Study on absorption of elemental mercury from flue gas by UV/H2O2: Process parameters and reaction mechanism
Study on absorption of elemental mercury from flue gas by UV/H2O2: Process parameters and reaction mechanism
复制标题
UV/H2O2吸收烟气中元素汞的研究：工艺参数和反应机理
DOI：
10.1016/j.cej.2014.03.080
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发表时间：
2014-08-01
影响因子：
15.1
通讯作者：
Yin, Yanshan
中科院分区：
文献类型：
--
作者：
Liu, Yangxian;Zhang, Jun;Yin, Yanshan
研制了一种新型的光化学反应器，用于紫外光(UV)/双氧水氧化烟气中的汞(Hg0)。考察了几个参数对Hg0-0去除效果的影响。提出了去除汞的反应机理。结果表明，254 nm是去除Hg0的最有效波长。当单位溶液的紫外光能量密度从0增加到0.0056 W/m L时，Hg0的去除效率从11.7%提高到85.1%。当H_2O_2浓度从0增加到0.50m ol/L时，汞的去除效率从59.4%增加到85.1%，当H_2O_2浓度从0.50增加到1.0m ol/L时，汞的去除效率从85.1%下降到77.3%。增加O-2浓度(0-12.0%)，可使汞的脱除效率从59.4%提高到87.6%。溶液温度对汞的去除影响很小。Hg2+是去除Hg0-的最终反应产物，Hg2+通过过氧化氢、‘OH、’O-3的氧化和紫外光激发来去除Hg2+。(C)2014 Elsevier B.V.保留所有权利。
A novel photochemical reactor is developed and is used to oxidize elemental mercury (Hg-0) from flue gas by ultraviolet (UV)/H2O2 process. The effects of several parameters on Hg-0 removal were investigated. The reaction mechanism of Hg-0 removal is also proposed. The results indicate that 254 nm is the most effective wavelength for Hg-0 removal. When UV energy density per unit solution increases from 0 to 0.0056 W/mL, Hg-0 removal efficiency increases from 11.7% to 85.1%. Hg removal efficiency increases from 59.4% to 85.1% when H2O2 concentration increases from 0 to 0.50 mol/L, but reduces from 85.1% to 77.3% when H2O2 concentration further increases from 0.50 to 1.0 mol/L. With solution pH increasing from 1.21 to 10.01, Hg-0 removal efficiency sharply reduces from 88.2% to 54.0%. Increasing O-2 concentration (0-12.0%) makes Hg-0 removal efficiency greatly increases from 59.4% to 87.6%. Solution temperature only has a small impact on Hg removal. Hg2+ is the final reaction product of Hg-0 removal, and Hg-0 is removed by the oxidations of H2O2, 'OH, 'O, O-3 and the photoexcitation of UV. (C) 2014 Elsevier B.V. All rights reserved.