高岭石对铅离子吸附性能的特征研究  

Studies on Characteristics of Pb^(2+) Adsorption to Kaolinite

作　　者：何翊[1] 牛盾[1] 门阅[1] 

机构地区：[1]东北大学

出　　处：《金属矿山》2005年第10期60-64,共5页Metal Mine

摘　　要：研究了高岭石吸附水体中铅离子的热力学和动力学特征,并探讨了高岭石表面对铅的吸附模式。结果表明:其动力学行为遵循Bangharm方程和E lovich方程,但与E lovich方程更吻合;热力学行为遵循Langmu ir方程和Freund lich方程,但与Langmu ir方程更吻合,反映出Pb2+在实验浓度范围内是呈单分子层在高岭石上发生吸附且具有较大的吸附容量。随着pH的升高,高岭石对Pb2+的吸附量增加。吸附铅的表面化合态有两种:SOH和SOPbOH。The characteristics of the thermodynamics and kinetics of in-water Pb^2＋ adsorption to kaolinite and the adsorption mode of Pb^2＋ on the surface of kaolinite were studied. The results showed that its kinetic behavior follows both Bangharm and Elovich equations, but more conforms to the later. Its thermodynamic behavior follows both Langmuir and Freudlich equations, but more conforms to the former. It is indicated that, in the test concentration range, Pb^2＋ is adsorped on kaolinite in single molecule layer and kaolinite has a large adsorption capacity for Pb^2＋ , which increases with the rise of pH value. There are two surface eomplexation modes of Pb^2＋ adsorption on kaolinite ： 〉SOH and 〉SOPbOH .

关 键 词：高岭土 铅离子 吸附 表面络合 吸附性能 高岭石 Elovich方程 LANGMUIR方程 特征研究 FREUNDLICH方程 

分 类 号：X703[环境科学与工程—环境工程] TQ424.1[化学工程]