竹活性炭吸附溶液中汞离子的试验研究  

Adsorption of mercury ion from aqueous solutions by activated bamboo carbon

作　　者：谢新苹[1] 蒋剑春[1,2] 孙康[1,2] 卢辛成[1] 王金表[1] 

机构地区：[1]中国林业科学研究院林产化学工业研究所,南京210042 [2]中国林业科学研究院林业新技术研究所,北京100091

出　　处：《化工新型材料》2014年第7期123-125,共3页New Chemical Materials

基　　金：中央级公益性科研院所基本科研业务费专项资金(CAFINT2013C02);国家科技支撑计划项目(2012BAD30B03);烟气脱汞用活性炭的结构调控与掺杂改性机制研究(BK2012514)

摘　　要：利用竹活性炭吸附去除溶液中的汞离子,考察了溶液pH值、汞离子初始浓度、活性炭投加量和吸附温度对竹活性炭吸附汞离子的影响,研究了竹活性炭吸附溶液中汞离子的吸附动力学行为。结果表明:竹活性炭吸附溶液中汞离子是一个吸附与解吸并存的物理吸附过程,20℃下竹活性炭的除汞效率明显高于80℃,是放热反应,低温利于吸附;溶液pH值是影响竹活性炭吸附汞离子的最重要因素,酸性环境可明显提高活性炭的除汞效率;活性炭的微孔和小中孔是汞离子的主要吸附位,平均孔径为2nm的竹活性炭除汞效率能够达到99%以上。竹活性炭对汞离子的吸附动力学行为遵循准二级动力学方程,相关系数高于0.99。Adsorption method using activated carbon was investigated for removal of mercury ion from aqueous solutions. The influence of p H value,initial concentration of mercury ion,dosage of activated carbon and adsorption temperature on adsorption properties of the activated carbon were studied. Kinetics of adsorption were also investigated. Results showed that it was a physical adsorption process with the coexistence of adsorption and desorption. The removal efficiency of mercury ion at 20℃ was much higher than that of 80℃. It was an exothermic reaction, and adsorption was performed well at low temperature, pH value was the most important factor that influenced adsorption properties of the activated carbon. Acidic environment could obviously improve the mercury removal efficiency. Mieropores and little mesopores in the ac- tivated carbon were the main adsorption sites for mercury ion. Mercury removal efficiency of the activated carbon with an average pore diameter of 2nm reached 99%. It was also found that the adsorption kinetics were satisfied with pseudo-sec- ond-order kinetics equation, whose correlation was higher than 0.99.

关 键 词：竹活性炭 汞离子 吸附 除汞效率 吸附动力学 

分 类 号：O647.3[理学—物理化学]