Macroscopic and spectroscopic characterization of selenate, selenite, and chromate adsorption at the solid–water interface of γ-Al2O3

Adsorption of Cr(VI) on γ-alumina in the presence and absence of CO2: Comparison of three surface complexation models

“…Increasing the background electrolyte concentration from 0.001 to 0.1 M NaNO 3 has very little influence on Cr(VI) adsorption, except that adsorption decreases somewhat at pH < 7 in experiments with 0.1 M NaNO 3 and 10 À4 M Cr(VI). In agreement with this observation, two prior studies using higher concentrations of Cr (1 Â 10 À3 or 5 Â 10 À3 M) report more of a decrease in sorption at low pH with increasing ionic strength (Wu et al, 2000;Elzinga et al, 2009).…”

“…Furthermore, because c-alumina contains both octahedrally and tetrahedrally coordinated aluminum, it has been used as an analog for surface aluminol groups on aluminosilicate minerals (Brady and Walther, 1989;Casey et al, 1989). A few studies demonstrate significant Cr(VI) sorption on c-alumina (Mayer and Schick, 1981;Mikami et al, 1983;Wu et al, 2000;Fritzen et al, 2006;Elzinga et al, 2009), as well as on a-alumina (Honeyman, 1984;Ajouyed et al, 2007;Musorrafiti et al, 2008), which also has a high pH ZPC (5-9.3: Kosmulski, 2002Kosmulski, , 2004Kosmulski, , 2006 but contains only octahedrally-coordinated aluminum.…”

Adsorption of Selenite and Selenate by Metal Oxides Studied with Fluorescent DNA Probes for Analytical Application

“…To address its environmental concerns, studies have been performed to remove selenium species from water and soil, or to retard its migration. A few materials were tested for this purpose, including iron oxide [4][5][6], alumina [7,8], and titania [9]. In particular, iron containing oxide, hydroxide, and minerals has been the most extensively studied for this purpose [3,[10][11][12].…”

Bayer Electrofilter Fines as Potential Se(VI) Adsorbents

“…This finding is in agreement with other studies investigating Se(VI) sorption onto different adsorbents. 24,27,30,32,39,40 As reported by other researchers, Se(VI) adsorption is dependent on the strength of the background electrolyte. The ionic strength influences the doublelayer thickness and affects the binding of the adsorbing ions.…”

“…It has been reported that the adsorption of anions at the oxide/water interfaces is generally assumed to take place via a surface complexation mechanism. [21][22][23][24][25][26][27][28][29][30][31][32][33][34] No reports have been published to date on the relationship between Bayer electrofilter fines (BEFs) and their ability to adsorb selenate ions. The aim of this study is to examine the adsorption of selenate ions from an aqueous solution onto BEFs.…”