Properties of synthetic monosulfate as a novel material for arsenic removal

► Highly pure monosulfate was synthesized and its validity was confirmed by analyses. ► Arsenate was intercalated in the interlayer of monosulfate by exchange of sulfate ion. ► Sorption behavior of As(V) showed a dramatic change with increase in As(V). ► The transformation of monosulfate to ettringite was observed at higher As(V) levels.