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The semiconductor photocatalyst ZnO was synthesized by direct precipitation method using the commercially available analytical grade reagent zinc nitrate and potassium hydroxide. The obtained white ZnO was characterized by powder XRD, TEM, FE-SEM/EDX, to understand the crystallinity, size of the particle and surface phenomena with the elemental composition. The average size of the particle was evaluated to be 138 ± 6 nm. The lower band gap 3.02 eV of the synthesized precursor ZnO was found to the beneficial for the degradation of the toxic organic dye methyl red (MR) due to the transition of the photo-generated electron(s) to the CB from the VB, frequently used as indicator for the acid base reaction. The experimental results suggested the 1 g/L dose of the synthesized precursor can efficient to degrade the ~ 97% of MR within 6 h of photo-irradiation (254 nm, 18 W) with an initial concentration of 55 mg/L. Proposed mechanism suggested during transition of photo-generated high energetic electron(s) to the CB from (electron hole), on the semiconducting surfaces finally, produces different ROS, causing the dye degradation. Again, it may also be possible due to transition of electron(s) from HOMO to LUMO of MR and finally mineralized due to the redox reaction(s). Kinetically, it followed the first-order reaction model. The degradation of the dye was tried to proof with the addition of free radical quencher (ROS) methyl acrylate.

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Synthesis, Characterization and Photocatalytic Activity of Zn(II) Oxide Nanomaterials on Methyl Red

  • 会议论文

  • 发表日期：

    2025年

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  • Kapilas Das,
  • Saismrutiranjan Mohanty,
  • Soumya Dash,
  • Namrata Pradhan,
  • Sanjib Moulick,
  • Sanjoy Kumar Maji

摘要

The semiconductor photocatalyst ZnO was synthesized by direct precipitation method using the commercially available analytical grade reagent zinc nitrate and potassium hydroxide. The obtained white ZnO was characterized by powder XRD, TEM, FE-SEM/EDX, to understand the crystallinity, size of the particle and surface phenomena with the elemental composition. The average size of the particle was evaluated to be 138 ± 6 nm. The lower band gap 3.02 eV of the synthesized precursor ZnO was found to the beneficial for the degradation of the toxic organic dye methyl red (MR) due to the transition of the photo-generated electron(s) to the CB from the VB, frequently used as indicator for the acid base reaction. The experimental results suggested the 1 g/L dose of the synthesized precursor can efficient to degrade the ~ 97% of MR within 6 h of photo-irradiation (254 nm, 18 W) with an initial concentration of 55 mg/L. Proposed mechanism suggested during transition of photo-generated high energetic electron(s) to the CB from (electron hole), on the semiconducting surfaces finally, produces different ROS, causing the dye degradation. Again, it may also be possible due to transition of electron(s) from HOMO to LUMO of MR and finally mineralized due to the redox reaction(s). Kinetically, it followed the first-order reaction model. The degradation of the dye was tried to proof with the addition of free radical quencher (ROS) methyl acrylate.