Chemical Research in Chinese Universities ›› 2015, Vol. 31 ›› Issue (6): 899-903.doi: 10.1007/s40242-015-5237-5

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Ionic Liquid-assisted Formation of Lanthanide Metal-organic Framework Nano/Microrods for Superefficient Removal of Congo Red

XIAO Yi1, CHEN Fang1, ZHU Xixi1, QIN Hongling1, HUANG Hongmei1, ZHANG Youyu1, YIN Dulin1, HE Xiaoxiao2, WANG Kemin2   

  1. 1. Key Laboratory of Chemical Biology and Traditional Chinese Medicine Research, Ministry of Education, College of Chemistry and Chemical Engineering, Hunan Normal University, Changsha 410081, P. R. China;
    2. State Key Laboratory of Chemo/Biosensing and Chemometrics, College of Chemistry andChemical Engineering, College of Biology, Hunan University, Changsha 410082, P. R. China
  • Received:2015-06-15 Revised:2015-08-15 Online:2015-11-01 Published:2015-09-02
  • Contact: HUANG Hongmei, WANG Kemin E-mail:huanghongmei@hunnu.edu.cn;kmwang@hnu.edu.cn
  • Supported by:

    Supported by the National Natural Science Foundation of China(No.21475042), the Scientific Research Fund of Hunan Provincial Education Department, China(No.12B077), the Open Fund Project of State Key Laboratory of Chemo/Biosensing and Chemometrics in Hunan University, China(No.201103) and the Program for Science and Technology Innovative Research Team in Higher Educational Institutions of Hunan Province, China.

Abstract:

New lanthanide metal-organic framework(MOF) nano/microrods, [C4mim]Cl-Eu-MOF, [C8mim]Cl-Eu- MOF and [C12mim]Cl-Eu-MOF, were conveniently synthesized via an ionic liquid-assisted hydrothermal method and characterized by means of powder X-ray diffraction(XRD), Fourier transform infrared spectroscopy(FTIR), thermogravimetric analysis(TG) and transmission electron microscopy(TEM). The obtained nano/microrods with low surface areas were efficient for the removal of Congo red(CR) from aqueous solutions. Under the optimum conditions, [C4mim]Cl-Eu-MOF with a specific surface area of 5.1 m2/g exhibited an ultrahigh adsorption capacity of 2606 mg/g toward CR. Notably, the adsorption efficiency of [C4mim]Cl-Eu-MOF for CR via nano/microscale stacking can be directly demonstrated by TEM. In-depth understanding of CR removal by [C4mim]Cl-Eu-MOF nano/microrods was also supported by FTIR, Raman spectroscopy and zeta potential analyses.

Key words: Lanthanide metal-organic framework, Nano/microrod, Ionic liquid, Congo red, Adsorption