Chemical Research in Chinese Universities ›› 2026, Vol. 42 ›› Issue (3): 963-970.doi: 10.1007/s40242-026-6028-x

• Research Articles • Previous Articles     Next Articles

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

CHEN Chen, LI Yuheng, ZHU Xiaofei, LUO Xiaolong   

  1. College of Chemistry and Life Sciences, Advanced Institute of Materials Science, Changchun University of Technology, Changchun, 130012, P. R. China
  • Received:2026-01-23 Accepted:2026-04-01 Published:2026-06-02
  • Contact: ZHU Xiaofei,E-mail:zhuxiaofei@ccut.edu.cn;LUO Xiaolong,E-mail:lluoxiaolong@ccut.edu.cn E-mail:zhuxiaofei@ccut.edu.cn;lluoxiaolong@ccut.edu.cn
  • Supported by:
    This work was supported by the Natural Science Foundation of Jilin Province, China (No. YDZJ202401339ZYTS).

Abstract: 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.

Key words: Metal-organic framework, Carbonyl functional group, Dye absorption and separation