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Phase I Reactions: Oxidation of Aliphatic and Aromatic Carbon-Containing Systems01:19

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Phase I biotransformation reactions are integral to drug metabolism, predominantly involving oxidative, reductive, and hydrolytic transformations. Chief among these are oxidative reactions, which enhance the hydrophilicity of xenobiotics and introduce polar functional groups to facilitate their elimination from the body.
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A comparative study on phenazone degradation by sulfate radicals based processes.

Han Gong1, Wei Chu2, Lu Gan3

  • 1Joint Laboratory of Guangdong Province and Hong Kong Region on Marine Bioresource Conservation and Exploitation, College of Marine Sciences, South China Agricultural University, Guangzhou, China.

Environmental Research
|August 23, 2020
PubMed
Summary

This study compared UVA/Fe(II)/persulfate (PS) and UVA/Fe(II)/peroxymonosulfate (PMS) for removing phenazone (PNZ). UVA/Fe(II)/PMS excelled at PNZ degradation, while UVA/Fe(II)/PS was superior for reducing toxicity.

Keywords:
PhenazonePhotodegradationSulfate radicalsToxicityTreatment

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Area of Science:

  • Environmental Chemistry
  • Advanced Oxidation Processes
  • Water Treatment

Background:

  • Emerging pollutants like phenazone (PNZ) pose risks to aquatic ecosystems.
  • Conventional water treatment methods are often insufficient for complete pollutant removal.
  • Advanced Oxidation Processes (AOPs) offer promising solutions for contaminant degradation.

Purpose of the Study:

  • To comparatively evaluate the efficiency of UVA/Fe(II)/persulfate (PS) and UVA/Fe(II)/peroxymonosulfate (PMS) for phenazone (PNZ) removal.
  • To investigate the degradation pathways, mineralization, and detoxification mechanisms of PNZ under different AOP conditions.
  • To identify the dominant radical species responsible for PNZ degradation in each process.

Main Methods:

  • Comparative study of two AOPs: UVA/Fe(II)/persulfate (PS) and UVA/Fe(II)/peroxymonosulfate (PMS).
  • Analysis of phenazone (PNZ) degradation kinetics, mineralization (TOC removal), and intermediate products.
  • Identification of dominant radical species (sulfate and hydroxyl radicals) using scavenging studies.
  • Toxicity assessment of treated water samples.

Main Results:

  • Both UVA/Fe(II)/PS and UVA/Fe(II)/PMS demonstrated high efficiency in PNZ degradation and reasonable mineralization.
  • UVA/Fe(II)/PMS showed higher PNZ degradation rates due to greater radical generation.
  • UVA/Fe(II)/PS exhibited a higher TOC removal per unit of PNZ decay and faster toxicity elimination.
  • Sulfate and hydroxyl radicals were identified as the dominant species in UVA/Fe(II)/PS and UVA/Fe(II)/PMS, respectively.
  • Six novel intermediates were identified during PNZ degradation.

Conclusions:

  • UVA/Fe(II)/PMS is more effective for the degradation of phenazone (PNZ).
  • UVA/Fe(II)/PS is more efficient for the detoxification of PNZ and exhibits better mineralization.
  • Both AOPs show significant potential for the removal and detoxification of emerging contaminants like PNZ.