铁锰氧化物对稀土离子的吸附行为研究  

Adsorption Behavior of Rare Earth Ions by Fe-Mn Binary Oxides

作　　者：张臻悦[1,2] 李丹 池汝安[1,2] 龙菲[1,2] 冉雨荷 王宏博 ZHANG Zhen-yue;LI Dan;CHI Ru-an;LONG Fei;RAN Yu-he;WANG Hong-bo(School of Resources and Safety Engineering,Wuhan Institute of Technology,Wuhan 430073,China;Key Laboratory for Green Chemical Process of Ministry of Education,Wuhan 430073,China)

机构地区：[1]武汉工程大学资源与安全工程学院,湖北武汉430073 [2]绿色化工过程教育部重点实验室,湖北武汉430073

出　　处：《稀土》2023年第4期163-176,I0006,共15页Chinese Rare Earths

基　　金：国家自然科学基金项目(92162109,52074195,52222405)。

摘　　要：采用化学共沉淀法制备铁锰复合氧化物作吸附剂,通过静态和动态吸附实验探究了不同吸附条件对铁锰氧化物吸附稀土离子的影响,对铁锰氧化物吸附稀土离子过程进行了等温吸附模型拟合和吸附动力学、吸附活化能分析,探究了稀土离子在铁锰氧化物上的吸附机理。结果表明,稀土离子在铁锰氧化物上的吸附过程符合Langmuir等温吸附模型;稀土离子在铁锰氧化物上的吸附过程符合准二级动力学模型,属于单层均匀的化学吸附过程,吸附速率控制步骤由化学吸附决定,且温度对吸附动力学影响程度最大;吸附热力学分析表明铁锰氧化物吸附稀土离子是吸热的化学吸附过程,吸附活化能分别为E_(La)^(3+)=11.04 kJ/mol、E_(Gd)^(3+)=16.85 kJ/mol和E_(Y)^(3+)=16.67 kJ/mol;稀土离子与铁锰氧化物上的羟基发生了交换形成了内层络合物,稀土离子取代表面羟基是主要的吸附机制。Fe-Mn binary oxides were prepared by chemical coprecipitation method as adsorbent.The effects of different adsorption conditions on the adsorption of rare earth ions by Fe-Mn binary oxide were explored through static and dynamic ad-sorption experiments.The isothermal adsorption model fitting and adsorption kinetics and activation energy analysis of the ad-sorption process of Fe-Mn oxides were carried out to explore the adsorption mechanism of rare earth ions on Fe-Mn oxides.The results show that the adsorption process of rare earth ions on Fe-Mn binary oxides conforms to Langmuir isothermal adsorption model.The adsorption process of rare earth ions on Fe-Mn binary oxides conforms to the quasi second-order kinetic model,be-longing to a single homogeneous chemical adsorption process,the adsorption rate control step is determined by chemical ad-sorption,and the temperature has the greatest effect on the adsorption kinetics.The adsorption thermodynamic analysis showed that the adsorption of rare earth ions by Fe-Mn binary oxides was endothermic spontaneous reaction,and the adsorption activa-tion energies were E_(La)^(3+)=11.04 kJ/mol,E_(Gd)^(3+)=16.85 kJ/mol and E_(Y)^(3+)=16.67 kJ/mol,respetively.The exchange f ae earth ions with hydroxyl groups on Fe-Mn binary oxides formed the inner complex,and the substitution of surface hydroxyl groups by rare earth ions was the main adsorption mechanism.

关 键 词：铁锰氧化物 稀土离子 吸附 

分 类 号：TF845[冶金工程—有色金属冶金]