Scholarlink

<p>α-MoO<sub>3</sub> was identified by X-ray diffraction (XRD) and the pattern revealed a single phase in the orthorhombic system (<i>SG</i>: Pbnm). Three strong vibrations at 439, 806 and 977 cm<sup>−1</sup> in the FT-IR spectrum are associated to the elongation mode of Mo–O, Mo–O-Mo and Mo = O bonds. MoO<sub>3</sub> with a light blue color absorbs in the visible region with a gap (E<sub>g</sub>) of 2.77 eV. It corresponds to the electrons transition from the valence band formed by (O<sub>2</sub>: <i>2p</i>) to the conduction band deriving from Mo<sup>6+</sup>:<i>4d orbital</i>. A further electronic transition of 1 eV, corresponds to the internal transfer of charges between Mo<sup>6+</sup>/Mo<sup>5+</sup>. The linearization of the Arrhenius equation: log σ as a function of 10<sup>3</sup>/T indicated a semiconductor behavior of MoO<sub>3</sub> with an activation energy of 0.036 eV. The variation of the thermoelectric power (S) of MoO<sub>3</sub>, in the temperature range studied, indicated an <i>n</i>-type behavior with electrons as majority of carriers. The extrapolation of the fitted line to infinite capacity (C<sup>−2</sup> = 0) yielded a flat band potential (E<sub>fb</sub>) of 0.29 V<sub>SCE</sub>. The photoactivity of MoO<sub>3</sub> was studied by varying different parameters under visible light: the dose of MoO<sub>3</sub>, the initial concentration of EOS, pH of working medium and light intensity. The optimal conditions: 0.7 mg/mL of MoO<sub>3</sub>/E0S with intensity of 8.5 mW cm<sup>−2</sup> at pH ~ 4 allowed to obtain a photocatalytic oxidation efficiency of 53%.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

RETRACTED ARTICLE: Physical characterizations of nano-particles α-MoO3: Eosin degradation under visible light

  • 期刊论文

  • 发表日期：

    2025年3月4日

查看全文
  • Nesrine Koriche,
  • Razika Brahimi,
  • Mohamed Trari

摘要

α-MoO3 was identified by X-ray diffraction (XRD) and the pattern revealed a single phase in the orthorhombic system (SG: Pbnm). Three strong vibrations at 439, 806 and 977 cm−1 in the FT-IR spectrum are associated to the elongation mode of Mo–O, Mo–O-Mo and Mo = O bonds. MoO3 with a light blue color absorbs in the visible region with a gap (Eg) of 2.77 eV. It corresponds to the electrons transition from the valence band formed by (O2: 2p) to the conduction band deriving from Mo6+:4d orbital. A further electronic transition of 1 eV, corresponds to the internal transfer of charges between Mo6+/Mo5+. The linearization of the Arrhenius equation: log σ as a function of 103/T indicated a semiconductor behavior of MoO3 with an activation energy of 0.036 eV. The variation of the thermoelectric power (S) of MoO3, in the temperature range studied, indicated an n-type behavior with electrons as majority of carriers. The extrapolation of the fitted line to infinite capacity (C−2 = 0) yielded a flat band potential (Efb) of 0.29 VSCE. The photoactivity of MoO3 was studied by varying different parameters under visible light: the dose of MoO3, the initial concentration of EOS, pH of working medium and light intensity. The optimal conditions: 0.7 mg/mL of MoO3/E0S with intensity of 8.5 mW cm−2 at pH ~ 4 allowed to obtain a photocatalytic oxidation efficiency of 53%.