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Inne
Progress towards synthetic modelling of humic acid: peering into the physicochemical polymerization mechanism.
Autorzy
Rok wydania
2011
Czasopismo
Colloids and Surfaces A: Physicochemical and Engineering Aspects
Numer woluminu
389
Strony
254-265
DOI
10.1016/j.colsurfa.2011.08.016
Kolekcja
Język
Angielski
Typ publikacji
Artykuł
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 (Eh) 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 Eh 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 (VD) 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.
Adres publiczny
https://doi.org/10.1016/j.colsurfa.2011.08.016