Effect of Amines on the Surface Charge Properties of Iron Oxides

被引：5

作者：

Benezeth, Pascale ^{[1
,2
,3
]}

Wesolowski, David J. ^{[4
]}

Palmer, Donald A. ^{[5
]}

Machesky, Michael L. ^{[6
]}

机构：

[1] Univ Toulouse, UPS OMP, LMTG, F-31400 Toulouse, France

[2] CNRS, LMTG, F-31400 Toulouse, France

[3] LMTG, IRD, F-31400 Toulouse, France

[4] Oak Ridge Natl Lab, Div Chem Sci, Oak Ridge, TN 37831 USA

[5] Oak Ridge Natl Lab, Div Sci, Oak Ridge, TN 37831 USA

[6] Illinois State Water Survey, Champaign, IL 61820 USA

来源：

JOURNAL OF SOLUTION CHEMISTRY | 2009年 / 38卷 / 07期

关键词：

Amines; Magnetite; Surface charge; Corrosion; Acid-dissociation constants; High temperature; PROTONATION EQUILIBRIUM-CONSTANTS; APPARENT MOLAR VOLUMES; TEMPERATURE-DEPENDENCE; ZERO CHARGE; THERMODYNAMIC PROPERTIES; PARTICLE ADHESION; HEAT-CAPACITIES; MODEL SYSTEMS; IONIZATION; ION;

D O I：

10.1007/s10953-009-9419-y

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：

Specific studies detailing the effects of amines, used as pH control agents for corrosion inhibition in power plants, on the surface charge of iron oxides provide data to assess the mechanism of how these amines impact deposition rate. The current study was undertaken in order to determine accurately the dissociation constants of the relevant amines at Pressurized Water Reactor (PWR) operating conditions and to investigate the effect of sorption of two of these amines (morpholine and dimethylamine) by magnetite. The acid-dissociation equilibria of morpholine (MOR), dimethylamine (DMA) and ethanolamine (ETA) were measured potentiometrically with a hydrogen-electrode concentration cell (HECC) from 0 to 290 A degrees C in sodium trifluoromethanesulfonate (NaTr) solutions at ionic strengths up to 1 mola <...kg(-1). Magnetite surface titrations were performed at an ionic strength of 0.03 mola <...kg(-1) (NaTr medium) in the presence or absence of morpholine and dimethylamine buffers over a wide range of pH and total amine concentrations at 150-250 A degrees C.

引用

页码：925 / 945

页数：21

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