Preparation and Performance Characterization of Flexible and Washable Zr-MOFs Composite Nanofiber Membrane
Received date: 2021-08-26
Online published: 2021-10-22
Supported by
National Natural Science Foundation of China(52170019); National Natural Science Foundation of China(51973015); Fundamental Research Funds for the Central Universities(06500100); Fundamental Research Funds for the Central Universities(FRF-TP-19-046AIZ)
Flexible high adsorption materials play a key role in many fields such as wastewater and exhaust gas treatment, protective clothing manufacturing, toxic and harmful substance monitoring. In situ growth of NO2-UiO-66 on electrostatic spun nanofiber was obtained by aqueous synthesis using trifluoroacetic acid as regulator, and water as solvent. The effects of different ratio of trifluoroacetic acid (TFA)/deionized water, different metal salt and ligand proportions and hydrothermal growth time on NO2-UiO-66 morphology and load effects were studied. The add content of TFA was φTFA=30%, the molar ratio of metal salt and the ligand was 1∶1.5, and the hydrothermal growth time was maintained at 4 h, which proved to be the optimal synthetic conditions. The specific synthesis procedure of the NO2-UiO-66@polyacrylonitrile composite nanofiber membrane (NO2-UiO-66@PAN NM) was as follows: First, 10% (w) of PAN spinning liquid was woven into nanofiber membrane using the electrospinning method. Second, a solvent having a TFA content of 30% was prepared in a sealed glass bottle, followed by addition of metal salt (ZrCl4) and organic ligand (2-nitroterephthalic acid, NO2-H2BDC). Finally, the PAN nanofiber was immersed in the precursor mixture, and after 30 min of ultrasonic treatment, it was placed in an oven at 100 ℃ for 4 h to obtain the NO2-UiO-66@PAN NM. The structure of NO2-UiO-66@PAN NM was characterized by scanning electron microscope (SEM), X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), thermogravimetry (TG) and nitrogen adsorption-desorption test. The characterization results showed that the NO2-UiO-66 were uniformly loaded on nanofibers. The load could reach 33.28%, the Brunner-Emmet-Teller measurements (BET) surface area was 504.16 m2/g, and the pore volume was 0.241 cm3/g. Further, the NO2-UiO-66@PAN nanofiber membrane still remained in the stability of the structure after being treated with high temperature (320 ℃), bending and washing with water, acid and alkali. Through the above characterization analysis, it was found that the NO2-UiO-66 loaded on the nanofibers, which enabled the membrane material excellent in physical and chemical stable properties, and has a large application potential under harsh conditions such as toxic and harmful.
Key words： electrospinning; nanofiber; metal-organic framework; NO2-UiO-66; aqueous synthesis
Xiaoke Hao , Zhenyu Zhai , Yaxin Sun , Congju Li . Preparation and Performance Characterization of Flexible and Washable Zr-MOFs Composite Nanofiber Membrane[J]. Acta Chimica Sinica, 2022 , 80(1) : 49 -55 . DOI: 10.6023/A21080402
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