Mercury adsorption of modified mulberry twig chars in a simulated flue gas
Mercury adsorption of modified mulberry twig chars in a simulated flue gas
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改性桑枝炭在模拟烟气中的汞吸附
DOI：
10.1016/j.biortech.2013.02.087
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发表时间：
2013-05-01
影响因子：
11.4
通讯作者：
He, Nan
中科院分区：
文献类型：
--
作者：
Shu, Tong;Lu, Ping;He, Nan
以桑葚为原料，采用热解、水蒸气活化、H2 O2、ZnCl 2和NaCl浸渍等方法制备桑树枝炭。分别用氮气吸附法和红外光谱法对样品的织构特征和表面官能团进行了表征。在石英固定床吸附器上研究了不同改性MT半焦对汞的吸附性能。结果表明，水蒸气活化和H2 O2浸渍能显著改善多孔材料的孔结构，H2 O2浸渍和氯化物浸渍能促进多孔材料表面官能团的形成。但氯化物浸渍对孔结构有不利影响。用10%和30%H_2O_2浸渍的MT半焦对汞的吸附容量分别是水蒸气活化的MT半焦的2.02和1.77倍。ZnCl 2浸渍的MT半焦对汞的吸附能力随ZnCl 2含量的增加而增加，且在相同氯化物含量下，ZnCl 2浸渍的MT半焦对汞的吸附能力优于NaCl浸渍的MT半焦。通过用5%ZnCl 2浸渍后蒸汽活化制备的改性MT炭（MT 873-A-Z 5）表现出比任何其它MT炭更高的汞吸附容量（29.55 μ g g（-1））。(C)2013爱思唯尔有限公司保留所有权利。
Mulberry twig chars were prepared by pyrolysis, steam activation and impregnation with H2O2, ZnCl2 and NaCl. Textural characteristics and surface functional groups were performed using nitrogen adsorption and FTIR, respectively. Mercury adsorption of different modified MT chars was investigated in a quartz fixed-bed absorber. The results indicated that steam activation and H2O2-impregnation can improve pore structure significantly and H2O2-impregnation and chloride-impregnation promote surface functional groups. However, chloride-impregnation has adverse effect on pore structure. Mercury adsorption capacities of impregnated MT chars with 10% or 30% H2O2 are 2.02 and 1.77 times of steam activated MT char, respectively. Mercury adsorption capacity of ZnCl2-impregnated MT char increase with increasing ZnCl2 content and is better than that of NaCl-impregnated MT char at the same chloride content. The modified MT char (MT873-A-Z5) prepared by steam activation following impregnation with 5% ZnCl2 exhibits a higher mercury adsorption capacity (29.55 mu g g(-1)) than any other MT chars. (C) 2013 Elsevier Ltd. All rights reserved.