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Radical Autoxidation01:20

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The oxidation of an organic compound in the presence of air or oxygen is called autoxidation. For example, cumene reacts with oxygen to form hydroperoxide. Autoxidation involves initiation, propagation, and termination steps. Many organic compounds are susceptible to autoxidation—especially ethers in the presence of oxygen, which form hydroperoxides. Even though this reaction is slow, old ether bottles contain small amounts of peroxide, which leads to laboratory explosions during ether...
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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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In this lesson, the oxidation of alcohols is discussed in depth. The various reagents used for oxidation of primary and secondary alcohols are detailed, and their mechanism of action is provided.
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Is Singlet Oxygen an Important Oxidant in Advanced Oxidation Processes?

Shikha Garg1, T David Waite1

  • 1Water Research Centre, School of Civil and Environmental Engineering, The University of New South Wales, Sydney, NSW 2052, Australia.

Environmental Science & Technology
|December 5, 2025
PubMed
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Advanced Oxidation Processes (AOPs) are explored for water treatment, focusing on singlet oxygen (¹O₂) and superoxide (O₂•⁻) over hydroxyl radicals (•OH). This review addresses quantification challenges to improve AOP effectiveness.

Keywords:
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Area of Science:

  • Environmental Chemistry
  • Water Treatment Technologies
  • Oxidation Processes

Background:

  • Advanced Oxidation Processes (AOPs) are crucial for degrading persistent environmental contaminants.
  • Traditional AOPs primarily use hydroxyl radicals (•OH), but alternative species are gaining attention.
  • Singlet oxygen (¹O₂) and superoxide (O₂•⁻) offer selective reactivity and reduced matrix interference compared to •OH.

Purpose of the Study:

  • To critically review the reactivity of ¹O₂ and O₂•⁻ for organic contaminant oxidation.
  • To identify and discuss common pitfalls in quantifying ¹O₂ and O₂•⁻.
  • To provide a framework for accurate assessment and development of robust AOPs.

Main Methods:

  • Literature review of AOPs focusing on ¹O₂ and O₂•⁻.
  • Analysis of contaminant degradation pathways involving these species.
  • Evaluation of quantification techniques and their limitations.

Main Results:

  • ¹O₂ and O₂•⁻ show potential for oxidizing various organic contaminants.
  • Quantification methods for ¹O₂ and O₂•⁻ are prone to misinterpretation.
  • Methodological challenges can lead to inaccurate assessments of reactive species' roles.

Conclusions:

  • Accurate quantification of ¹O₂ and O₂•⁻ is essential for effective AOP development.
  • Addressing methodological pitfalls will enhance the reliability of AOP research.
  • Improved understanding supports the design of superior water treatment strategies using alternative reactive species.