The Removal Of Elemental Mercury And Mercury Ion Detection

Mercury pollution has become an increasing concern. Due to strong persistence, volatility and bio-accumulation, mercury has become the focus of pollution prevention and control. Coal combustion is the main source of pollution of atmospheric mercury emissions. Mercury in the flue gas is divided into three types:elemental mercury (Hg°), divalent mercury (Hg2+) and particulate mercury (HgΡ). Divalent mercury can be removed by flue gas desulfurization devices and most of the particulate mercury can also be captured by electrostatics precipitators or fabric filters. However, elemental mercury is difficult to be removed by existing air pollution control devices, which can participate in the atmospheric circulation in the atmosphere. Elemental mercury is the most difficult to be removed. Thus the way that elemental mercury is oxidized to divalent mercury, is effective to control mercury pollution.In this paper, the research is focused on the oxidation of elemental mercury and divalent mercury ion recognition.1. The three manganese complexes blended with organic film easily were designed and synthesized, which were characterized by NMR, mass spectrometry and other methods. Electrochemical test found that the potential of these three complexes respectively were1.03V,1.25V and IV. The standard potential of the redox-pair Hg/Hg2+is0.85V. Therefore, in theory, these three complexes may be used to mercury oxidation. Further experimental studies have shown that the three complexes are able to oxide elemental mercury. The mercury ion concentration increased obviously. These three complexes have potential applications in the removal of elemental mercury in the flue gas.2. A rhodamine-based fluorescent probe for mercury ion was designed and synthesized. After adding mercury ion, ultraviolet absorption and fluorescence intensity had enhanced significantly, and the solution color was from colorless to pink. The probe for mercury ion recognition has a good reversibility. This probe has potential applications in magnetic resonance imaging.