Removal of elemental mercury by iodine-modified rice husk ash sorbents

查看全文 作　　者：Pengfei Zhao,Xin Guoff,Chuguang Zheng State Key Laboratory of Coal Combustion,Huazhong University of Science and Technology,Wuhan 430074,China

出　　处：《Journal of Environmental Sciences》索引2010年第22卷第10期,共8页

基　　金：supported by the National Natural Science Foundation of China(NSFC)(No.50506011, 50936004);the partial funding from the Science Foundation of Huazhong University of Science and Technology (No.M2009009);the Ministry of Science and Technology of China(No.2006CB705806) 摘　　要：Iodine-modified calcium-based rice husk ash sorbents(I2/CaO/RHA) were synthesized and characterized by X-ray diffraction,X-ray fluorescence,and N2 isotherm adsorption/desorption.Adsorption experiments of vapor-phase elemental mercury(Hg0) were performed in a laboratory-scale fixed-bed reactor.I2/CaO/RHA performances on Hg0 adsorption were compared with those of modified Ca-based fly ash sorbents(I2/CaO/FA) and modified fly ash sorbents(I2/FA) .Effects of oxidant loading,supports,pore size distribution,iodine impregnation modes,and temperature were investigated as well to understand the mechanism in capturing Hg0.The modified sorbents exhibited reasonable effciency for Hg0 removal under simulated flue gas.The surface area,pore size distribution,and iodine impregnation modes of the sorbents did not produce a strong effect on Hg0 capture effciency,while fair correlation was observed between Hg0 uptake capacity and iodine concentration.Therefore,the content of I2 impregnated on the sorbents was identified as the most important factor influencing the capacity of these sorbents for Hg0 uptake.Increasing temperature in the range of 80-140°C caused a rise in Hg0 removal.A reaction mechanism that may explain the experimental results was presumed based on the characterizations and adsorption study. 关键词：钙基吸附剂汞元素稻壳灰改性粉煤灰碘实验室规模修饰固定床反应器

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Removal of elemental mercury by iodine-modified rice husk ash sorbents

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