活性炭表面改性对水溶液中汞离子吸附行为的影响  

EFFECT OF ACTIVATED CARBON SURFACE MODIFICATION ON THE ADSORPTION OF Hg^(2+)IN AQUEOUS SOLUTIONS

作　　者：王亮梅[1] 姜维[2] 朱淑飞[1] 李瑛[2] 

机构地区：[1]杭州水处理技术研究开发中心,310012 [2]浙江工业大学工业催化研究所,浙江杭州310014

出　　处：《水处理技术》2013年第9期41-44,48,共5页Technology of Water Treatment

摘　　要：活性炭的表面化学性质对重金属的吸附性能具有较大的影响,采用椰壳活性炭为原料,研究了不同的处理方法对活性炭表面性质的影响及活性炭的处理方法对水溶液中汞离子吸附性能的影响。结果表明,经过氢气处理的活性炭表面以碱性基团为主,对汞离子的吸附能力最强,经过液相氧化处理的活性炭表面以酸性基团为主,对汞离子的吸附能力降低。采用Freundlich吸附模型比Langmuir吸附模型更能有效模拟活性炭对水溶液中汞离子的吸附行为,表面呈碱性的活性炭更有利于水溶液中汞离子的吸附。为工业废水中重金属离子去除的高效吸附剂的开发提供参考。The surface chemistry of activated carbon （AC） has important effect on the adsorption behavior of heavy metal ions from anqueous solutions. The effect of various pretreatments of AC on the surface properties of AC and the adsorption properties of mercury ions from aqueous solutions was studied. The experimental results show that the pretreatment of AC by H~ under high temperatures can remove the surface acidic fimctional groups on AC and improve the basic fimctional groups, and thus improve the adsorption capacity of mercury ions. The pretreatment of AC under HNO3 can improve the acidic functional groups, but decrease the adsorption capacity of mercury ions. The Freundlich adsorption model is more suitable than Langmuir adsorption model for the simulation of the adsorption behavior of mercury ions on AC from aqueous solutions. The AC has basic surface functional groups is beneficial for the adsorption of mercury ions fTom aqueous solutions. These results can be used for the selection of adsorbents for the removal of high metal ions from industrial waste water.

关 键 词：活性炭 重金属离子去除 汞离子 

分 类 号：TQ424.1[化学工程]