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, Sergio GARCIA SEGURA, Rosa María Rodríguez, Enric Brillas, Mohamed Soussi El Begrani, Ben Ali Abdelouahid

Research output: Contribution to journalArticle

64 Citations (Scopus)

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

Fingerprint

Sulfanilic Acids
Oxamic Acid
Solar Energy
Electrolysis
Oxalates
Acids
Sunlight
Photolysis
acid
Ultraviolet Rays
Organic carbon
Ultraviolet radiation
Acetic Acid
Hydroxyl Radical
mineralization
Nitrogen
Carbon
Energy utilization
Air
Irradiation

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

Cite this

Optimization of the electro-Fenton and solar photoelectro-Fenton treatments of sulfanilic acid solutions using a pre-pilot flow plant by response surface methodology. / El-Ghenymy, Abdellatif; GARCIA SEGURA, Sergio; Rodríguez, Rosa María; Brillas, Enric; El Begrani, Mohamed Soussi; Abdelouahid, Ben Ali.

In: Journal of Hazardous Materials, Vol. 221-222, 30.06.2012, p. 288-297.

Research output: Contribution to journalArticle

El-Ghenymy, Abdellatif ; GARCIA SEGURA, Sergio ; Rodríguez, Rosa María ; Brillas, Enric ; El Begrani, Mohamed Soussi ; Abdelouahid, Ben Ali. / Optimization of the electro-Fenton and solar photoelectro-Fenton treatments of sulfanilic acid solutions using a pre-pilot flow plant by response surface methodology. In: Journal of Hazardous Materials. 2012 ; Vol. 221-222. pp. 288-297.
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AU - Rodríguez, Rosa María

AU - Brillas, Enric

AU - El Begrani, Mohamed Soussi

AU - Abdelouahid, Ben Ali

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