钠化蛭石对镧(Ⅲ)的吸附行为及机制研究
Adsorption of Lanthanum(Ⅲ)by Sodium-Modified Vermiculite
陈燕 1冯博 1吴吉昀 2张理军 2杨增烨2
作者信息
- 1. 江西理工大学资源与环境工程学院,江西赣州 341000;稀有稀土资源开发与利用省部共建教育部协同创新中心,江西赣州 341000
- 2. 江西理工大学资源与环境工程学院,江西赣州 341000
- 折叠
摘要
以碳酸钠(Na2CO3)为改性剂制备了钠化蛭石(Na-Ve),利用扫描电镜(SEM)、能谱仪(EDS)、傅里叶变换红外光谱仪(FT-IR)、X射线衍射仪(XRD)等手段对Na-Ve进行了表征与分析,通过静态吸附实验研究了钠化蛭石对La(Ⅲ)的吸附行为.研究结果表明:Na-Ve维持了蛭石原有层状结构,平均孔径增大,对La(Ⅲ)的吸附容量较未改性蛭石有明显提升,最大吸附容量为37.7 mg·g-1;增加吸附剂用量、延长吸附时间、增大溶液pH、降低溶液初始浓度、升高温度都能提高Na-Ve对La(Ⅲ)的去除率,在pH值为6,投加量为1.5 g·L-1,30 ℃条件卜,La(Ⅲ)去除率可达100％;Na-Ve对La(Ⅲ)的吸附是可自发进行的吸热过程,遵循Langmuir吸附等温线,符合准二级动力学方程.
Abstract
Sodium-modified vermiculite(Na-Ve)was prepared with Na2CO3 solution as modifier.Na-Ve was characterized and analyzed by SEM,EDS,FT-IR,XRD,etc.The adsorption behavior of La(Ⅲ)by Na-Ve was studied by static adsorption experiment.The results show that Na-Ve maintains the lamellar structure of vermicu-lite,and the average pore size increases.The adsorption capacity of La(Ⅲ)by Na-Ve is significantly higher than unmodified vermiculite,with a maximum adsorption capacity of 37.7 mg·g-1.The removal rate of La(Ⅲ)by Na-Ve can been larged with increasing the dosage,adsorption time,pH,temperature,and decreasing the initial concentration of solution.The La(Ⅲ)removal rate can reach 100％at the pH value of 6,the dosage of 1.5 g·L-1 and 30 ℃.The adsorption of La(Ⅲ)by Na-Ve is a spontaneous endothermic process,which follows the Langmuir adsorption isotherm and accords with the quasi-second-order kinetic equation.
关键词
钠化蛭石/镧/吸附等温/热力学/动力学Key words
sodium-modified vermiculite/lanthanum/adsorption isotherm/thermodynamics/dynamics引用本文复制引用
基金项目
国家自然科学基金资助项目(52174248)
江西省双千计划资助项目(jxsq2019201115)
出版年
2024
NETL
NSTL
万方数据