期刊
ENVIRONMENTAL SCIENCE & TECHNOLOGY
卷 48, 期 20, 页码 12181-12189出版社
AMER CHEMICAL SOC
DOI: 10.1021/es501966h
关键词
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资金
- National Natural Science Foundation of China [51206067]
- Open Research Fund Program of Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education (Southeast University)
- Key Laboratory of Efficient & Clean Energy Utilization
- College of Hunan Province (Changsha University of Science Technology)
- Training Project of Jiangsu University Youth Backbone Teacher
- New Teacher Fund for the Doctoral Program of Higher Education of China [20123227120016]
In this article, a novel technique on removal of elemental mercury (Hg-0) from flue gas by thermally activated ammonium persulfate ((NH4)(2)S2O8) has been developed for the first time. Some experiments were carried out in a bubble column reactor to evaluate the effects of process parameters on Hg-0 removal. The mechanism and kinetics of Hg-0 removal are also studied. The results show that the parameters, (NH4)(2)S2O8 concentration, activation temperature and solution pH, have significant impacts on Hg-0 removal. The parameters, Hg-0, SO2 and NO concentration, only have small effects on Hg-0 removal. Hg-0 is removed by oxidations of (NH4)(2)S2O8, sulfate and hydroxyl free radicals. When (NH4)(2)S2O8 concentration is more than 0.1 mol/L and solution pH is lower than 9.71, Hg-0 removal by thermally activated (NH4)(2)S2O8 meets a pseudo-first-order fast reaction with respect to Hg-0. However, when (NH4)(2)S2O8 concentration is less than 0.1 mol/L or solution pH is higher than 9.71, the removal process meets a moderate speed reaction with respect to Hg-0. The above results indicate that this technique is a feasible method for emission control of Hg-0 from flue gas.
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