Behavior and mechanism of graphene oxide-tris(4-aminophenyl)amine composites in adsorption of rare earth elements  

作　　者：Xiaoru Zhao Xinyu Jiang Dongming Peng Jie Teng Jingang Yu 

机构地区：[1]College of Chemistry and Chemical Engineering,Central South University,Changsha 410083,China [2]School of Pharmacy,Hunan University of Chinese Medicine,Changsha 410208,China [3]College of Materials Science and Engineering,Hunan University,Changsha 410082,China

出　　处：《Journal of Rare Earths》2021年第1期90-97,I0004,共9页稀土学报（英文版）

基　　金：Project supported by National Natural Science Foundation of China(51674292);Fundamental Research Funds for the Central Universities of Central South University(2019zzts434)。

摘　　要：Three-dimensional(3D)graphene oxide-tris(4-aminophenyl)amine(GO-TAPAx:y)composites with different GO-to-TAPA mass ratios(x:y)were prepared by a facile one-step ultrasonic treatment.GOTAPAx:y composites were characterized by scanning electron microscopy(SEM),nitrogen(N2)adsorption-desorption isotherms,Fourier transform infrared spectroscopy(FTIR),X-ray photoelectron spectroscopy(XPS)and thermogravimetric analysis(TGA).Behavior and mechanism of GO-TAPAx:yco mposites for the adsorption of rare earth elements(REEs)were investigated.The adso rption capacities of GO-TAPA1;2 composite for Yb^3+,Er^3+,Nd^3+,La^3+and Y^3+are 30.88,26.52,20.60,11.24 and 10.52 mg/g,respectively.Effects of some important parameters including GO-to-TAPA mass ratios,contact time,reaction temperature and initial Yb^3+concentration on the adsorption were evaluated in detail.FTIR spectral and XPS analyses show that the metal complexations and ion exchanges between nitrogen/oxygen-containing species of the adsorbents and REEs are involved in the adsorption procedure besides the conventional adsorption based on specific surface area,indicating the introduction of specific molecules onto GO is beneficial to its adsorption ability.The convenient reusability and applicability of GO-TAPAx:y composites toward real samples also demonstrate their feasibility in the enrichment of REE ions.

关 键 词：Graphene oxide Tris(4-aminophenyl)amine ENRICHMENT Adsorption mechanism Rare earth elements 

分 类 号：TQ424[化学工程]