Optimization of the electro-Fenton and solar photoelectro-Fenton treatments of sulfanilic acid solutions using a pre-pilot flow plant by response surface methodology

Abdellatif El-Ghenymy, Sergi Garcia-Segura, Rosa María Rodríguez, Enric Brillas, Mohamed Soussi El Begrani, Ben Ali Abdelouahid

Research output: Contribution to journalArticle

70 Scopus citations

Abstract

A central composite rotatable design and response surface methodology were used to optimize the experimental variables of the electro-Fenton (EF) and solar photoelectro-Fenton (SPEF) degradations of 2.5L of sulfanilic acid solutions in 0.05M Na 2SO 4. Electrolyses were performed with a pre-pilot flow plant containing a Pt/air diffusion reactor generating H 2O 2. In SPEF, it was coupled with a solar photoreactor under an UV irradiation intensity of ca. 31Wm -2. Optimum variables of 100mAcm -2, 0.5mM Fe 2+ and pH 4.0 were determined after 240min of EF and 120min of SPEF. Under these conditions, EF gave 47% of mineralization, whereas SPEF was much more powerful yielding 76% mineralization with 275kWhkg -1 total organic carbon (TOC) energy consumption and 52% current efficiency. Sulfanilic acid decayed at similar rate in both treatments following a pseudo-first-order kinetics. The final solution treated by EF contained a stable mixture of tartaric, acetic, oxalic and oxamic acids, which form Fe(III) complexes that are not attacked by hydroxyl radicals formed from H 2O 2 and added Fe 2+. The quick photolysis of these complexes by UV light of sunlight explains the higher oxidation power of SPEF. NH 4 + was the main inorganic nitrogen ion released in both processes.

Original languageEnglish (US)
Pages (from-to)288-297
Number of pages10
JournalJournal of Hazardous Materials
Volume221-222
DOIs
StatePublished - Jun 30 2012
Externally publishedYes

Keywords

  • Central composite rotatable design
  • Electro-Fenton
  • Response surface methodology
  • Solar photoelectro-Fenton
  • Sulfanilic acid

ASJC Scopus subject areas

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

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