Comparison on efficiency of electrochemical phenol oxidation in two different supporting electrolytes (NaCl and Na 2 SO 4 ) using Pt/Ti electrode

Johanna Zambrano, Booki Min

Research output: Contribution to journalArticlepeer-review

19 Citations (Scopus)

Abstract

The electrochemical oxidation of phenol was evaluated with two different electrolytes using a Pt/Ti anode electrode in a single-chambered reactor. The bulk electrolysis was conducted at a fixed current density of 9.6 mA cm −2 , and the average applied potential difference was 6 V (anode potential 4 V; cathode potential -2 V). The feasibility of electrochemical treatment of phenol contaminated water was determined in terms of phenol degradation rate, byproduct formation, pH stability, and current efficiency. Galvanostatic electrolysis with NaCl electrolyte removed phenol and chemical oxygen demand (COD) faster than with Na 2 SO 4 electrolyte, possibly due to the formation of chloride–oxychloride radicals, which are strong oxidation agents. The phenol and COD removal rates with NaCl were 2.26 × 10 −2 and 3.00 × 10 −4 min −1 , which was 9.5 and 1.5 times higher respectively than with Na 2 SO 4 . Energy consumption and current efficiency during the electrolysis suggested that chloride ions hinder the oxygen-evolution reaction, causing a growth in current efficiency and a decrease in energy consumption. This result clearly indicated that the presence of chloride in the solution was an important parameter for the efficient electrochemical oxidation of phenol-contaminated water.

Original languageEnglish
Article number100382
JournalEnvironmental Technology and Innovation
Volume15
DOIs
Publication statusPublished - Aug 2019

Keywords

  • Chloride
  • Electrochemical oxidation
  • Electrolytes
  • Phenol
  • Pt/Ti electrode
  • Sulfate

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