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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

作者： Wang, Yenan 1 ; Ren, Dong 3 ; Ye, Jianqiu 1 ; Li, Qinfen 2 ; Yang, Dejie 1 ; Wu, Dongming 2 ; Zhao, Jun 4 ; Zou, Yukun 2 ;

作者机构： 1.Chinese Acad Trop Agr Sci, Coconut Res Inst, Wenchang 571339, Peoples R China

2.Chinese Acad Trop Agr Sci, Inst Environm & Plant Protect, Minist Key Lab Low carbon Green Agr Trop reg China, Haikou 571101, Peoples R China

3.China West Normal Univ, Coll Environm Sci & Engn, Nanchong 637009, Peoples R China

4.China Three Gorges Univ, Coll Mat & Chem Engn, Key Lab Inorgan Nonmet Crystalline & Energy Conver, Yichang 443002, Peoples R China

5.Natl Agr Expt Stn Agr Environm, Natl Observat & Res Stn, Trop Agroecosyst, Danzhou 571737, Peoples R China

6.4 Xueyuan Rd, Haikou 571101, Hainan, Peoples R China

7.8 Daxue Rd, Yichang 443002, Hubei, Peoples R China

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.

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