Sorption of aqueous carbonic, acetic, and oxalic acids onto α-alumina

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

“…Parks [77] proposed that Na + do not sorb specifically onto Al 2 O 3 , meaning that its adsorption onto Al 2 O 3 particles is reversible. Similarly, Alliot et al [24] showed that Na + did not sorb significantly onto ␣-Al 2 O 3 at pH 5 whereas Cl − does. On the contrary, Adekola et al [45] suggested that Na + sorbs onto Al 2 O 3 , shifting the IEP to higher values.…”

“…(1) and (2), z = −1. This hypothesis implies that the sites attainable by titration are amphoteric which is not always verified [24]. The constant capacitance model (CCM) is the simplest description of the interface.…”

“…Indeed, they were evidenced in several humus of soils and in fruit peels [14][15][16][17][18][19][20] and these three acids differ only by adding an OH group on the aromatic ring. Adsorption of organic acids onto oxides is maximum for pH values around the pK a of acids [10,[21][22][23][24] and depends on several parameters such as pH, ionic strength, and number and position of ionizable polar functional groups [21,[24][25][26][27][28][29][30][31][32].…”

“…Moreover, a large body of organic acid adsorption works exists, which can be used for comparison [10,[21][22][23][24][26][27][28]30,31,[33][34][35]. Hence, our aim was to probe the role of the number of phenolate group for adsorption of phenolic acids (H 2 Phb, H 2 Proto and H 2 Gal, hereafter noted H 2 A, i.e., only the two proton will be apparent) onto aluminum oxide.…”

Effects of organic acids on Eu(III) sorption on Na-bentonite

“…Acetic acid, citric acid, oxalic acid, salicylic acid are the typical representatives of root secreta, which may modify the retention of heavy metals. Moreover, simple organic acids themselves are sometimes pollutants and co-exist with heavy metals in the environment [17][18][19][20][21][22][23][24][25]. For these reasons, it is significant to study the effects of organic acids on heavy metals sorption.…”