Synthesis of N,O-rich active site porous polymers and their efficient recovery of Gd(Ⅲ) from solution  

作　　者：Bin Xiao Lijinhong Huang Jiacai Ou Bin Zeng Zhiqiang Zou Xiangrong Zeng Wanfu Huang 

机构地区：[1]School of Resource and Environmental Engineering,Jiangxi University of Science and Technology,Ganzhou 341000,China [2]School of Resources and Architectural Engineering,Gannan 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

出　　处：《Journal of Rare Earths》2023年第9期1419-1428,I0006,共11页稀土学报（英文版）

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

摘　　要：Our previous study found that the adsorption performance of porous carbon for Gd(Ⅲ) could be significantly improved by increasing the N,and O functional groups on its surface.Unfortunately,the adsorption capacity of porous carbon is low due to the limited number of N,and O functional groups that can be loaded on its surface.Due to the advantage of customizable functional groups of porous organic polymers(POPs),the triazine-based Tb-MEL and hydroxyl-modified triazine-based Tp-MEL were synthesized by a one-step hydrothermal method using nitrogen-rich melamine as the raw material and triformylbenzene(Tb) and 2,4,6-triformylphloroglucinol(Tp),respectively.The Gd(Ⅲ) adsorption isotherms and kinetic curves of Tb-MEL,and Tp-MEL at pH=6 and T=25℃ are in high agreement with the Langmuir isotherm(R^(2)>0.998) and pseudo-second-order kinetics(R^(2)>0.993),respectively.The fitted maximum adsorption capacity(q_(max)) is about 136.05 mg/g,much higher than 58.38 mg/g of Tb-MEL.The adsorption efficiency for Gd(Ⅲ) at pH=7 is close to 100%,and Tp-MEL maintains 62.4% of the initial adsorption capacity after ten cycle s of sorption/desorption of Gd(Ⅲ),with an average elution efficiency of more than 90%.Adsorption selection performance tests show that Tp-MEL has good adsorption selectivity for HREE ions,and the selectivity is as follows:Lu^(3+)>Y^(3+)>Gd^(3+)>Nd^(3+)>La^(3+)>Al^(3+)>Ca^(2+)>Mg^(2+).Batch adsorption,Brunauer-Emmett-Teller(BET) method,and X-ray photoelectron spectrometer(XPS)tests show that hydroxyl modifications lose the specific surface area of the polymer,and the functional groups contribute more to the adsorption performance than the specific surface area.

关 键 词：N O functional groups Triazine-based Hydroxyl-modified Adsorption performance Rare earths 

分 类 号：TF845[冶金工程—有色金属冶金] TQ424[化学工程]