活性炭的孔结构及粒度对水溶液中汞离子吸附的影响  

EFFECT OF PORE STRUCTURE AND PARTICLE SIZE OF ACTIVATED CARBONS ON ADSORPTION OF Hg^(2+) IN AQUEOUS SOLUTIONS

作　　者：李自航 王亮梅[2] 李瑛[1] 

机构地区：[1]浙江工业大学工业催化研究所,310032 [2]杭州水处理技术研究开发中心,浙江杭州310012

出　　处：《水处理技术》2015年第11期54-58,共5页Technology of Water Treatment

摘　　要：采用木质活性炭为原料,统一用氢气处理的方法消除了表面化学基团,研究了活性炭的孔结构及粒度尺寸对水溶液中Hg2+吸附性能的影响。结果表明,活性炭的孔结构对溶液中Hg2+的吸附性能影响较大,其中比表面积高,中孔比例大的活性炭对Hg2+的吸附能力较强,相同含量条件下,中孔比例大,比表面积高的活性炭对Hg2+的去除率高,而活性炭的粒度对于Hg2+的吸附基本没有影响。微孔活性炭上的吸附等温线更符合Langmuir方程,而中孔比例高的活性炭上的吸附等温线更符合Freundlich方程。当活性炭的比表面积大于2 000 m2/g时,对氯化汞的饱和吸附量可达1 343 mg/g。Activated carbons with different pore structures were first pretreated at high temperature under H2 flow to minimize the influence of surface chemical properties. The effect of the pore structure and particle sizes of various AC on the adsorption properties of mercury ions from aqueous solutions was studied. The experimental results show that AC with high surface area and high fraction of mesopores have large adsorption capacity of Hg^2＋. The particle size of AC has no affect on the adsorption capacity of Hg^2＋. The Freundlich adsorption model is more suitable than Langmuir adsorption model for the simulation of the adsorption behavior of mercury ions on AC with high fraction of mesopores. Langmuir adsorption model fit well with experimental data for AC with high fraction of micropores. The equilibrium adsorption capacity of HgCl2 on AC can reach 1 343 mg/g when the surface area of AC higher than 2 000 m^2/g.

关 键 词：活性炭 HG^2+ 重金属离子去除 孔结构 

分 类 号：TQ424.1[化学工程]