Effects of persulfate and hydrogen peroxide on oxidation of oxalate by pulsed corona discharge

Priit Tikker, Niina Dulova, Iakov Kornev, Sergei Preis

Research output: Contribution to journalArticlepeer-review

Abstract

Application of gas-phase pulsed corona discharge (PCD) to oxidation of aqueous pollutants shows unequalled energy efficiency among advanced oxidation processes (AOPs). Improved AOPs often activate extrinsic oxidants. Experimental research was undertaken into sodium persulfate and hydrogen peroxide activation by PCD in oxidation of 1.11 mM oxalate. Oxidant and target compound concentration ratios, pH, gas-liquid contact surface and pulse repetition frequency were studied as control parameters. Results implicated a beneficial effect at oxalate/persulfate molar ratios from 1:0.1 to 1:1 in acidic medium with the optimum at 1:0.5, moderate contact surface and lower frequency. However, the observed synergism of PCD/PS combination decreased with increasing the initial pH of the treated solution. Hydrogen peroxide exhibited negative or neutral impact in all media. Non-assisted PCD proved the most energy efficient approach towards water treatment at neutral and alkaline conditions.

Original languageEnglish
Article number128586
JournalChemical Engineering Journal
Volume411
DOIs
Publication statusPublished - 1 May 2021

Keywords

  • Activated persulfate
  • AOPs
  • Gas-liquid contact surface
  • Hydroxyl radicals
  • Oxalic acid
  • Plasma

ASJC Scopus subject areas

  • Chemistry(all)
  • Environmental Chemistry
  • Chemical Engineering(all)
  • Industrial and Manufacturing Engineering

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