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

作　　者：陈燕 冯博[1,2] 吴吉昀[1] 张理军[1] 杨增烨 Chen Yan;Feng Bo;Wu Jiyun;Zhang Lijun;Yang Zengye(School of Resources and Environmental Engineering,Jiangxi University of Science and Technology,Ganzhou 341000,China;Collaborative Innovation Center for Development and Utilization of Rare Metal Resources Cosponsored by Ministry of Education and Jiangxi Province,Ganzhou 341000,China)

机构地区：[1]江西理工大学资源与环境工程学院,江西赣州341000 [2]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

出　　处：《中国稀土学报》2024年第4期762-770,I0004,共10页Journal of the Chinese Society of Rare Earths

基　　金：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)。

摘　　要：以碳酸钠(Na_(2)CO_(3))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p H、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p H值为6,投加量为1.5 g·L^(-1),30℃条件下,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。Sodium-modified vermiculite(Na-Ve)was prepared with Na_(2)CO_(3) 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,p H,temperature,and decreasing the initial concentration of solution.The La(Ⅲ)removal rate can reach 100%at the p H 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 

分 类 号：X703[环境科学与工程—环境工程]