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Related Concept Videos

The Z-Scheme of Electron Transport in Photosynthesis01:34

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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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Related Experiment Video

Updated: Mar 29, 2026

Visible-light Induced Reduction of Graphene Oxide Using Plasmonic Nanoparticle
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Reduced Graphene Oxide-Ag3PO4 Heterostructure: A Direct Z-Scheme Photocatalyst for Augmented Photoreactivity and

Alaka Samal1,2, D P Das3,4, K K Nanda1,2

  • 1Academy of Scientific and Innovative Research, New Delhi, India.

Chemistry, an Asian Journal
|December 8, 2015
PubMed
Summary

A novel reduced graphene oxide-silver phosphate (RGO-Ag3PO4) composite efficiently degrades organic dyes and produces hydrogen fuel under visible light. This Z-scheme heterostructure shows high performance and reusability.

Keywords:
RGO-Ag3PO4 heterostructureZ-scheme heterostructureselectrochemical impedance spectroscopyhydrogen generationphotocatalysisphotomineralization of dyes

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Area of Science:

  • Materials Science
  • Photocatalysis
  • Green Chemistry

Background:

  • Developing efficient visible-light-driven photocatalysts is crucial for environmental remediation and clean energy production.
  • Graphene-based heterostructures offer unique electronic and surface properties for enhanced photocatalytic performance.

Purpose of the Study:

  • To synthesize a direct Z-scheme reduced graphene oxide-silver phosphate (RGO-Ag3PO4) heterostructure.
  • To investigate the effect of RGO content on photocatalytic activity for dye mineralization and hydrogen production.
  • To elucidate the reactive species involved in the photocatalytic process.

Main Methods:

  • One-pot photoreduction synthesis of RGO-Ag3PO4 heterostructures under visible light.
  • Characterization of textural properties and photocatalytic activity.
  • Total organic carbon (TOC) analysis for dye mineralization efficiency.
  • Quenching studies to identify reactive oxygen species and holes.
  • Hydrogen evolution rate measurements.

Main Results:

  • Simultaneous reduction of graphene oxide (GO) and growth of Ag3PO4.
  • Achieved 97.1% mineralization of organic dyes in 5 minutes using RGO-Ag3PO4.
  • Identified hydroxyl radicals, superoxide radicals, and holes as key reactive species.
  • Demonstrated high hydrogen evolution rate (3690 μmol h⁻¹ g⁻¹) with excellent reusability.
  • The 4% RGO-Ag3PO4 composite showed a 6.15-fold increase in H2 evolution compared to RGO alone.

Conclusions:

  • The RGO-Ag3PO4 heterostructure is a highly efficient visible-light photocatalyst for organic dye degradation and hydrogen fuel generation.
  • The Z-scheme architecture facilitates charge transfer, enhancing photocatalytic activity.
  • The material exhibits excellent stability and reusability, making it promising for practical applications.