Highly efficient and targeted adsorption of Congo Red in a novel cationic copper-organic framework with three-dimensional cages

文献类型： 外文期刊

第一作者： Wang, Yenan

作者： Wang, Yenan;Ye, Jianqiu;Yang, Dejie;Li, Qinfen;Wu, Dongming;Zou, Yukun;Ren, Dong;Zhao, Jun;Wang, Yenan;Ren, Dong;Ye, Jianqiu;Li, Qinfen;Yang, Dejie;Wu, Dongming;Zou, Yukun;Wu, Dongming;Zhao, Jun

作者机构：

关键词： Congo red; Copper-organic framework; Specific-selectivity adsorption; Density functional theory; Two-dimensional correlation spectroscopy (2D COS)

期刊名称：SEPARATION AND PURIFICATION TECHNOLOGY （ 影响因子：8.6； 五年影响因子：7.8 ）

ISSN： 1383-5866

年卷期： 2024 年 329 卷

页码：

收录情况： SCI

摘要： Metal-organic frameworks (MOFs) with a three-dimensional (3D) caged structure and charged networks are promising adsorbents for separation and purification applications. However, it is a challenge to synthesize the MOFs in crystalline structures with a targeted ability of efficiently removing and reutilizing the individual diazo dye from sewage. Here, we report the synthesis of a novel copper-organic framework (Cu-MOF) with a 3D caged stucture and cationic networks using CuCl2 and a triazole ligand (methyl-1H-1,2,4-triazole-3-carboxylate MTC). The novel Cu-MOF exhibited highly efficient and targeted adsorption, separation and recovery characteristics for Congo Red (CR). Specifically, the maximal adsorption capacity was 119.76 mg & sdot;g(- 1), and the adsorbed CR can be efficiently released in NaCl-DMF solution with a recovery rate of almost 100%. After suffered from three adsorption-desorption cycles, the Cu-MOF could still reach a adsorption rate of >85% and maintain an intact skeleton structure. The batch-equilibrium experiment combined with density functional theory calculation further revealed that the adsorption process was spontaneous and exothermic, following the pseudo-secondorder kinetic equation with monolayer diffusion. The specific adsorption of Cu-MOF for CR was precisely generated through electronic interaction with the -NH2 and -SO3 groups, exhibiting the adsorption energies of -2.16 eV and -2.04 eV, respectively. The two-dimensional correlation spectroscopy analysis comfirmed that the energy distribution in CR adsorption was dominated by electrostatic interactions, followed by 7C-7C stacking and van der Waals interactions. In summary, our work not only presents a promising strategy for the targeted separation and purification of CR from wastewater, but also contributes to the design of highly efficient MOFadsorbents for other organic pollutants.

分类号：

  • 相关文献
作者其他论文 更多>>

微信小程序