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<p>In the present study, α-Bi<sub>2</sub>O<sub>3</sub> was doped with a series of nickel concentrations (0.05&#xa0;M, 0.10&#xa0;M, 0.15&#xa0;M, 0.20&#xa0;M, and 0.25&#xa0;M) manufactured by a simple co-precipitation method. The XRD analysis was confirmed by JCPDS card no. 00–041-1449, and the crystallite size was found to be 64.02&#xa0;nm, 54.45&#xa0;nm, 48.64&#xa0;nm, 42.94&#xa0;nm, 46.54&#xa0;nm, and 53.48&#xa0;nm. FT-IR analysis confirmed the presence of functional groups. The addition of Ni dopant showed the effective incorporation of Ni into the framework of α-Bi<sub>2</sub>O<sub>3</sub>, which decreases the crystallite size. Morphological evaluation by FE-SEM reveals a flake-like structure for pure α-Bi<sub>2</sub>O<sub>3</sub> and an agglomerated flake-like shape for Ni-doped α-Bi<sub>2</sub>O<sub>3</sub>. EDX analysis confirmed the presence of pure and Ni-doping α-Bi<sub>2</sub>O<sub>3</sub> without any additional impurities. The HR-TEM images showed the existence of smaller nanoparticles of 10–20&#xa0;nm. The optical properties and photocatalytic degradation performance were analyzed by UV–Visible and PL studies. The UV analysis showed the red shift in the absorbance wavelength for Ni doping α-Bi<sub>2</sub>O<sub>3</sub> which designates a decrease in band gap energy. PL studies showed that a bluish-green emission band is noticed at 466&#xa0;nm in the visible region, and the intensities of the PL emission peak gradually decrease with the addition of Ni concentration. Finally, the superior photocatalytic degradation efficiency of methylene blue has reached 0.15&#xa0;M concentration after 135&#xa0;min under UV–Visible light irradiation with 91%. The charge separation of photogenerated electron–hole pairs, which is induced by nickel-doping α-Bi<sub>2</sub>O<sub>3</sub>, is presented in this report.</p>

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Impregnation of Ni2+ on α-Bi2O3 for their structural, morphological, optical, and photocatalytic efficiency on methylene blue dye

  • 期刊论文

  • 发表日期：

    2025年10月10日

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  • K. Kombaiah,
  • P. Kannan,
  • J. Judith Vijaya,
  • G. Viruthagiri

摘要

In the present study, α-Bi2O3 was doped with a series of nickel concentrations (0.05 M, 0.10 M, 0.15 M, 0.20 M, and 0.25 M) manufactured by a simple co-precipitation method. The XRD analysis was confirmed by JCPDS card no. 00–041-1449, and the crystallite size was found to be 64.02 nm, 54.45 nm, 48.64 nm, 42.94 nm, 46.54 nm, and 53.48 nm. FT-IR analysis confirmed the presence of functional groups. The addition of Ni dopant showed the effective incorporation of Ni into the framework of α-Bi2O3, which decreases the crystallite size. Morphological evaluation by FE-SEM reveals a flake-like structure for pure α-Bi2O3 and an agglomerated flake-like shape for Ni-doped α-Bi2O3. EDX analysis confirmed the presence of pure and Ni-doping α-Bi2O3 without any additional impurities. The HR-TEM images showed the existence of smaller nanoparticles of 10–20 nm. The optical properties and photocatalytic degradation performance were analyzed by UV–Visible and PL studies. The UV analysis showed the red shift in the absorbance wavelength for Ni doping α-Bi2O3 which designates a decrease in band gap energy. PL studies showed that a bluish-green emission band is noticed at 466 nm in the visible region, and the intensities of the PL emission peak gradually decrease with the addition of Ni concentration. Finally, the superior photocatalytic degradation efficiency of methylene blue has reached 0.15 M concentration after 135 min under UV–Visible light irradiation with 91%. The charge separation of photogenerated electron–hole pairs, which is induced by nickel-doping α-Bi2O3, is presented in this report.