Progress towards synthetic modelling of humic acid: Peering into the physicochemical polymerization mechanism

 
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2011 (EN)
Progress towards synthetic modelling of humic acid: Peering into the physicochemical polymerization mechanism (EN)

Drosos, M. (EN)

Πανεπιστήμιο Ιωαννίνων. Σχολή Θετικών Επιστημών. Τμήμα Χημείας (EL)
Drosos, M. (EN)

Oxidative copolymerization of gallic acid (GA) and protocatechuic acid (PA) at 1:1 ratio provides a water soluble humic-acid-like polycondensate (HALP) which mimics fundamental physicochemical and spectroscopic properties of natural humic acid (HA). The redox potential (E(h)) of polymerization plays a determinative role on the physicochemical, spectroscopic and H-binding properties of the HALP as well as on the mass yield. Trends have been systematically mapped and analyzed for two E(h) values, e.g. 0 mV (HALP_0) and 100 mV (HALP_100). HALP_100 has physicochemical properties, prevailing aliphatic structure, which resemble those of fulvic acids (FAs) or soil-type HAs. HALP_0 has a prevailing aromatic/phenol structure which resembles lignite-like HAs. Ionic strength had a significant impact on the charge and H-binding properties of the HALP_100. Donnan volume (V(D)) estimates show that HALP_100 has a more expanded structure. A molecular model is suggested for the polymerization reactions in connection with the observed macromolecular, spectroscopic and H-binding characteristics of the HALPs and natural HAs. (C) 2011 Elsevier B.V. All rights reserved. (EN)

synthetic humic acid (EN)

Πανεπιστήμιο Ιωαννίνων (EL)
University of Ioannina (EN)

Colloids and Surfaces a-Physicochemical and Engineering Aspects (EN)

English

2011

<Go to ISI>://000296937900036

Elsevier (EN)



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