Efficient and selective recovery of Gd(Ⅲ)via polyethyleneimine modification of lanthanum-based metal-organic frameworks  

作　　者：Wenhao Li Lijinhong Huang Bin Xiao Xiaoguang Duan Haike Li Lang Li Wanfu Huang 

机构地区：[1]Ganzhou Key Laboratory of Basin Pollution Simulation and Control,Jiangxi University of Science and Technology,Ganzhou,341000,China [2]Innovation Center for Water Quality Security Technology at Ganjiang River Basin,Jiangxi University of Science and Technology,Ganzhou,341000,China [3]Faculty of Science and Engineering,WA School of Mines:Minerals,Energy and Chemical Engineering,Curtin University,WA,Australia [4]School of Architecture and Design,Jiangxi University of Science and Technology,Ganzhou,341000,China [5]School of Resources and Architectural Engineering,Gannan University of Science and Technology,Ganzhou,341000,China [6]School of Chemical Engineering and Advanced Materials,The University of Adelaide,Adelaide,SA5005,Australia [7]School of Resource and Environmental Engineering,Jiangxi University of Science and Technology,Ganzhou,341000,China

出　　处：《Journal of Rare Earths》2024年第1期210-219,I0007,共11页稀土学报（英文版）

基　　金：Project supported by the National Natural Science Foundation of China(41662004)。

摘　　要：With the development of the economy and the increasing demand for environmental protection,the efficient and selective recovery of Gd(Ⅲ)from actual wastewater is of critical importance.In this work,lanthanum-based metal-organic framework(LaBDC)materials were prepared by a hydrothermal method,and then polyethyleneimine(PEI)and LaBDC were combined by an impregnation method to form a novel LaBDC@xPEI composite.The prepared materials were characterized using Fourier transfo rm infrared spectroscopy(FTIR),X-ray diffraction(XRD),scanning electron microscopy(SEM),energy dispersive X-ray spectroscopy(EDX),B runauer-Emmett-Teller(BET),thermogravimetric analysis(TGA)and X-ray photoelectron spectroscopy(XPS).Experiments show that LaBDC@50%PEI has the highest adsorption capacity(181.77 mg/g)among lanthanum-based MOFs with different PEI loadings at pH=5.5,which is about 5.1 times that of bare LaBDC.The adsorption isotherm analysis shows that LaBDC@50%PEI follows the Langmuir model.In addition,the adsorption kinetics of LaBDC@50%PEI follows a pseudo-second-order kinetic model,indicating that the adsorption process is chemical adsorption.It is worth noting that LaBDC@50%PEI maintains good adsorption performance and stability after three recycling tests,and exhibits excellent selectivity in cation interference experiments.Overall,the LaBDC@50%PEI composites possess good stability and hold great promises in rapid recovery of Gd(Ⅲ)from practical aqueous environments.

关 键 词：Wet-impregnation method Polyethylene imine Metaleorganic frameworks LANTHANUM Recovery of Gd(Ⅲ) Rare earths 

分 类 号：X703[环境科学与工程—环境工程] TF845[冶金工程—有色金属冶金]