Abstract

The photo-degradation of the emerging contaminant antipyrine (AP) was studied and optimized in a novel photocatalytic spinning disc reactor (SDR). A heterogeneous process (UV/H2O2/TiO2) was used. TiO2 was immobilized on the surface of a glass disc using a sol-gel method. A factorial design of experiments followed by a Neural Networks fitting allowed the optimal conditions to be determined for treating 50 mg/L of AP. Under these conditions (pH= 4; [H2O2]0= 1500 mg/L; disc speed= 500 rpm; flowrate = 25 mL/s), AP was completely degraded in 120 minutes and regeneration of the disc allowed 10 cycles with no loss in efficiency. The value of the apparent volumetric rate constant was found to be 6.9•10-4 s-1 with no apparent mass transfer limitation.

Based on the main intermediates identified, a mechanism is proposed for antipyrine photodegradation: Firstly, cleavage of the N-N bond of penta-heterocycle leads to the formation of two aromatic acids and N-phenylpropanamide. An attack to the C-N bond in the latter compound produces benzenamine. Finally, the phenyl ring of the aromatic intermediates are opened and molecular organic acids are formed.
Original languageEnglish
Pages (from-to)504-512
Number of pages9
JournalJournal of Environmental Management
Volume187
Early online date14 Nov 2016
DOIs
Publication statusPublished - 1 Feb 2017

Keywords

  • AOPs
  • emerging contaminant
  • neural networks
  • UV radiation
  • pharmaceuticals
  • pathway

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Chemical Engineering (miscellaneous)
  • Catalysis
  • Fluid Flow and Transfer Processes
  • Environmental Engineering
  • Waste Management and Disposal
  • Water Science and Technology
  • Pollution

Fingerprint Dive into the research topics of 'Antipyrine removal by TiO<sub>2</sub> photocatalysis based on spinning disc reactor technology'. Together they form a unique fingerprint.

  • Projects

    Spinning Mesh Disc Reactors

    Patterson, D.

    European Commission

    1/04/1331/03/17

    Project: EU Commission

  • Equipment

  • Cite this