; MICROBALANCE; SURFACES; CONTACT; LIQUID; IONS;
D O I：
10.1149/2.0271605jss
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Sulfate ion adsorption onto and desorption from silicon dioxide surface has been investigated using a quartz crystal microbalance with dissipation monitoring capability (QCM-D). A viscoelastic model was used to calculate adsorption/desorption amount. Experimental results indicate that the adsorption from Na2SO4 and K2SO4 solutions at a pH of 6.8 results in the formation of a multilayer sulfate film with co-adsorption of Na+ or K+ ions. Sulfate ion uptake varied linearly with sulfate concentration in the range 0.01 M to 0.6 M. The first order rate constant for sulfate desorption with DI water is approximately 0.04 s(-1) and 0.12 s(-1) for flow rates of 0.2 ml/min and 1.0 ml/min, respectively. (C) 2016 The Electrochemical Society. All rights reserved.
引用
收藏
页码：N22 / N26
页数：5
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