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Improving Photocatalytic Activity by Preparation of Magnetically Separable N-doped rGO/NiFe2O4@Ti-doped ZnOTernary Nanocomposite

Abdi, Zahra | 2021

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 54465 (07)
  4. University: Sharif University of Technology
  5. Department: Materials Science and Engineering
  6. Advisor(s): Nemati, Ali; Khachatourian, Adrine Malek
  7. Abstract:
  8. The N-doped rGO/NiFe2O4@Ti-doped ZnO as a novel ternary nanocomposite with magnetic recyclable was obtained by a facile and low-cost hydrothermal method. The structure, morphology, and optical as well as magnetic properties of synthesized nanocomposite were analyzed using the X-ray diffraction (XRD), Fourier-transform infrared spectra (FTIR), Raman spectroscopy, Emission scanning electron microscopy (FESEM) with Energy dispersive spectra, Transmission electron microscopy (TEM), UV-vis diffusive reflectance spectra, and Vibrating sample magnetometer (VSM). The photocatalytic activity was determined by the degradation of Methylene blue (MB) and Methylene orange (MO) dyes under visible light irradiation. The XRD and FTIR analyses confirmed that ternary nanocomposite was thoroughly synthesized. Furthermore, FESEM and TEM images indicated that NiFe2O4@Ti-doped ZnO nanospheres were embedded on N-doped rGO nanosheets. The band gap energies of pure ZnO, NiFe2O4@Ti-doped ZnO, and N-doped rGO/NiFe2O4@Ti-doped ZnO were calculated 3.19 eV, 2.44 eV, 1.88 eV via UV-vis spectra respectively. Thus, the band gap of ternary nanocomposite became narrow and exhibited better optical property. The result of the photocatalytic test showed 98% and 99% MB and MO degradation under 440 min visible light, respectively, in presence of N-doped rGO/NiFe2O4@Ti-doped ZnO nanocomposite. This appropriate photocatalytic performance of ternary nanocomposite under visible light was attained because of modifying the band gap energy and reducing the recombination of electron-hole pairs. In addition, this nanocomposite could be easily separated by applying an external magnetic field due to NiFe2O4 magnetic nanoparticles coupled with ZnO. The results show N-doped rGO/NiFe2O4@Ti-doped ZnO nanocomposite has efficient potential for removing dyes from wastewater
  9. Keywords:
  10. Magnetic Recyclability ; Nanocomposite ; Visible Light ; Photocatalytic Activity ; Dye Degradation ; Water Treatment

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