Effect of Jarosite on the Removal of Arsenic ions in Sulfuric Acid Solution

Abstract

by Yuichi TOMIOKA This study investigated the role of jarosite in arsenic removal using flask shaking experiments in diluted sulfuric acid solutions (pH1-3). Jarosite was synthesized and the chemical composition of the jarosite was K 0.54 (H 3 O) 0.46 Fe 2.38 (SO 4 ) 2 (OH) 6 . The shaking experiments found that As(V) was removed by the jarosite but As(III) was not removed. The mechanisms of As(V) removal were adsorption on the jarosite and co-precipitation with Fe(III) extracted from jarosite. The removal of As(V) from the liquid phase were increased with increasing pH, indicating that the adsorption of As(V) and SO 4 2-is competitive or that ionic As species (H 2 AsO 4 -) is selectively adsorbed. The results suggest that jarosite is a sink for As(V) in acidic polluted environments.

Arsenic removal by goethite and jarosite in acidic conditions and its environmental implications

“…In the case of goethite, the effects of pH, initial arsenic concentration or the presence of other elements (silicic acid, dissolved organic carbon (DOC) or sulphate) on its arsenic sorption capacity have been reported in the literature. As regards jarosite, there have been few studies on its sorption capacity [20,21]. Likewise, there is little bibliography on arsenic sorption in highly acidic conditions with the result that the relative ability of jarosite and goethite to retain arsenic remains unclear [5].…”

“…Given that inorganic aqueous arsenic is an environmental and human health concern world-wide, a number of studies have addressed the use of different adsorbents [10] including schwertmannite [11,12], goethite [13][14][15][16][17][18][19], and jarosite [20,21] in an attempt to reduce its aqueous concentration. In the case of goethite, the effects of pH, initial arsenic concentration or the presence of other elements (silicic acid, dissolved organic carbon (DOC) or sulphate) on its arsenic sorption capacity have been reported in the literature.…”

Removal of Arsenic from Sulfuric Acid Solutions Using Jarosite and Sonication

“…We, therefore, focused on jarosite [KFe 3 (SO 4 ) 2 -(OH) 6 ], which forms under acidic conditions and adsorbs As. [4][5][6] It has been reported that the addition of jarosite into As-containing solutions enables the removal of pentavalent arsenic [As(V)]; but trivalent arsenic [As(III)] is difficult to remove. 5) The removal of As(III) requires the oxidation of As(III) to As(V) using oxidants.…”

Chemical Speciation of Arsenic-Accumulating Mineral in a Sedimentary Iron Deposit by Synchrotron Radiation Multiple X-ray Analytical Techniques

“…It is well-known that the co-occurrence of iron and arsenic can lead to the formation of hydrous iron oxides containing significant amounts of arsenic . Dissolved arsenic is often adsorbed by iron hydrosulfate, oxyhydroxides, and hydroxides such as jarosite [KFe 3 (SO 4 ) 2 (OH) 6 ] , , schwertmannite [Fe 8 O 8 (OH) 6 SO 4 ] , hematite (α-Fe 2 O 3 ) , goethite (α-FeOOH), and lepidocrocite (γ-FeOOH) . In addition, Vëronique et al found that synthesized Fe(III) phosphate, either amorphous or crystalline, can remove arsenic from waters.…”