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  1. University of Mandalay
  2. Department of Chemistry

Thermodynamic studies of dodecylpyridinium ion binding to humic acid and effect of solution parameters on their binding

http://hdl.handle.net/20.500.12678/0000000714
http://hdl.handle.net/20.500.12678/0000000714
3068768b-a9f7-4fa4-a7ad-736c2eb3af7b
146c0351-ff8f-4510-a2ee-d9a0f00cb677
Publication type
Journal article
Upload type
Publication
Title
Title Thermodynamic studies of dodecylpyridinium ion binding to humic acid and effect of solution parameters on their binding
Language en
Publication date 2007
Authors
Min Min Yee
Miyajima, Tohru
Takisawa, Noboru
Description
Thermodynamic information of dodecylpyridinium ions (C12Py+) binding to Aso humic acid (AHA) has been investigated by using potentiometric
titration method with surfactant-ion-selective membrane electrodes in aqueous solution of pH 9.18. No significant change in binding
has been observed with changing the temperature in C12Py+–AHA system. The enthalpy of C12Py+ ions binding with AHA is slightly negative.
The solution parameters, such as pH and ionic strength affect the binding. The binding strength is most pronounced at pH 9.18 since
the functional groups of AHA are fully ionized and the degree of dissociation (α) is unity at around pH 9.18. The binding strength decreases
with increasing ionic strength due to the ion-screening effect. The sensitivity of binding to electrolyte concentration is higher in AHA system
than that in Aso fulvic acid (AFA) system. The hydrodynamic diameters of C12Py+–AHA and C12Py+–AFA aggregates was measured
as a probe of their molecular interaction by dynamic light scattering (DLS) microscopy. In both AHA and AFA systems, the hydrodynamic
diameters increase with increasing surfactant concentration. DLS measurements also give the similar results of lower sensitivity of binding
to electrolyte concentration in AFA system. AHA concentration does not interfere the binding strength within the concentration range of
0.2–1.5 g dm−3.
Keywords
Aso humic acid
Identifier https://umoar.mu.edu.mm/handle/123456789/312
Journal articles
1–3
Colloids and Surfaces A: Physicochemical and Engineering Aspects
295
Conference papaers
Books/reports/chapters
Thesis/dissertations
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