Journal of Science and Technology

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https://oerrepository.ntt.edu.vn/handle/298300331/3

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  • Hình ảnh thu nhỏ
    Tài liệu
    Enhanced adsorption of methylene blue onto graphene oxide-doped XFe2O4 (X 5Co, Mn, Ni) nanocomposites: kinetic, isothermal, thermodynamicand recyclability studies
    (Trường Đại học Nguyễn Tất Thành (Tạp chí Khoa học công nghệ NTT), 2017-10-30) Bach, Long Giang; Tran, Van Thuan; Nguyen, Duy Trinh; Pham, Van Thinh; Do, Sy Trung
    Abstract The nanocomposites XFe2O4/GO with various metal sites (X = Co, Mn, and Ni) were successfully synthesized via the polymerized complex method. The XFe2O4/GO family was characterized using X-Ray diffraction analysis, scanning electron microscopy (SEM), and a vibrating sample magnetometer. We also investigated the effect of three fundamental parameters (initial concentration, dosage, and pH) on the removal of methylene blue using the response surface methodology. A high F value, very low P value (\ 0.00001), a non-significant lack of fit, and the determination coefficient (R2 [ 0.95) demonstrated a strong corre- lation between experimental and predicted values of the responses. The predicted optimal conditions for maximum removal efficiency were easily determined to adhere to the following trend for actual test experiments: MnFe2O4/GO (60.1%) \ CoFe2O4/GO (80.3%) \ NiFe2O4/GO (87.7%).
  • Hình ảnh thu nhỏ
    Tài liệu
    High Photocatalytic Activity of Oliver-Like BiVO4 for Rhodamine B Degradation under Visible Light Irradiation
    (Trường Đại học Nguyễn Tất Thành, 2018-02-01) Nguyen, Huu Vinh; Tran, Van Thuan; Do, Sy Trung; Nguyen, Duy Trinh
    Report the facial synthesis of BiVO4 crystals with different morphologies by the solvothermal and hydrothermal process. The phase structure and morphology as-synthesized samples were characterized by XRD, FE-SEM, and UV-vis DRS spectroscopy. We also investigated the photocatalytic activity of BiVO4 for the decomposition of rhodamine B (RhB) under visible light irradiation. The results showed that oliver-like BiVO4 was obtained when using the mixed solvent of ethylene glycol and water while starflower-like BiVO4 was obtained using the mixed solvent of ethylene glycol monomethyl ether and water. The hydrothermal evolution process the BiVO4 product with a rod-like morphology. Oliver-like BiVO4 with pure monoclinic scheelite phase and high specific surface area exhibits efficient photodegradation of RhB (k = 7.82x10-3 min-1).