Two-dimensional nanosheets copper-based metal-organic framework (CuBDC) was synthesized by a simple distribution droplets method using Cu2+ as the metal ion and terephthalic acid (BDC) as the ligand.The CuBDC was immersed into acetic aqueous solutions with pH gradient respectively,and the appropriate acidity value promoted the dissolution and recrystallization process of the CuBDC crystal and thus produced another rod-shaped MOF (CuBDC-T),achieving morphology and structure invertible transformation of CuBDC.The composition,structure and morphology and the transformation process of two materials were studied by scanning electron microscope,Fourier transform infrared spectrometer,X-ray diffractometer and other characterization methods.The catalytic reaction activities of the two materials were investigated by CO2 cycloaddition reaction.The results showed that the difference of morphology between the two materials might be caused by the difference of nucleation rates and growth rates of the crystals.The yield of cyclic carbonate product reached 62% under the action of CuBDC at the reaction time of 4h.CuBDC nanosheets exhibited better catalytic performance compared with the rod-shaped CuBDC-T.
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基金资助
国家自然科学基金面上项目(22175030);宁夏自然科学基金(2022AAC03342)
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