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Solution-phase Synthesis of Zn-doped GaN Photocatalysts: Morphology, Composition, and Catalytic Activity towards Methylene Blue Degradation and 4-nitroaniline Conversion

Keerthi Senevirathne, Sanuja Pitigala, Shyamalee Ramaraj, Abdou Lachgar, Richard T. Williams

American Journal of Nanomaterials. 2017, 5(2), 43-50 doi:10.12691/ajn-5-2-1
  • Figure 1. XRD spectra of (a) Zn-doped Ga2O3 and their respective (b) oxynitride counterparts, as a function of percent Zn content. Vertical solid line pattern of Figure 1a is the calculated XRD reflections of -Ga2O3 phase. Inserts to Figure 1(a) and (b) show XRD patterns of Zn-doped Ga2O3 calcined at 850 °C in air and XRD of GaN and Zn-GaN, respectively
  • Figure 2. Scanning electron microscopic images of Zn-doped Ga2O3 rods (a), ovals (b), and spheres (c) and their corresponding Zn-doped GaN counterparts. The insets in the upper panel show corresponding high magnification images
  • Figure 3. A representative N2 adsorption-desorption isotherms of 4% Zn-doped Ga2O3 and Zn-doped GaN
  • Figure 4. Relative absorption calculated via a Kubelka-Munk method using uv-visible diffuse reflectance data Zn-doped GaN photocatalysts. The inset provides an expanded view of the spectra in the energy range of 2 to 4 eV
  • Figure 5. Representative absorbance spectra for specified time of uv-visible illumination of methylene blue (MB) and p-nitroaniline (p-NA) solutions in the absence (a, c) or presence (b, d) of 4% Zn-doped GaN photocatalysts
  • Figure 6. Relative concentration vs. time plots of MB decomposition in the presence of various photocatalysts under (a) uv-visible (b) visible light irradiation. Figure 6 (c) shows relative concentration changes of 4-NA under uv-visible irradiation
  • Figure 7. Rate constant as a function of surface area and shape