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Title: Apparent inhibition of thermal decomposition of hydrogencarbonate ion by poly(acrylic acid): The effect of molar mass and end-group functionality
Contributor(s): Al-Hamzah, Ali (author); Fellows, Chris (author)orcid 
Publication Date: 2014
DOI: 10.1016/j.desal.2013.10.021
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Abstract: The thermal decomposition of the hydrogencarbonate ion has been previously described by a bimolecular mechanism or a unimolecular mechanism. In this work the Gibbs free energy of the competing reactions for both the unimolecular and bimolecular mechanisms was calculated for typical concentrations found in thermal desalination plants. Activity coefficients were estimated using the Pitzer equations. At low temperature the bimolecular mechanism is thermodynamically favored, while above 80 °C the unimolecular mechanism is favored, consistent with observations of alkaline scale formation in thermal desalination plants. The rate coefficient of thermal decomposition of HCO₃⁻ at 97.2 °C in the absence and presence of 10 ppm of poly(acrylic acid) (PAA) with different end groups and molar mass was determined. PAA was found to retard the rate of decomposition by up to 49% and for all end groups of PAA the rate coefficient of thermal decomposition of 40 ppm HCO₃⁻ increased with increasing molar mass. The results are consistent with PAA preventing heterogeneous decomposition of HCO₃⁻ on interfaces. The rate of partitioning of PAA to these interfaces should increase with decreasing molar mass and resulting mobility of PAA, and may also be affected by self-assembly behavior.
Publication Type: Journal Article
Source of Publication: Desalination, 332(1), p. 33-43
Publisher: Elsevier BV
Place of Publication: The Netherlands
ISSN: 1873-4464
Field of Research (FOR): 030603 Colloid and Surface Chemistry
030602 Chemical Thermodynamics and Energetics
030304 Physical Chemistry of Materials
Peer Reviewed: Yes
HERDC Category Description: C1 Refereed Article in a Scholarly Journal
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Appears in Collections:Journal Article
School of Science and Technology

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