Effect of amines on the surface charge properties of iron oxides

Pascale Bénézeth; David J. Wesolowski; Donald A. Palmer; Michael L. MacHesky

doi:10.1007/s10953-009-9419-y

Effect of amines on the surface charge properties of iron oxides

Pascale Bénézeth, David J. Wesolowski, Donald A. Palmer, Michael L. MacHesky

Research output: Contribution to journal › Article › peer-review

Abstract

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∈°C in sodium trifluoromethanesulfonate (NaTr) solutions at ionic strengths up to 1 mol · kg^-1. Magnetite surface titrations were performed at an ionic strength of 0.03 mol · 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∈°C.

Original language	English (US)
Pages (from-to)	925-945
Number of pages	21
Journal	Journal of Solution Chemistry
Volume	38
Issue number	7
DOIs	https://doi.org/10.1007/s10953-009-9419-y
State	Published - Jul 2009
Externally published	Yes

Keywords

Acid-dissociation constants
Amines
Corrosion
High temperature
Magnetite
Surface charge

ASJC Scopus subject areas

Biophysics
Biochemistry
Molecular Biology
Physical and Theoretical Chemistry

Online availability

10.1007/s10953-009-9419-y

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title = "Effect of amines on the surface charge properties of iron oxides",

abstract = "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∈°C in sodium trifluoromethanesulfonate (NaTr) solutions at ionic strengths up to 1 mol · kg-1. Magnetite surface titrations were performed at an ionic strength of 0.03 mol · 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∈°C.",

keywords = "Acid-dissociation constants, Amines, Corrosion, High temperature, Magnetite, Surface charge",

author = "Pascale B{\'e}n{\'e}zeth and Wesolowski, {David J.} and Palmer, {Donald A.} and MacHesky, {Michael L.}",

note = "Funding Information: Acknowledgements Research sponsored by the Division of Chemical Sciences, Geosciences, and Biosciences, Office of Basic Energy Sciences, U.S. Department of Energy under contract DE-AC05-00OR22725, Oak Ridge National Laboratory, managed and operated by UT-Battelle, LLC and by EPRI, Inc. under the direction of P. Frattini and K. Fruzzetti.",

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AU - Palmer, Donald A.

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N1 - Funding Information: Acknowledgements Research sponsored by the Division of Chemical Sciences, Geosciences, and Biosciences, Office of Basic Energy Sciences, U.S. Department of Energy under contract DE-AC05-00OR22725, Oak Ridge National Laboratory, managed and operated by UT-Battelle, LLC and by EPRI, Inc. under the direction of P. Frattini and K. Fruzzetti.

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Effect of amines on the surface charge properties of iron oxides

Abstract

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