Chem. J. Chinese Universities ›› 2026, Vol. 47 ›› Issue (7): 20260039.doi: 10.7503/cjcu20260039

• Articles: Inorganic Chemistry • Previous Articles     Next Articles

Preparation of Ligand-functionalized MIL-101(Fe) MOFs and Their Photocatalytic Performance for CO2 Reduction

LI Xin, LV Ze, ZHONG Yi, XU Hong, MAO Zhiping, ZHANG Linping()   

  1. Key Laboratory of Sustainable Low?carbon Technologies for Textile Dyeing and Finishing,Ministry of Education,College of Chemistry and Chemical Engineering,Donghua University,Shanghai 201620,China
  • Received:2026-01-20 Online:2026-07-10 Published:2026-03-25
  • Contact: ZHANG Linping E-mail:zhang_lp@dhu.edu.cn
  • Supported by:
    the National Natural Science Foundation of China(21872025)

Abstract:

Solar-driven photocatalytic reduction of CO2 into high-value-added chemicals(e.g., formic acid, methanol) represents a cutting-edge strategy for mitigating the greenhouse effect and achieving carbon resource recycling. A series of ligand-functionalized X-MIL-101(Fe) MOFs catalytic materials was prepared by introducing functional groups such as —NH2, —OCH3, —Br and —NO2 by one-pot solvothermal method. The morphology, structure and optoelectronic properties of the catalysts were characterized by X-ray diffractometer(XRD), element analyzer(EA), scanning electron microscope(FE-SEM), ultraviolet-visible absorption spectroscopy(UV-Vis), photocurrent response spectroscopy(I-t), electrochemical impedance spectroscopy(EIS) and fluorescence emission spectroscopy(PL). The study demonstrates that the electronic properties of functional groups significantly modulate the light absorption, band structure, and charge carrier behavior of material: electron-donating groups(—NH2, —OCH3) enhance light response and promote charge separation; electron-withdrawing groups(—Br, —NO2) suppress light absorption and electron transfer. The —NH2 group exhibits a stronger electron-donating ability than the —OCH3 group bonded to the benzene ring. Consequently, under simulated sunlight, amino-modified NH2-MIL-101(Fe) demonstrated optimal photocatalytic performance for CO2 reduction, exhibiting the strongest photocurrent response and highest charge separation efficiency. In pure water, its formic acid production rate reached 28.13 µmol·g-1·h-1, which further increased to 42.61 µmol·g-1·h-1 with the addition of a sacrificial agent, representing a 3.45-fold improvement over unmodified MIL-101(Fe). The material also demonstrated excellent reusability, maintaining 93.92% of its activity after four cycles. This study provides theoretical foundations and experimental references for designing highly efficient and stable MOF-based CO2 photoreduction catalysts from the perspectives of the ligand structure.

Key words: Metal-organic framework, Ligand, Photocatalysis, Carbon dioxide reduction

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