Sonophotocatalytic mineralization of antipyrine in aqueous solution

• Published in: Applied catalysis. B, Environmental Vol. 138-139; pp. 318 - 325
• Main Authors: Durán, A., Monteagudo, J.M., Sanmartín, I., García-Díaz, A.
• Format: Journal Article
• Language: English
• Published: Kidlington Elsevier B.V 17.07.2013; Elsevier
• Subjects: Aqueous solutions; Bonding; Butanedioic acid; Catalysis; Chemistry; Cleavage; Contaminants; Emerging contaminant; Exact sciences and technology; General and physical chemistry; Iron; Mineralization; Neural networks; Pharmaceuticals; Phenyls; Photochemistry; Physical chemistry of induced reactions (with radiations, particles and ultrasonics); Radicals; Rate constants; Theory of reactions, general kinetics. Catalysis. Nomenclature, chemical documentation, computer chemistry; TOC; Ultrasonic chemistry; Ultrasound; UV radiation; UV radiation; UV; km; NNs; Emerging contaminant; ECs; WWTPs; TOC; US EPA; Ultrasound; US; Pharmaceuticals; Sonophotocatalysis; Sonochemistry; Photocatalysis; Mineralization; Homogeneous catalysis; Aqueous solution; Contaminant; Environmental protection
• ISSN: 0926-3373; 1873-3883
• DOI: 10.1016/j.apcatb.2013.03.013

•The UV/H2O2/Fe/US process is an alternative for mineralization of antipyrine.•92% of TOC is removed after 50min.•Antipyirine photodegradation proceeds mainly through a radical mechanism.•Important synergistic effect (45.3%) between sonolysis and photoFenton. The mineralization of aqueous solutions of antipyrine, an emerging contaminant, using an innovative homogeneous sono-photocatalytic oxidation process (H2O2/UV/Fe/Ultrasound) was evaluated in an artificial UV lamp. At the selected operation conditions [H2O2]=1500ppm, pH=2.7, amplitude=100%, pulse length (cycles)=0.3 during 15min and then 1, 92% of TOC is removed after 50min treating an aqueous solution containing 50ppm of antipyrine. An important synergistic effect between sonolysis and photoFenton (UV/H2O2/Fe) of 45.4% was quantified using the first order rate constants for TOC. Comparison experiments of scavenger-loaded conditions demonstrate that the antipyirine photodegradation proceeds mainly through a radical mechanism probably beginning by the cleavage of the NN bond of penta heterocycle leading to the formation of aromatic acids (anthranilic and 1,4-benzenedicarboxylic acids) then followed by the opening of phenyl ring to form small molecular organic acids (mainly 2-butenedioic, 4-oxo-pentanoic and butanedioic acids), which may be decomposed further into CO2.