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Related Concept Videos

Oxygenic Photosynthesis01:26

Oxygenic Photosynthesis

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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...
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Anoxygenic Photosynthesis01:30

Anoxygenic Photosynthesis

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Anoxygenic photosynthesis is a phototrophic process that captures light energy to drive carbon fixation without producing molecular oxygen. Unlike oxygenic photosynthesis, which utilizes water as an electron donor and releases oxygen, anoxygenic phototrophs use alternative electron donors such as hydrogen sulfide (H₂S), elemental sulfur (S⁰), or thiosulfate (S₂O₃²⁻). This process is carried out by diverse groups of bacteria, including purple bacteria, green...
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Photosystem II01:22

Photosystem II

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The multi-protein complex photosystem II (PS II) harvests photons and transfers their energy through its bound pigments to its reaction center, and ultimately to photosystem I (PSI) through the electron transport chain. The pigments responsible for caputirng the light energy in photosystems include chlorophyll a, chlorophyll b, and carotenoids.
The pigment molecules are arranged across  two photosystem domains — the antenna complex and the reaction center. The main aim of the pigment...
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Photosystem I01:27

Photosystem I

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Although structurally similar to photosystem II (PSII), photosystem I (PSI) is has a different electron supplier and electron acceptor.
Both these photosystems work in concert. An excited electron from PSII is relayed to PSI via an electron transport chain in the thylakoid membrane of the chloroplast, which is comprised of the carrier molecule plastoquinone, the dual-protein cytochrome complex, and plastocyanin. As electrons move between PSII and PSI, they lose energy and must be re-energized...
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Photosystems01:32

Photosystems

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Photosystems are multiprotein complexes that form the functional units of photosynthesis in plants, algae, and cyanobacteria. They are found embedded in the membrane of tiny sac-like structures called thylakoids placed inside the chloroplast.
Functioning of Photosystems
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The Z-Scheme of Electron Transport in Photosynthesis01:34

The Z-Scheme of Electron Transport in Photosynthesis

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The light reactions of photosynthesis assume a linear flow of electrons from water to NADP+. During this process, light energy drives the splitting of water molecules to produce oxygen. However, oxidation of water molecules is a thermodynamically unfavorable reaction and requires a strong oxidizing agent. This is accomplished by the first product of light reactions: oxidized P680 (or P680+), the most powerful oxidizing agent known in biology. The oxidized P680 that acquires an electron from the...
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Developing Photosensitizer-Cobaloxime Hybrids for Solar-Driven H2 Production in Aqueous Aerobic Conditions
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Diatom-Inspired Design: A New Ru-Based Photosystem for Efficient Oxygen Evolution.

Ambra Maria Cancelliere1,2, Rosalia Maria Cigala1, Mario Samperi3

  • 1Department of Chemical, Biological, Pharmaceutical and Environmental Science, University of Messina, Via F. Stagno d'Alcontres 31, 98166 Messina, Italy.

Materials (Basel, Switzerland)
|January 10, 2026
PubMed
Summary

This study developed a novel composite photocatalyst by attaching a photosensitizer and catalyst to diatomaceous earth. This new material demonstrates enhanced reactivity and recyclability for efficient oxygen evolution reactions.

Keywords:
composite materialcovalent graftingdiatomaceous earthheterogeneous catalysisphotocatalysisruthenium complex

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Area of Science:

  • Materials Science
  • Photochemistry
  • Catalysis

Background:

  • Homogeneous catalysts face separation and recovery challenges.
  • Heterogeneous systems offer potential solutions for catalyst reusability.
  • Developing efficient and recyclable catalysts is crucial in modern chemistry.

Purpose of the Study:

  • To synthesize and characterize a novel composite photocatalyst (PS/Cat@DE).
  • To investigate the photocatalytic performance of the composite material for oxygen evolution.
  • To evaluate the role of diatomaceous earth in enhancing catalyst reactivity and stability.

Main Methods:

  • Synthesis of Ru(bpy)2(bda)-Ru(bda)(cp)2@DE (PS/Cat@DE) composite.
  • Characterization using UV-Vis, FTIR, SEM, and EDS.
  • Photocatalytic experiments measuring oxygen evolution.

Main Results:

  • The PS/Cat@DE composite exhibited significantly higher photocatalytic activity than individual components.
  • Diatomaceous earth (DE) played a crucial role in promoting oxygen evolution.
  • Covalent attachment to DE potentially enhanced reactivity and reduced degradation.

Conclusions:

  • The novel PS/Cat@DE composite is an efficient and recyclable photocatalyst.
  • Diatomaceous earth enhances photocatalytic performance for oxygen evolution.
  • This approach offers a promising strategy for developing advanced heterogeneous catalysts.