title: Arsenic immobilization as alunite-type phases: the arsenate substitution in alunite and hydronium alunite.
abstract: AsO4-for-SO4 substitution in alunite (KAl3(SO4)2(OH)6) and hydronium alunite ((H3O)Al3(SO4)2(OH)6) has been investigated by hydrothermal precipitation at 200°C. Arsenical alunite presented a good precipitation yield and a significant AsO4 substitution (up to 15% molar). The degree of arsenate substitution depends on the solution composition. It increased as (AsO4/(AsO4+SO4))alunite ≅ 0.5 (AsO4/(AsO4+SO4))L. For (AsO4/(AsO4+SO4))L<0.26, arsenical alunite was the unique phase and, above this ratio, mansfieldite (AlAsO4·2H2O) co-precipitated. The a unit cell parameter is practically independent of the AsO4 substitution, but the c unit cell parameter increased consistently with the differences between the AsO1 and SO1 distances in tetrahedral sites of the structure. The maximum stability of arsenical alunite in short-term tests is between pH 5 and 8, with an As-solubilization of 0.01-0.03 mg/L in 24h. Long-term tests were performed at some synthesized samples at its natural pH. Arsenical alunite was stabilized at 0.3mg/L released As in 2.5 weeks. These values were similar to those obtained in pure and largely crystalline natural scorodite (0.4 mg/L released As), but lower than the obtained for synthetic scorodite (1.3mg/L released As). Thus, arsenical alunite could be effective for arsenic immobilization, especially for effluents or wastes containing large SO4/AsO4 ratio. Hydronium alunite presents a low precipitation yield and a very low arsenate incorporation (up to 1% molar). This may be related by the difficulty of substituting protonated H2O-for-OH(-) groups, due to the location of the H-bridges of the H3O in the structure. These characteristics make hydronium alunite unsuitable for arsenic immobilization.
authors.affiliation: Department of Materials Science and Metallurgical Engineering, University of Barcelona, Martí i Franquès 1, 08028 Barcelona, Spain. Electronic address: asunyer@ub.edu.
authors.forename: Alba
authors.initials: A
authors.lastname: Sunyer
authors.forename: Marta
authors.initials: M
authors.lastname: Currubí
authors.forename: Joan
authors.initials: J
authors.lastname: Viñals
mesh_terms: D017607:Aluminum Compounds / Q000737:chemistry*; D001149:Arsenates / Q000737:chemistry; D001151:Arsenic / Q000737:chemistry*; D001152:Arsenicals / Q000737:chemistry; D011232:Chemical Precipitation; D004785:Environmental Pollutants / Q000737:chemistry*; D006863:Hydrogen-Ion Concentration; D017680:Potassium Compounds / Q000737:chemistry*; D013431:Sulfates / Q000737:chemistry*
chemical_list: D017607:Aluminum Compounds; D001149:Arsenates; D001152:Arsenicals; D004785:Environmental Pollutants; D017680:Potassium Compounds; D013431:Sulfates; C473131:alunite; C548094:scorodite; D001151:Arsenic; C025657:arsenic acid
keywords: Alunite; Arsenic; Hydronium alunite; Scorodite; Stabilization