Surface Complexation Modeling of K+, NO3−, SO42−, Ca2+, F−, Co2+, and Cr3+ Ion Adsorption on Silica Gel

Modeling and electrokinetic evidences on the processes of the Al(III) sorption continuum in SiO2(s) suspension

“…This finding suggests that Al(III) tends to form an inner-sphere complex, which bonds strongly to the o-plane [41]. From previous studies, the structure of strongly sorbed surface species is generally described as monodentate or bidentate inner-sphere complexes at low and moderate surface coverage, and as multinuclear species and surface precipitation at high surface coverage [17][18][19]42]. Fig.…”

Influence of kinetics on the determination of the surface reactivity of oxide suspensions by acid–base titration

“…This drift value was often used, whatever the titrated solid, from low specific area oxides as ZnO (2-13 m 2 /g [14,15]) or Fe 2 O 3 (22 m 2 /g [10]) to oxides whose specific area is greater than 100 m 2 /g as γ -alumina [26][27][28] or silica [29]. In a few recent articles concerning α-FeOOH (94 m 2 /g) [30] or γ -alumina (140 m 2 /g) [31], authors have detailed the conditions of potential drift of the glass electrode (respectively <0.2 mV/min and <0.1 mV/h), but this is an exception.…”

Surface complexation modeling of Co(II) adsorption on mixtures of hydrous ferric oxide, quartz and kaolinite

“…The adsorption of Co as a function of pH has been studied using macroscopic laboratory methods on simple solids including hydrous ferric oxide (Kurbatov et al 1951a,b;Kurbatov and Wood, 1952;Duval and Kurbatov, 1952;Benjamin and Bloom, 1981;Benjamin, 1983;Dzombak and Morel, 1990;Ainsworth et al, 1994), kaolinite (Angove et al, 1998;Benyahya and Garnier, 1999;Chen and Hayes, 1999;Ikhsan et al, 1999) and quartz or silica (James and Healy, 1972;O'Day et al 1996;Chen and Hayes, 1999;Berka and Banyai, 2001;Chen et al, 2006). X-ray absorption spectroscopy has been used to characterize the nature of Co surface complexes on quartz (Charlet and Manceau, 1994;O'Day et al, 1996;Manceau et al, 1999;Chen et al, 2006) and several clay minerals (Chisholm-Brause et al, 1990;O'Day et al, 1994;Charlet and Manceau, 1994;Chen and Hayes, 1999;Schlegel et al, 1999a,b;Thompson et al, 1999Thompson et al, , 2000.…”

“…Co adsorption on hydrous ferric oxide (HFO) has been described previously using a DLM (Dzombak and Morel, 1990;Ainsworth et al, 1994) or TLM (Criscenti and Sverjensky, 1999). On silica, Co adsorption has been described using a TLM (Berka and Banyai, 2001). Co adsorption on kaolinite has been modeled using a CCM (Angove et al, 1998;Ikhsan et al, 1999) or DLM (Benyahya and Garnier, 1999).…”

“…Although all of these models are useful for describing Co adsorption in single sorbent systems, the lack of coherence between model approaches makes it difficult to use these models directly to make predictions for Co sorption in multisorbent systems. Furthermore, many of the SCMs have been parameterized using Co data measured at only a single ionic strength (e.g., Angove et al, 1998;Benyahya and Garnier, 1999;Ikhsan et al, 1999;Berka and Banyai, 2001) and often over relatively narrow ranges of pH and sorbate to sorbent ratio. This makes it quite difficult to use these models to test the potential applicability of the derived DLM parameters to natural systems.…”