School of Energy & Mechanical Engineering, Nanjing Normal University, Nanjing 210042, China.
Bioresour Technol. 2013 May;136:182-7. doi: 10.1016/j.biortech.2013.02.087. Epub 2013 Mar 4.
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 μg g(-1)) than any other MT chars.
桑枝炭通过热解、蒸汽活化和浸渍 H2O2、ZnCl2 和 NaCl 制备而成。使用氮气吸附和 FTIR 分别对其进行了结构特征和表面官能团分析。在石英固定床吸附器中研究了不同改性 MT 炭的汞吸附性能。结果表明，蒸汽活化和 H2O2 浸渍可以显著改善孔结构，而 H2O2 浸渍和氯化物浸渍则促进了表面官能团的形成。然而，氯化物浸渍对孔结构有不利影响。浸渍 10%或 30%H2O2 的 MT 炭的汞吸附容量分别是蒸汽活化 MT 炭的 2.02 倍和 1.77 倍。ZnCl2 浸渍 MT 炭的汞吸附容量随 ZnCl2 含量的增加而增加，在相同氯化物含量下优于 NaCl 浸渍 MT 炭。经蒸汽活化后再浸渍 5%ZnCl2 制得的改性 MT 炭（MT873-A-Z5）的汞吸附容量（29.55μg g(-1)) 高于其他 MT 炭。
