Abstract
Schwertmannite (Sh), a poorly crystalline iron (hydr)oxide that usually appears in acid mine drainage, plays a significant role in the immobilization of As(V). In this study, the effects of UV irradiation and oxalate on the dissolution of Sh with structurally incorporated As(V) [Sh–As(V)] and the subsequent mobilization of As(V) were investigated at pH 3.0. In the dark, more total dissolved Fe was produced (the maximum value was 33.2 mg/L) in the suspensions of Sh–As(V) with oxalate than in those without oxalate. UV irradiation slightly enhanced the mobilization of As(V) for the system of Sh–As(V)-1 and Sh–As(V)-2 in the absence of oxalate compared with that in the dark. However, in the presence of oxalate, UV irradiation caused the concentration of mobilized As(V) to decline by 630–875% compared with that in the dark. This study enhanced our understanding of the mobilization of As(V) and demonstrated that UV irradiation could contribute to the immobilization of As(V) on Sh in aqueous environments containing oxalate.
Highlights
Arsenic (As) is a toxic contaminant that is mainly present in inorganic forms as oxyanions of trivalent arsenite [As(III)] or pentavalent arsenate [As(V)] in aqueous environments [1]
State Key Laboratory of Separation Membranes and Membrane Processes, School of Textiles, Tianjin Polytechnic University, Tianjin 300387, China (α-FeOOH), ferrihydrite (Fe5HO8·4H2O), lepidocrocite (γ-FeOOH), and schwertmannite [Sh; Fe8O8(OH)8-2x(SO4)x, 1.0 ≤ x ≤ 1.85] [6, 7]. On account of their natural abundance and surface absorptivity, ironoxides play a significant role in attenuating the concentration of arsenic in natural environments through adsorption and precipitation
We aimed to investigate the effect of oxalate and the amount of structurally incorporated As(V) on photoreductive dissolution of Sh–As(V) and the mobilization of As(V) involved in this process
Summary
Arsenic (As) is a toxic contaminant that is mainly present in inorganic forms as oxyanions of trivalent arsenite [As(III)] or pentavalent arsenate [As(V)] in aqueous environments [1]. Considering the severe toxicity of arsenic, the World Health Organization reduced the guideline for arsenic in drinking water from 50 to 10 μg/L in 1993 [4]. State Key Laboratory of Separation Membranes and Membrane Processes, School of Textiles, Tianjin Polytechnic University, Tianjin 300387, China (α-FeOOH), ferrihydrite (Fe5HO8·4H2O), lepidocrocite (γ-FeOOH), and schwertmannite [Sh; Fe8O8(OH)8-2x(SO4)x, 1.0 ≤ x ≤ 1.85] [6, 7]. On account of their natural abundance and surface absorptivity, iron (hydr)oxides play a significant role in attenuating the concentration of arsenic in natural environments through adsorption and precipitation. Dissolution of iron (hydr)oxides is of great importance to the mobilization of arsenic
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