Abstract
A series of experiments were conducted in a bubble column reactor to investigate the effects of key influencing factors such as the diperiodatoargentate (III) concentration, the reaction temperature, the solution pH, O2 concentration, SO2 concentration and NO concentration on the Hg0 removal. The results indicated that the average removal efficiency of 77.5 % was reached under the optimal conditions in which the DPA concentration was 1.03mmol/L, the reaction temperature was 40 °C and the solution pH was 8.5; SO2 inhibited Hg0 oxidation due to its competition for the limited oxidant; when NO was in a low concentration, it was found to be a promotion for Hg0 oxidation. The spent solution was analyzed by the CVAFS, The results illustrated that Hg0 was oxidized into Hg2+ by DPA then DPA was converted into Ag+, from which, the reaction mechanism was speculated accordingly.
Acknowledgments
The authors appreciate the financial support by a grant from the key project of the National major research and development Program of China (No. 2016YFC0203700), the Fundamental Research Funds for the Central Universities (No. 2015ZZD07), the National Science-technology Support Plan of China (No. 2014BAC23B04-06), the Special Scientific Research Fund of Public Welfare Profession of China (No. 201309018) and the Beijing Major Scientific and Technological Achievement Transformation Project of China (No. Z151100002815012).
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