Microwave-Assisted Solvothermal Synthesis and Photocatalytic Activity of Bismuth(III) Based Metal–Organic Framework

• Published in: Topics in catalysis Vol. 63; no. 11-14; pp. 1109 - 1120
• Main Authors: Nguyen, Vinh Huu, Nguyen, Trinh Duy, Van Nguyen, Tuyen
• Format: Journal Article
• Language: English
• Published: New York Springer US 01.10.2020; Springer Nature B.V
• Subjects: Bismuth; Catalysis; Catalytic activity; Characterization and Evaluation of Materials; Chemistry; Chemistry and Materials Science; Crystal defects; Crystal structure; Crystallization; Gravimetric analysis; Heterogeneous structure; Homogeneity; Industrial Chemistry/Chemical Engineering; Infrared analysis; Infrared spectroscopy; Lamellar structure; Metal-organic frameworks; Morphology; Original Paper; Pharmacy; Photocatalysis; Photoelectrons; Photoluminescence; Physical Chemistry; Rhodamine; Spectrum analysis; Surface area; Surface stability; Synthesis; Terephthalate; Thermal analysis; Thermal stability; X ray photoelectron spectroscopy; X-ray diffraction; Rhodamine B degradation; Metal–organic framework; Microwave-assisted solvothermal method; Bismuth terephthalate; Solvothermal method
• ISSN: 1022-5528; 1572-9028
• DOI: 10.1007/s11244-020-01271-6

This study aims to synthesize and evaluate the photocatalytic activity of bismuth terephthalate material (Bi-BDC) synthesized by solvothermal (ST) and microwave-assisted solvothermal (MW) methods. Differences in the crystal structure and crystal shape were assessed by analytical methods such as X-ray diffraction (XRD), scanning electron microscope (SEM), Fourier transform infrared (FT-IR) spectrum, X-ray photoelectron spectroscopy (XPS), N 2 adsorption/desorption, Raman spectrum, and thermal gravimetric analysis (TGA). From XRD, IR, Raman, and XPS results, the fully crystallized Bi-BDC materials were achieved regardless of the preparation router. Bi-BDC-MW exhibited spherical-like morphologies, producing between stacked lamellar, while Bi-BDC-ST method exhibited a heterogeneous structure. The TGA data indicated that Bi-BDC is thermally stable up to 300 °C, suggesting the excellent thermal stability of Bi-BDC. The surface area and pore volume of Bi-BDC-MW (18 m 2 /g and 85 × 10 −3 cm 3 /g) are higher than those of Bi-BDC-ST (16 m 2 /g and 52 × 10 −3 cm 3 /g), which is due to its well-defined lamellar microstructure and homogeneity of the crystals. Compared to Bi-BDC-ST, Bi-BDC-MW has a higher value in the content of oxygen vacancy. Moreover, the photocatalytic efficiency of Bi-BDC-MW was significantly higher than that of Bi-BDC-ST, in which 99.44% rhodamine B (RhB) is removed after 360 min of irradiation. The improved photocatalytic efficiency of Bi-BDC-MW is ascribed to the morphology, specific surface area, and oxygen defects, which exhibited the good separation of electrons and holes, as confirmed by the photoluminescence (PL). The results should open a new approach to enhancing the photocatalytic activity of bismuth terephthalate materials.