Scholarlink

<p>A ZnO/MgO nanostructured composite was prepared through the thermal degradation of a mixed zinc oxalate/magnesium oxalate precursor. The obtained ZnO/MgO has been characterized using thermal gravimetric analysis (TGA), scanning electron microscopy (SEM), X-ray diffraction (XRD), and Fourier transform infrared spectroscopy (FTIR). The XRD reveals a crystalline structure with a crystal size of 33&#xa0;nm. The TGA confirmed the purity and stability of ZnO/MgO NPs at high temperatures. The ZnO/MgO NPs served as an efficient heterogeneous catalyst for the solvent-free, room-temperature Knoevenagel-Michael domino assembly of a library of 2-amino-4<i>H</i>-chromenes. The designed catalyst offers short reaction times (8–12&#xa0;min), excellent yields (91–99%), easy recovery and reuse for at least 4 cycles without a noticeable drop in efficacy, and maintains good performance in scale-up experiments. Furthermore, the composite exhibited promising photocatalytic activity, achieving 96.36% removal of methyl orange dye (5.0 ppm) under solar irradiation within 30&#xa0;min, outperforming pure MgO (3.64%) and ZnO (18.18%). Comprehensive post-reaction characterization reveals that ZnO/MgO retains its structural and chemical integrity following both heterogeneous organic catalysis and photocatalytic dye degradation. These findings indicate that ZnO/MgO exhibits promising catalytic and photocatalytic performance under the investigated conditions.</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

Bifunctional recyclable ZnO/MgO nanocomposite: solvent-free synthesis of chromenes and efficient water remediation

  • 期刊论文

  • 出版模式：

    开放获取

  • 发表日期：

    2026年5月7日

查看全文
  • Wael A. A. Arafa,
  • AbdElAziz A. Nayl,
  • Ahmed H. Alanazi,
  • Ismail M. Ahmed,
  • Adel A. Abdelwahab,
  • Hamada Mohamed Ibrahim,
  • Stefan Bräse,
  • Amr Mohammad Nassar

摘要

A ZnO/MgO nanostructured composite was prepared through the thermal degradation of a mixed zinc oxalate/magnesium oxalate precursor. The obtained ZnO/MgO has been characterized using thermal gravimetric analysis (TGA), scanning electron microscopy (SEM), X-ray diffraction (XRD), and Fourier transform infrared spectroscopy (FTIR). The XRD reveals a crystalline structure with a crystal size of 33 nm. The TGA confirmed the purity and stability of ZnO/MgO NPs at high temperatures. The ZnO/MgO NPs served as an efficient heterogeneous catalyst for the solvent-free, room-temperature Knoevenagel-Michael domino assembly of a library of 2-amino-4H-chromenes. The designed catalyst offers short reaction times (8–12 min), excellent yields (91–99%), easy recovery and reuse for at least 4 cycles without a noticeable drop in efficacy, and maintains good performance in scale-up experiments. Furthermore, the composite exhibited promising photocatalytic activity, achieving 96.36% removal of methyl orange dye (5.0 ppm) under solar irradiation within 30 min, outperforming pure MgO (3.64%) and ZnO (18.18%). Comprehensive post-reaction characterization reveals that ZnO/MgO retains its structural and chemical integrity following both heterogeneous organic catalysis and photocatalytic dye degradation. These findings indicate that ZnO/MgO exhibits promising catalytic and photocatalytic performance under the investigated conditions.