Inner- and outer-sphere complexation of ions at the goethite–solution interface

Adsorption Behavior of Beryllium(II) on Copper-oxide Nanoparticles Dispersed in Water: A Model for 7Be Colloid Formation in the Cooling Water for Electromagnets at High-energy Accelerator Facilities

“…Previous studies show that the mechanism of adsorption of metal ions on metal oxide particles can be explained by complex formation between the surface -OH sites on the metal oxides and metal ions in water. [13][14][15][16][17] It has been found that the surface complexation constants of some metal oxides for metal ions and the hydration constants of metal ions show good correlation. 17 Be(II) is recognized to be readily hydrated, [18][19][20] and thus it can be expected that the surface -OH sites of metal oxides should have a large adsorptivity for Be(II) in water.…”

“…Herein, the zeta potentials, average particle diameters, and surface -OH concentrations were determined for the CuO nanoparticles in the CuO/water suspension state. It is well known that the acid-base properties of -OH sites on metal oxide surfaces in water can be represented as the reactions expressed as follows [13][14][15][16][17] : (2) progress around pH 5 and 9, respectively. Thus, the surface -OH sites on CuO are in the neutral >S-OH form in the pH range from 5 to 9.…”

“…(5) are not the same as those of other literature values. [13][14][15][16][17] Thus, the values of the surface complexation constants in Table 2 cannot be directly compared with the appropriate reported equilibrium constants.…”

Cu2+ and Ca2+adsorption to goethite in the presence of fulvic acids

“…In the previous work, CD-MUSIC model parameters for Ca adsorption to goethite have been derived (Weng et al, 2005), in which one innersphere surface species between singly coordinated surface sites and calcium ion was considered. Recently, Rahnemaie et al, 2006a suggested to include both innersphere and outersphere complexes (Table 3). Using these surface species, Stachowicz et al can describe several data sets of Ca adsorption to goethite (Stachowicz et al, 2008).…”

Adsorption Behavior of Trace Beryllium (II) onto Metal Oxide Nanoparticles Dispersed in Water

“…On the other hand, metal oxides are naturally present as colloidal nanoparticles in aquatic systems and play an important role in the distribution and diffusion of trace metals in the environment (Brown & Parks, 2001). The mechanism of the adsorption of metal ions on metal oxides is generally explained by complex formation between the surface hydroxyl groups of the oxides and the metal ions in water (Balistrieri, Brewer, & Murray, 1981;Stumm et al, 1987;Rahnemaie, Hiemstra, & Van Riemsdijk, 2006;Sverjensky, 2006).…”