Ferrocyanide adsorption on aluminum oxides

Add time:09/02/2019    Source:sciencedirect.com

Ferrocyanide (Fe(CN)4−6) adsorption onto γ-alumina (γ-Al2O3(s)) and gibbsite (Al(OH)3(s)) was investigated over a wide pH range and at various solid loadings. Batch experiments were performed using 100-ml solutions (I=0.01 M NaCl) dosed with 1.0 mg l−1 Fe(CN)4−6 as CN. Equilibrium adsorption–pH edges were developed for 0.3, 0.6, 1.2, and 2.0 g l−1 γ-Al2O3(s) and 25 g l−1 Al(OH)3(s). Ferrocyanide adsorption increased as pH decreased, consistent with the general pH dependence for adsorption of anions onto oxide minerals. Ferrocyanide adsorption onto Al(OH)3(s) was approximately 300 times lower than onto γ-Al2O3(s) on a unit weight basis due to the higher surface reactivity of the γ-Al2O3(s). Ferrocyanide adsorption onto γ-Al2O3(s) was significantly greater than has been reported for goethite (FeOOH(s)), and both γ-Al2O3(s) and FeOOH(s) adsorbed ferrocyanide to a greater extent than Al(OH)3(s). The investigation showed that ferrocyanide can adsorb significantly onto aluminum oxides spanning a range of crystallinity and properties, with the extent of adsorption highly dependent on pH, the solid crystalline structure, and associated surface reactivity.

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