高岭土和蒙脱石的混合土对Cu2+的吸附特性

摘要

The isothermal adsorption characteristics of Cu2 + onto kaolinite,montmorillonite and the mixed soil of two mineral is mainly studied,the effects of initial concentration and mineral ratio are focused on.Some isothermal adsorption experiments were conducted,the adsorption isotherm density qe of Cu2+ onto single mineral and mineral mixture is acquired,and the changes of this two kinds of mineral adsorption properties are analyzed and compared.The study results indicate,kaolinite and montmorillonite on Cu2+ adsorption isotherm belong to curve "C" and "H";the adsorption properties of mixed minerals of Cu2+ is dominated by montmorillonite;the adsorption isotherm density qe of mixed minerals will linear decrease as the montmorillonite ratio increases.It is compared with single mineral adsorption,mineral mixture can cause "adsorption loss" mixing deviation coefficient Km ＜ 1,and as a polynomial function about kaolinite (or montmorillonite).%研究了高岭土、蒙脱石和同时包含上述两种矿物的混合土对水溶液中Cu2+的等温吸附特性,重点考察了初始浓度和矿物配比等因素的影响.通过平衡吸附试验得到单种矿物,以及混合矿物对Cu2+的平衡吸附量qe,分析并比较混合前后两种矿物吸附性能的变化情况.结果表明,高岭土与蒙脱石对Cu2+等温吸附曲线分别属于“C型”和“H型”;混合矿物对Cu2+的吸附性能由蒙脱石主导;混合矿物的平衡吸附量ge随高岭土占比的增加而线性减小;与单独矿物吸附相比,矿物混合会造成“吸附量损失”混合偏差系数Km＜l,且为关于高岭土(或蒙脱石)含量的多项式函数.