Water-stabilized Cd4 cluster-based metal-organic framework with pyrrolo-pyrrole-based linker for fast efficient organic dye adsorption and highly selective detection of Fe3+ and Cr(VI) in water

IF 4.9 2区化学 Q2 CHEMISTRY, PHYSICAL

Colloids and Surfaces A: Physicochemical and Engineering Aspects Pub Date : 2025-06-13 DOI:10.1016/j.colsurfa.2025.137491

Meng-Qiang Deng , Xin Chen , Xiao-Shuai Ma , Huan Zhang , Peng Li , Wei Gao , Ji-Yang Li , Xiu-Mei Zhang

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引用次数: 0

Abstract

Water-stabilized ionic metal-organic frameworks (MOFs) have developed some promising areas such as dye adsorption and ions detection. Here, a new multifunctional ionic MOF [(CH₃)₂NH₂)][Cd₄(PPTBA)₂(Cl)(H₂O)₄]·5 H₂O (Cd-MOF-1) (H₄PPTBA = 4,4′,4′′,4′′′-(pyrrolo[3,2-b]pyrrole-1,2,4,5-tetrayl) tetrabenzoic acid) was synthesized by solvothermal method. The structural analysis revealed that Cd-MOF-1 possessed a three-dimensional (3D) anionic framework in which the linear tetranuclear clusters were connected by PPTBA^4- ligands and its channels contained the (CH₃)₂NH₂⁺ cations, which can be exchanged by cationic dyes to realize the selective adsorption of cationic dyes. As a result, Cd-MOF-1 can efficiently adsorb the methylene blue (MB⁺) dyes in aqueous solution with a high adsorption capacity of about 329.8 mg·g⁻¹. Considering the practical application of Cd-MOF-1 as an adsorbent, a mixed matrix membrane of Cd-MOF-1/polyvinylidene fluoride (PVDF) was fabricated. This Cd-MOF-1/PVDF film inherited the performance of preferentially adsorbing the MB⁺ dyes, which also displayed excellent adsorption capacity of 328.1 mg·g⁻¹. In addition, Cd-MOF-1 presented the distinct quenching responses towards Fe³⁺, CrO₄^2- and Cr₂O₇^2- ions in water. The Stern-Volmer quenching constants were calculated as 2.32 × 10⁴, 5.2 × 10⁴ and 3.32 × 10⁴ M⁻¹, respectively, and the detection limits were 0.078, 0.052 and 0.073 µM, respectively. Remarkably, the fabricated Cd-MOF-1/PVDF film was applied as a portable device to realize the visual detection of Fe³⁺, CrO₄^2- and Cr₂O₇^2- ions. These experimental results indicated the prepared Cd-MOF-1 was highly promising for dye adsorption and ion detection in aqueous environment.

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基于水稳定Cd4簇的金属有机骨架与吡咯-吡咯基连接剂，用于快速高效的有机染料吸附和水中Fe3+和Cr（VI）的高选择性检测

水稳定离子金属有机框架（MOFs）在染料吸附和离子检测等方面有着广阔的应用前景。本文采用溶剂热法合成了一种新型多功能离子MOF [(CH3)2NH2)][Cd4(PPTBA)2(Cl)(H2O)4]·5 H2O (Cd-MOF-1) （H4PPTBA = 4,4 ',4 ',4 ' ' -（吡咯[3,2-b]吡咯-1,2,4,5-四基）四苯甲酸）。结构分析表明，Cd-MOF-1具有三维（3D）阴离子框架，其中线性四核簇由PPTBA4-配体连接，其通道含有（CH3）2NH2+阳离子，可被阳离子染料交换，实现阳离子染料的选择性吸附。结果表明，Cd-MOF-1能有效吸附亚甲基蓝（MB+）染料，吸附量约为329.8 mg·g−1。考虑到Cd-MOF-1作为吸附剂的实际应用，制备了Cd-MOF-1/聚偏氟乙烯（PVDF）混合基质膜。Cd-MOF-1/PVDF膜继承了优先吸附MB+染料的性能，吸附量达到了328.1 mg·g−1。此外，Cd-MOF-1对水中的Fe3+、CrO42-和Cr2O72-离子表现出明显的猝灭反应。计算得到Stern-Volmer猝灭常数分别为2.32 × 104、5.2 × 104和3.32 × 104 M−1，检出限分别为0.078、0.052和0.073 µM。值得注意的是，所制备的Cd-MOF-1/PVDF薄膜作为便携式器件，实现了对Fe3+、CrO42-和Cr2O72-离子的视觉检测。实验结果表明，所制备的Cd-MOF-1在水环境中具有良好的染料吸附和离子检测前景。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Colloids and Surfaces A: Physicochemical and Engineering Aspects 化学-物理化学

CiteScore

8.70

自引率

9.60%

发文量

2421

审稿时长

56 days

期刊介绍： Colloids and Surfaces A: Physicochemical and Engineering Aspects is an international journal devoted to the science underlying applications of colloids and interfacial phenomena. The journal aims at publishing high quality research papers featuring new materials or new insights into the role of colloid and interface science in (for example) food, energy, minerals processing, pharmaceuticals or the environment.