高炉水淬渣吸附Zn2＋的平衡与动力学研究  

Kinetic and equilibrium studies on the adsorption of Zn^(2+) from aqueous solution by water-quenched blast furnace slag( WBFS)

作　　者：王哲[1,3] 黄国和[1] 安春江[2] 陈莉荣[3] 刘金亮[3] 

机构地区：[1]华北电力大学能源与环境研究院、区域能源系统优化教育部重点实验室,北京102206 [2]能源、环境和可持续发展研究所、里贾纳大学,加拿大萨斯喀彻温省里贾纳S4S0A2 [3]内蒙古科技大学能源与环境学院,包头014010

出　　处：《环境科学学报》2015年第12期3838-3846,共9页Acta Scientiae Circumstantiae

基　　金：教育部重点项目(No.311013)~~

摘　　要：研究了Zn^(2+)在高炉水淬渣(WBFS)上的吸附情况,并用电镜扫描(SEM)、电感耦合等离子体质谱分析仪(ICP)及X射线衍射仪(XRD)等对高炉水淬渣的理化性质进行了表征.通过批量平衡实验,从动力学和热力学角度探讨了Zn^(2+)在高炉水淬渣上的吸附作用机理.结果表明:吸附等温线能较好地用Langmiur模型来描述,分离因子RL值介于0~1之间,属于优惠吸附.ΔH和ΔS值分别为52.45 k J·mol^(-1)和167.52J·mol^(-1)·K^(-1),表明Zn^(2+)在高炉水淬渣上的吸附是吸热过程,并且吸附过程增加了系统的混乱度,而ΔG值仅仅在温度高于318 K后才为负值,说明高炉水淬渣对Zn^(2+)吸附的自发性与温度成正比.吸附动力学很好地符合伪二级动力学模型,以化学吸附为主.高炉水淬渣重金属浸出浓度低,环境安全性能优良,可以作为一种较为理想的吸附剂.In this work, adsorption removal of Zn2＋ from aqueous solution by water-quenched blast furnace slag （ WBFS ） was investigated. The physicochemical properties of the slag were characterized by ICP, SEM and XRD. Batch experiments were carried out to test the mechanism, kinetics and thermodynamics of adsorption process of Zn2＋ on WBFS. The results showed that the experimental data yielded excellent fit with Langmiur model. The RL values were found between 0 and 1 for all concentrations, indicating a favorable adsorption of Zn2＋ on the WBFS. The enthalpy change （AH） and entropy change （AS） were 52.45 kJ.mo1-1 and 167.52 J. mol-1. K-1, respectively. The results showed that the adsorption of Zn2＋ onto WBFS was feasible, endothermic and the system disorder increased with duration. The negative △G values were obtained only at temperatures higher than 318 K for Zn2＋ adsorption. This indicated that the values of AG decreased with increasing temperature. The adsorption process was found to follow pseudo-second-order kinetic model and chemical adsorption was the main adsorption process. The contents of metal element in the eluate of WBFS were low, indicating WBFS an ideal choice for removing Zn2＋ from aqueous solution.

关 键 词：高炉水淬渣 锌 等温线 热力学 动力学 

分 类 号：X703[环境科学与工程—环境工程]