Abstract
The effect of sodium thiosulfate (Na2S2O3) on trace mercury removal from aqueous solution by in situ MnOx was investigated. Removal efficiency was studied at different molar ratios of Na2S2O3/Mn (0, 0.264, 0.593 and 1.582) and under changes in Mn dosage, reaction time and pH conditions. Additionally, the ionic strength and the mercury removal amount were examined to evaluate the efficiency of trace mercury removal. The results indicated that the presence of thiosulfate clearly improved removal of mercury from solution, and that increases in the ionic strength enhanced removal in a certain range of thiosulfate concentration. At neutral conditions, the mercury removal amount reached to maximum of 64 μg/mg. It is proposed that the ability of thiosulfate to reduce some MnOx to Mn2+ as well as transfer the uncharged mercury species to a negatively charged species ([Hg(S2O3)2]2−) improved trace mercury removal. The mechanism analysis revealed that ternary complexes or large aggregations may be formed because of surface complexation or electrostatic attraction.
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