Degradation of diphenylamine by persulfate: Performance optimization, kinetics and mechanism

Shen Xin Li, Dong Wei, Nai Ki MAK, Zongwei CAI, Xiang Rong Xu, Hua Bin Li, Yue Jiang*

*Corresponding author for this work

Research output: Contribution to journalJournal articlepeer-review

93 Citations (Scopus)


The degradation of diphenylamine (DPA) in aqueous solution by persulfate is investigated. Effects of pH, persulfate concentration, ionic strength, temperature and catalytic ions Fe3+ and Ag+ on the degradation efficiency of DPA by persulfate are examined in batch experiments. The degradation of DPA by persulfate is found to follow the pseudo-first-order kinetic model. Increasing the reaction temperature or persulfate concentration may significantly accelerate the DPA degradation. Fe3+ and Ag+ ions can enhance the degradation of DPA, and Ag+ ion is more efficient than Fe3+ ion. However, the increase of either the pH value or ionic strength will decrease the rate of DPA degradation. N-Phenyl-4-quinoneimine, N-carboxyl-4-quinoneimine, 4-quinoneimine and oxalic acid are identified as the major intermediates of DPA degradation, and a primary pathway for the degradation of DPA is proposed. The degradation of DPA in surface water, groundwater and seawater is also tested by persulfate, and more than 90% of DPA can be degraded at room temperature in 45 min at an initial concentration of 20 mg L-1.

Original languageEnglish
Pages (from-to)26-31
Number of pages6
JournalJournal of Hazardous Materials
Issue number1
Publication statusPublished - 15 May 2009

Scopus Subject Areas

  • Environmental Engineering
  • Environmental Chemistry
  • Waste Management and Disposal
  • Pollution
  • Health, Toxicology and Mutagenesis

User-Defined Keywords

  • Degradation
  • Diphenylamine
  • Kinetics
  • Mechanism
  • Persulfate


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