A mechanism study of chloride and sulfate effects on Hg2+ reduction in sulfite solution

作者：Liu, Yue; Wang, Yuejun; Wu, Zhongbiao^*; Zhou, Siyao; Wang, Haiqiang

来源：Fuel, 2011, 90(7): 2501-2507.

DOI：10.1016/j.fuel.2011.02.036

• Hg
• Mercury removal
• Reduction
• SO42-
• Cl-

This paper studied the effects of sulfate and chloride ions on bivalent mercury (Hg2+) absorption and reduction behaviors in a simulated WFGD system. The aqueous mercuric ion-sulfite system reduction behaviors were monitored and investigated using a UV-visible spectrum. Thereafter, the mechanism of Hg2+ reduction in the presence of sulfate and chloride ions was proposed. Experimental results revealed that both sulfate and chloride ions had inhibition effects on aqueous Hg2+ reduction to Hg-0. The inhibition was assumed due to the formation of HgSO3SO42- (in the presence of SO42-) and ClHgSO3-/Cl2HgSO32- (in the presence of Cl-). And it was found that Cl2HgSO32- complex was more stable than ClHgSO3- in excess of Cl-. The formation of the above-mentioned complexes in the presence of SO42- and Cl- would damp the formation of HgSO3, whose decomposition was assumed to be the key step of Hg2+ reduction.

• 出版日期2011-7
• 单位浙江大学