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<p>Herein, we report the synthesis of a new anionic metal-organic framework (MOF), [(CH<sub>3</sub>)<sub>2</sub>NH<sub>2</sub>][In(CDIP)]-DMF(<b>1</b>, H<sub>4</sub>CDIP=5,5′-carbonyldiisophthalic acid). Compound <b>1</b> is constructed from [In(COO)<sub>4</sub>]<sup>−</sup> secondary building units and features a high density of carbonyl functional groups uniformly distributed along the pore surfaces. Benefiting from its anionic framework and functionalized pores, compound <b>1</b> exhibits exceptional adsorption performance toward cationic dyes. It achieves a Methylene blue (MLB) removal efficiency of 99.4% within 3 min and an ultrahigh adsorption capacity of 722 mg/g, surpassing most reported indium-based MOFs. Furthermore, compound <b>1</b> shows substantial adsorption capacities for larger carcinogenic dyes, including Basic Red 9 (BR9, 119 mg/g) and Basic Violet 14 (BV14, 148 mg/g). Efficient and selective adsorption of these dyes is also realized in mixed-charge dye systems. Kinetic and isotherm analyses reveal that the adsorption process follows a pseudo-second-order kinetic model and fits well with the Langmuir isotherm, indicating monolayer chemisorption. Notably, after three adsorption-desorption cycles, the dye removal efficiency remains above 83%, demonstrating good recyclability. These results highlight compound <b>1</b> as a promising adsorbent for the selective removal and separation of cationic dyes from wastewater.</p>

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Carbonyl-functionalized Anionic Indium MOF for Highly Selective Adsorption of Cationic Dyes

  • 期刊论文

  • 发表日期：

    2026年5月12日

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  • Chen Chen,
  • Yuheng Li,
  • Xiaofei Zhu,
  • Xiaolong Luo

摘要

Herein, we report the synthesis of a new anionic metal-organic framework (MOF), [(CH3)2NH2][In(CDIP)]-DMF(1, H4CDIP=5,5′-carbonyldiisophthalic acid). Compound 1 is constructed from [In(COO)4]− secondary building units and features a high density of carbonyl functional groups uniformly distributed along the pore surfaces. Benefiting from its anionic framework and functionalized pores, compound 1 exhibits exceptional adsorption performance toward cationic dyes. It achieves a Methylene blue (MLB) removal efficiency of 99.4% within 3 min and an ultrahigh adsorption capacity of 722 mg/g, surpassing most reported indium-based MOFs. Furthermore, compound 1 shows substantial adsorption capacities for larger carcinogenic dyes, including Basic Red 9 (BR9, 119 mg/g) and Basic Violet 14 (BV14, 148 mg/g). Efficient and selective adsorption of these dyes is also realized in mixed-charge dye systems. Kinetic and isotherm analyses reveal that the adsorption process follows a pseudo-second-order kinetic model and fits well with the Langmuir isotherm, indicating monolayer chemisorption. Notably, after three adsorption-desorption cycles, the dye removal efficiency remains above 83%, demonstrating good recyclability. These results highlight compound 1 as a promising adsorbent for the selective removal and separation of cationic dyes from wastewater.