ZnCl_2法污泥含炭吸附剂对模拟烟气中气态汞的吸附

Hg vapor adsorption of sludge carbon adsorbents made by ZnCl_2 chemical activation in simulated flue gas

采用改进的ZnC l2化学活化法制备污泥含炭吸附剂,利用EDS以及氮吸附等多种测试手段对所制得的污泥含炭吸附剂进行表征,并利用其处理模拟烟气汞污染物,实验结果表明,污泥含炭吸附剂对Hg0的吸附包括物理吸附作用和化学吸附作用,以物理吸附作用为主;随着Hg0入口浓度的提高,污泥含炭吸附剂的Hg0饱和吸附容量增大;随着吸附反应温度的升高污泥含炭吸附对Hg0的吸附作用减弱;在吸附反应温度125℃,Hg0入口浓度60.4μg/m3,污泥含炭吸附剂和选定的活性炭对Hg0的吸附容量分别为81.2μg/g和53.8μg/g,污泥含炭吸附剂对Hg0的吸附作用好于选定的活性炭。

Sludge carbon adsorbent was made by the improved ZnC12 chemical activation,EDS and the nitrogen adsorption tests were used to characterize the sludge carbon adsorbents,and it wus used to remove the mercury in simulated flue gas. The results indicated that Hg vapor adsorption of sludge carbon adsorbents included physical adsorption and chemical adsorption, in the two adsorption mechanisms physical adsorption was main. When the concentration of mercury was increased, saturated adsorption capacity of sludge carbon adsorbent for mercury was increased. When the reaction temperature was increased, the mercury adsorption process of sludge carbon adsorbent was decreased. When the reaction temperature was 125℃ , concentration of mercury was 60. 4μg/m3 , the saturated adsorption capacity of sludge carbon adsorbent and selected activated carbon was 81.2μg/ g and 53.8μg/g, the adsorption of mercury by sludge carbon adsorbent was better than that of selected activated carbon.