Modelling of the adsorption of phenolic acids onto α,γ–alumina particles

Recovery of hydroxycinnamic acids from renewable resources by adsorption on zeolites

“…It results from the protonation or dissociation of the hydroxyl groups (SiOH and AlOH). Thus complexes are probably formed involving silanol and aluminol sites of zeolite and hydroxyl and carboxyl groups of the phenolic compound [31][32]. At pKa 2 > pH > pKa 1 , the compound is mainly in the form of negatively charged carboxylate ions and at pH > pKa 2 the form of negatively charged phenolate ion is added.…”

Influence of adipic acid on the speciation of Eu(III): Review of thermodynamic data in NaCl and NaClO4 media, and a new determination of Eu-adipate complexation constant in 0.5 mol·kgw−1 NaClO4 medium by time-resolved luminescence spectroscopy

“…In less alkaline media, the adsorption of adipate has recently been shown in the case of the Callovo-Oxfordian claystone in France [67]. Studies on the eventual impact on adsorption of Eu(III) in presence of adipic acid would then be desirable including the formation of ternary surface complex formation [23,68]. a b Fig.…”

Water‐soluble phenolic metabolites in lichens and their potential role in soil organic matter formation at the pre‐vascular stage

“…Soluble phenolic compounds (PCs) comprise a characteristic and highly reactive part of soil organic matter (SOM). Their transformations in soil include complexation with metal ions (Andjelkovic et al, ), adsorption on to clays and oxyhydroxides (Moreau, Colette‐Maatouk, Gareil, & Reiller, ; Zavarzina, Ermolin, Demin, & Fedotov, ) and polymerization in the presence of oxidative catalysts (Huang & Hardie, ; Zavarzina, ). As a result, PCs have a profound effect on soil mineral and organic matrices, participating in element mobilization and mineral weathering and in formation of organic–mineral compounds.…”

“…• Phenolic composition of SOM and humification processes at pre-vascular stage are largely overlooked • Soluble phenolic acids, aldehydes and ketones are quantified in lichens for the first time • Lichens are depleted in phenylpropanoids and enriched in syringyl structures and monophenols • Lichen-derived phenolic compounds are potential precursors of humic substances under cryptogam cover 1 | INTRODUCTION Soluble phenolic compounds (PCs) comprise a characteristic and highly reactive part of soil organic matter (SOM). Their transformations in soil include complexation with metal ions (Andjelkovic et al, 2006), adsorption on to clays and oxyhydroxides (Moreau, Colette-Maatouk, Gareil, & Reiller, 2013;Zavarzina, Ermolin, Demin, & Fedotov, 2018) and polymerization in the presence of oxidative catalysts (Huang & Hardie, 2009;Zavarzina, 2011). As a result, PCs have a profound effect on soil mineral and organic matrices, participating in element mobilization and mineral weathering and in formation of organic-mineral compounds.…”