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Oxygenic Photosynthesis

Oxygenic photosynthesis is a fundamental process in which light energy is harnessed to drive the oxidation of water, leading to the production of molecular oxygen (O₂), adenosine triphosphate (ATP), and nicotinamide adenine dinucleotide phosphate (NADPH). This process is essential for sustaining aerobic life on Earth and is primarily carried out by cyanobacteria, algae, and plants. The core of oxygenic photosynthesis lies in the thylakoid membranes, where chlorophyll pigments facilitate light...
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Developing Photosensitizer-Cobaloxime Hybrids for Solar-Driven H2 Production in Aqueous Aerobic Conditions
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Ni-Modified Defect-Engineered NH2-UiO-66 for Efficient H2O2 Photosynthesis Coupled with Benzyl Alcohol Oxidation.

Yuan Chang1, Zhenzi Li1, Xuepeng Wang1

  • 1School of Chemistry and Chemical Engineering, Qilu University of Technology (Shandong Academy of Sciences), Jinan 250353, China.

Nanomaterials (Basel, Switzerland)
|May 26, 2026
PubMed
Summary

This study developed novel Ni-modified defect-engineered NH2-UiO-66 photocatalysts for efficient hydrogen peroxide (H2O2) production and benzyl alcohol oxidation. The engineered material significantly improved charge carrier separation and transfer, leading to high H2O2 yields.

Keywords:
NH2-UiO-66Ni modificationdefect engineeringhydrogen peroxidephotocatalysis

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Area of Science:

  • Materials Science
  • Photocatalysis
  • Green Chemistry

Background:

  • Simultaneous production of hydrogen peroxide (H2O2) and selective organic oxidation using photocatalysis is a key challenge.
  • Metal-organic frameworks (MOFs) offer tunable properties but require optimization for enhanced performance.

Purpose of the Study:

  • To develop and characterize Ni-modified defect-engineered NH2-UiO-66 (Ni/UN) photocatalysts.
  • To investigate the photocatalytic performance of Ni/UN for H2O2 production and benzyl alcohol oxidation.
  • To elucidate the mechanism of H2O2 formation and the role of oxygen.

Main Methods:

  • Synthesis of defect-engineered NH2-UiO-66 (UN) via vacuum treatment.
  • Modification of UN with Ni species to form Ni/UN photocatalysts.
  • Characterization using photoluminescence, photocurrent response, electrochemical impedance, and band structure analysis.
  • Evaluation of photocatalytic activity in benzyl alcohol oxidation and H2O2 production under varying atmospheric conditions.
  • Scavenger experiments to determine reaction mechanisms.

Main Results:

  • Ni/UN exhibited improved charge carrier separation and transfer, evidenced by reduced photoluminescence, enhanced photocurrent, and lower impedance.
  • Ni/UN demonstrated a narrow band gap (2.52 eV) and a favorable conduction band position (-0.50 V) for reduction reactions.
  • The highest H2O2 production rate reached 3257 μmol g-1 h-1 with simultaneous benzaldehyde generation (3420 μmol g-1).
  • Scavenger studies indicated that photogenerated electrons and oxygen-derived active species are crucial for H2O2 formation, with limited contribution from ·OH radicals.

Conclusions:

  • Defect engineering and Ni-metal coordination effectively enhance the performance of MOF-based photocatalysts.
  • Ni/UN is a highly efficient photocatalyst for simultaneous H2O2 production and selective benzyl alcohol oxidation.
  • The strategy provides a pathway for developing advanced MOF materials for sustainable chemical synthesis.