Cu^(2+)、Pb^(2+)和Zn^(2+)离子在工业蛭石上的吸附行为研究  

Study on adsorption behavior of Cu^(2+),Pb^(2+) and Zn^(2+) cations on industrial vermiculite

作　　者：张宝述[1] 宋海明[1] 彭同江[2] 孙红娟[2] 刘文霞[1] 

机构地区：[1]西南科技大学先进建筑材料四川省重点实验室,四川绵阳621010 [2]西南科技大学矿物材料及应用研究所,四川绵阳621010

出　　处：《中国矿业》2007年第10期106-109,113,共5页China Mining Magazine

基　　金：国家自然科学基金(40502008);四川省应用基础研究项目(05JY029-008)

摘　　要：本研究通过工业蛭石在水溶液中对Cu2+、Pb2+、Zn2+的等温吸附实验,分析了蛭石对三种金属离子的吸附性能和机理;探讨了浓度对蛭石吸附量和吸附率的影响以及吸附等温方程的类型。实验结果表明,蛭石对三种金属离子具有很高的吸附容量;在低浓度时,三种离子在蛭石上的吸附机理主要以离子交换为主,且吸附量大小次序为Pb2+>Cu2+>Zn2+,吸附等温方程既符合Langmuir型,也符合Freundlich型;在高浓度时,离子交换和物理吸附同时发生,且吸附量大小次序为Zn2+>Pb2+>Cu2+,蛭石对Cu2+和Pb2+的吸附基本符合Langmuir型和Freundlich型,而蛭石对Zn2+的吸附,既不符合Langmuir型,也不符合Freundlich型。The research focus on the isothermal adsorption of Cu^2＋ , Pb^2＋ and Zn^2＋ on vermiculite in aqueous solution. Analyzing the adsorbent capacity of vermiculite for three kinds of metal cations and the influence of metal concentration for adsorbent capacity and velocity, and the type of adsorption isotherm equation were also discussed. The results showed that the adsorbent capacity of vermiculite for those cations is high; On light concentration condition, the adsorbent mechanism of those cations on vermiculite is ion exchange and adsorbent capacity followed Pb^2＋〉Cu^2＋〉Zn^2＋ , and adsorption isotherm equation not only accord with Langmuir type, but also cohere with Freundlich type; But on high concentration condition, ion exchange and physical adsorption are concomitance and adsorbent capacity followed Zn^2＋〉 Pb^2＋〉 Cu^2＋ , and the type of adsorption isotherm equation of Cu^2＋ and Pb^2＋ to meet Langmuir type and Freundlich type simultaneity, but Zn^2＋ neither Langmuir type nor Freundlich type.

关 键 词：蛭石 溶液浓度 等温吸附 

分 类 号：P579[天文地球—矿物学]